Despatch LFD2-24-3 Owner's Manual

P/N 116096
REV. 9/97
C-147
'CLASSIC™ LFD SERIES
WITH PROTOCOL"
INSTRUCTION MANUAL
LFD Series Despatch Ovens are bench ovens to 343°C (650°F) with forced convection
airflow.
Model Volts Heater watts Amps HZ* Phase
LFD 1-42 240 | 6,000 28.7 50/60 1
LFD 2-11 208 12,000 39.7 60 3
| 240 12,000 34.9 60 3
480 12,000 17.5 60 3
LFD 2-24 208 24 000 76.2 60 3
240 24 000 66.8 60 3
480 24,000 334 60 3
* A kit is required for 240V-1Ph-50Hz operation. Units will operate on a 220V - 1
phase - 50 Hz line. Units are modified for 3-phase 50 Hz operation.
Prepared by:
Despatch Industries
P.O. Box 1320
Minneapolis, MN 55440-1320
Customer Service 800-473-7373
Thank you for choosing Despatch Industries. We appreciate
the opportunity to work with you and to meet your heat
processing needs. We believe that you have selected the
finest equipment available in the heat processing industry.
At Despatch, our service does not end after the purchase
and delivery of our equipment. For this reason we have
created the Service Products Division within Despatch. The
Service Products Division features our Response Center for
customer service. The Response Center will direct and
track your service call to ensure satisfaction.
Whenever you need service or replacement parts, contact
the Response Center at 1-800-473-7373: FAX 612-781-
5353.
Thank you for choosing Despatch.
Sincerely,
Despatch Industries
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Despatch
Product Warranty
Parts, Materials and Labor
Despatch warrants all parts and materials to be free from defects in material and workmanship for a period of one (1) year from the
date of shipment unless otherwise mutually agreed upon in writing, or 2,000 hours of operation, whichever occurs first. (Note:
Laboratory oven electric heaters are warranted for a period of five [5] years from date of shipment.)
Despatch will repair or replace, at Despatch’s option, FOB Despatch's factory, parts and materials covered by this warranty.
Despatch is not responsible for parts or material failures resulting from misuse, abuse, inadequate preventive maintenance, acts
of nature, or non-conforming utilities, including electrical, fuel supply, environmental and intake/exhaust provisions. This warranty
also does not cover normal wear or routine maintenance parts and materials expressly designed as expendable/consumable and
replaceable.
Labor services for parts and materials replacement and repair to support this warranty are available at Despatch’s normal service
fees. This service is provided worldwide by a network of factory trained professionals.
Terms and Conditions
The foregoing warranty shall be deemed valid and binding upon Despatch if and only if the Customer:
1. Installs, loads, operates and maintains the equipment supplied hereunder in accordance with the instruction manual
provided upon delivery and product labeling affixed to the subject equipment.
2. Agrees to follow the Emergency Procedure spelled out below.
Exclusions/Limitations of Liability
This warranty DOES NOT cover expenses incurred in the process of diagnosing and/or repairing equipment resulting from:
a) operator error, b) attempted service or modifications by other than Despatch authorized technicians, ¢) any use of the equipment
which is inconsistent with the operation manual or labeling, d) inadequate preventive maintenance, or e) acts of nature, such as
floods, fire, earthquake, or acts of war or civil emergency.
Despatch shall not, in any event, be liable for indirect, special, consequential or liquidated damages or penalties, including loss of
revenue, profits or business opportunities resulting from interruption of process or production. Despatch shall further be held
blameless for any damages or expenses resulting from delays in our attempts to diagnose and repair the equipment, unavailability
of spare parts or inaccessibility of the equipment. Specifically excluded from this warranty is responsibility for internal and external
corrosion damages to the equipment.
Non-Compliance
Despatch reserves the right to suspend and withhold service as provided under this warranty in the event of non-compliance by
the Customer to any terms and conditions of this warranty. Further, Despatch is held harmless for any loss of production, incurred
expenses, and other inconveniences due to suspension of service under this non-compliance provision.
Emergency Procedure
In an emergency situation, Customer agrees to: a) immediately shut off fuel or energy supply (gas and electricity), b) call 911 for
emergency assistance if needed, and c) call Despatch Service.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER EXPRESS AND IMPLIED WARRANTIES
WHATSOEVER, AND SPECIFICALLY THERE ARE NOT IMPLIED WARRANTIES OF MERCHANTABILITY OR OF FITNESS FOR
A PARTICULAR PURPOSE.
THE FOREGOING WARRANTY IS NOT TRANSFERABLE IN SITUATIONS WHERE EQUIPMENT OWNERSHIP IS
TRANSFERRED TO ANOTHER PARTY. |
| Despatch Service
Worldwide Phone 612-781-5363; Worldwide Fax 612-781-5185; North American Phone 800-473-7373
Please see reverse side for other service offerings BB5 (5/97)
Despatch
Service Support Programs
Despatch continues to deliver exceptional products backed by a strong sense of responsibility and drive for long term customer
satisfaction. Your partnership with Despatch can offer even higher value through your subscription to one of Despatch's high value
service programs.
Warranty
Despatch's exclusive, comprehensive service programs start with the warranty which is described on the other side of this
document. This warranty can be expanded immediately to meet your most stringent service needs. Despatch Service will be able
to answer your service questions and provide a quotation for the immediate expansion of your product warranty.
Immediate Service Response
The key to an effective service program is response. Wherever your location, Despatch is only a phone cali away. Our North
American customers can reach Despatch at 1-800-473-7373. Worldwide customers can call 1-612-781-5363 or FAX
1-612-781-5485. Our Customer Service Technicians have over 200 years combined experience and access to detailed design and
manufacturing documentation specific to your Despatch unit(s). This exacting level of service is a benefit only Despatch can provide
and means that you can expect speedy, accurate and the most cost effective response.
Field Service Network
A worldwide network of factory trained Service Professionals is available to support your Despatch equipment. From routine repair
to certified instrument calibration, the Despatch service network is positioned to respond to your needs. As a manufacturer of custom
equipment, our service programs are customized to meet your specific needs regarding:
Service scope
Response time .
Preventive maintenance frequency and content
Payment method
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Sustained Service Support
‚At Despatch, long term customer satisfaction means more than just responding quickiy and effectively to our customers’ service
needs. It means offering comprehensive customer support well beyond the scope and duration of our initial warranty. Despatch
offers two basic service packages which are customized to each individual customer’s need. These service packages are titled Full
Service and Preventive Maintenance Plus+ service agreement products. Each is unique in the industry and offer the following
benefits:
Priority response for minimum production interruption
Preventive maintenance for longer product life
Discounts on parts and services
Various payment plans to ease budgeting and recording expenses
Reduce purchase ordering costs
EN
Despatch Service
Worldwide Phone 612-781-5363; Worldwide Fax 612-781-5185; North American Phone 800-473-7373
PREFACE
This manual is your guide to the Despatch oven. lt is organized to give you the
information you need quickly and easily.
The INTRODUCTION section provides an overview
of the Despatch oven.
The THEORY OF OPERATION section details the
function and operation of assemblies and subassem-
blies on the Despatch oven.
The INSTRUCTIONS section provides directions on
unpacking, installing, operating and maintaining the
Despatch oven.
The APPENDIX section contains Special Instructions
for operating the control instrument, a Troubleshoot-
ing Table, a list of Accessories and a Warranty.
An efficient way to learn about the oven would be to
read the manual while working with the correspond-
NOTE:
Read the entire
INTRODUCTION and
THEORY OF OPERATION
before installing the oven.
Failure to heed warnings in
this instruction manual and
on the oven could result in
personal injury, property
damage or death.
ing oven control system. This will give you practical hands-on experience with informa-
tion in the manual and the oven.
Before operating the equipment, be sure you understand all of the technical information
contained in this manual. Information skipped, not understood or misunderstood couid
create the possibility of operating the equipment in an unsafe manner. This can cause
damage to the oven or personnel or reduce the efficiency of the equipment.
TABLE OF CONTENTS
INTRODUCTION ...... iin FI 1
Special Features ............ ae see ee aa a ae a eee a ee eee 1
Specifications . ........... a eee eee sa ea ae eve aaa 2
Dimensions ............—..em0rereereri eee. ae 2
Capacities ...... ee o 3
Temperature ....................... aaa adoran eaenr eri veroon. 3
Power ........ e. e0dereerercecrerecdorerererereaarenrereerorere 4
THEORY OF OPERATION ......... 00000000 sa ae [PE 5
ProtocolTM RS 6
Keypad Controls ........ SP Cee 7
Status Indicator LEDs. ........ ee 8
OperatingModes ............. iii. TE . 8
Manual Mode ..................00000a0diderereerecerereccrain. O
Timer Mode ..........e_.oeeececeerecreaco. FE 9
Program Mode ......... erre 9
Calibration Zero Offset .......... FR A 4 ea 4 A A A a Aa ea 140 eee 10
“Tune Setting ... A aa ea a a a aa eee 11
Protocol™ Hi-Limit . ........................... ea aaa 12
INSTRUCTIONS ee ec 13
Unpacking and Inspection ................ iL, a. 13
Set-up E aaa RS 14
Operating ..........20000 004444444444 4 4 A4 A A ee ae A ea a a a a 15
Loading the Oven ..........000000 04e a eee ea ea a sa ae Lee 15
Pre-Startup Checklist . ............................. aaa 16
Startup .........eoeeceeeorereiorr redee rr. errerecoeereven . 17
Manual Mode ............. e... ada aerea reorez. 18
Timer Mode ............e oe seeeraererrecrzecreerrenevore na. 20
Program Mode ................—.c2emeseeresr reee. ee 22
Maintenance .. ee raro ere. 26
Checklist .......................... ee A a A ea eee 26
Tests 112201200000 LL 4 AR A LA A A4 4 AA 4 A 4 A 4 A Ne 4 rerorereo, 27
Replacement ......... a a a ee eee eee a a ee eee 27
Parts. .....102000 0014 LL 4 A 4 AN A4 4 A 4 4e 4 A4 4 4 4 4 A 4 A4 4 4 4 4 A A 000 27
Protocol™ Instrument . .......... —2..mresrrrear0r00en0rene. 28
Heater Unit . .. 0r0rirererenrerecooerer 28
Fan Motor ....... SE 29
APPENDIX «+ oo ooo ee a areeaeoeeeer ies e. 31
Special Instructions... .... eee ea ee eee ee eee tea eee 31
Control Instrument ...............20244 00000004 ee A 4 A a aa 0 31
Tune Mode .............0100200 00404 444 4 4 a ea 4 ea a aa 0e 04000 a 31
Calibration Mode .............—.em]ereerarerere vere orererrre 34
Calibration Recovery .........._—.—_—e.0e0e0eenecrrerrrrr ere. 39
Diagnostics Mode . . ....... н екон нак н НН нно о 40
Power Failure ................eéeeereeerreorrerrerenorerrece_ 41
Power Failure .............ooeerreereee0rerorerrareerrerre ve. 41
Programming Examples and Outline ............ eee 42
Example 1 -ManualMode ............. ci e eee 42
Example 2 - Timer Mode ......... eee 46 ee 43
Program Mode ......... ee ee 44
Troubleshooting ............2000 004 eee ee eee ee eee a a a a eee es 50
Accessories + + + vo eee ee Le a aa a A a ae 52
INTRODUCTION
This section provides an overview of the Despatch Classic™ LAD Series ovens. The
LAD Series Ovens have the most effective heat distribution and the fastest processing
time of any lab ovens their size. Air is discharged from the left side wall of the oven
and circulates through the chamber.
Special Features
The sturdy construction and four inch insulation (five inches in the front) of the Des-
patch LAD Series ovens contribute to excellent temperature uniformity.
Despatch LAD Series ovens also incorporate a modular microprocessor based digital
control. The Despatch Protocol™ temperature controller features:
* PID tuning
- programmable up to 48 segments
«built-in manual reset Hi-limit control
* built-in process timer
+ self-diagnostics
+» digital display
* three (3) event outputs
- recursive profile capability
- optional RS-422/RS-485 capability
Other special features include the following:
+ Class A features forced exhaust with airflow switch, pressure relief panel and purge
timer.
+ Unique Despatch design to combine higher fan volume of forced recirculated air
with a system of perforated stainless steel walls for the ultimate in temperature
uniformity. |
+ Welded double wall construction and fiberglass insulation to reduce heat loss.
Silicone rubber gaskets further minimize heat leakage.
+ Rapid response heater with a five year warranty.
+ Scratch-resistant Silver-Clay® baked enamel exterior and stainless steel interior for
easy cleaning.
Specifications
Dimensions
LFD 1-42 |20 {18 |20 4.2 33 41 45 9
(50) |(46) |(51) |(120) Pi |(84) (104) (114) -
LFD2-11 las [20 |26 11.0 54 35 78 6
(96) | (50) |(66) — | (310) (137) | (88) (198)
LFD224 (48 |24 |36 24.0 66 38 89 9
(122) | (61) |(91) |(680) (166) | (98) (226)
Capacities
Maximum Load
Maximum Shelf Load
Exhaust at 177 °C (350 °F)
Recirculating Fan
Approximate Weight Net
Approximate Shipping Weight
Solvent Handling Capabilities
at 177 °C (350 °F)
Lbs
Lbs
CFM
HP
CFM
HP
Lbs.
- KG
Lbs.
KG
150
30
25
1/50
300
1/4
380
173
510
232
0.025 GPH
of VM and P
180
60
38
1/3
1,000
1
795
361
1,095
498
0.042 GPH
of VM and P
300
100
122
1/3
1,500
2
1,015
461
1,415
643
0.14 GPH
of VM and P
Temperature
В ES
re
Time to Temperature 25°C - 100°C | 4 4 2
(approximate minutes with 25°C - 200°C | 11 11 10
no load) 25°C - 343°C | 29 28 38
Recovery Time Door Open 1 Min. 100°C | <1 <1 <1
(approximate minutes with 200°C | 2 3 3
no load) 343°C | 4 8 7
Temperature Uniformity at 100°С* | +1°С +1°C +1°C
| 200°С* | +2°С +2°С +2°C
343°C* | 44°C +4%C +4°C
Minimum Operating Temperature dampers open | 40°C 30°C 30°C
(Approximate w/20°C ambient) dampers closed | 50°C 40°C 55°C
Control Stability +0.3°C +0.3°C +0.3°C
Repeatability £0.5°C |+05%C +0.5°C
Cooldown Time 343 - 50°C dampers open | 46 40 27
(approximate 343 - 75°C dampers closed | 110 120 85
minutes with no load)
* Figures are based on actual tests in an empty oven.
and operating conditions.
Uniformity can vary slightly depending on unit
Power
Line voltages may vary in some geographical locations. If your line voltage is much
lower than the oven voltage rating, warm up time will be longer and motors may
overload or run hot. If your line voltage is higher than name plate rating, the motor may
run hot and draw excessive amps.
If the line voltage varies more than 10% from the oven voltage rating, some electrical
components such as relays, temperature controls, etc. may operate erratically.
Power Requirements
LFD 1-42 240 28.7 —- 50/60 1 6
LFD 2-11 208 39.7 60 3 9
240 34.9 60 3 9
480 17.5 60 3 9
LFD 2-24 208 76.2 60 3 16
240 66.8 60 3 16
480 33.4 60 3 16
* A kit is required for 240V - 1PH - 50Hz operation. Units will operate on a 220V - 1PH - 50 Hz line.
Units are modified for 3 PH, 50Hz operation.
THEORY OF OPERATION
This section details the function and operation of assemblies and subassemblies on the
Despatch LFD Series Ovens. These ovens have the most effective heat distribution
system and the fastest processing time of any lab ovens their size. They are especially
useful for testing, preheating, sterilizing, drying, aging and curing as well as other
production applications. Horizontal airflow with precision digital control delivers uniform,
fast processing. The overall result is efficient productivity under strenuous conditions.
v v V Y Y Y
| —
ANN
a
Fresh
Air
Figure 1. Horizontal Airflow
The unique Despatch computerized design, moves forced convected heat through
perforated stainless steel walls. The air is recirculated with a high volume fan.
Despatch LFD Series Ovens employ higher volume fans than any competitive model.
The chamber can be densely loaded without interfering with the process. The LFD
series air delivery temperature is within 1/2 °C of the number appearing on the digital
display. Also, fresh air intake is regulated by a panel-mounted damper control, while
the exhaust rate is fixed. The exhaust rate is regulated by an adjustable control on the
exhaust stack.
Protocol ™
The ovens are equipped with a modular microprocessor based digital temperature
controller.
O O
OPERATING INSTRUCTIONS
1 Prosa POWER ON, tha display reada (MAHUAL)
1. Prose GAT), press . D
Power on PROTOCOL
3. sing the +i Layos saber the HELI de e velos
©
5. Using the +- keys, onter the SETPOINT de Ma a | () © © 0) Hooter an O
smalvad agurviias tantarbra. demago, peremal! injury aw death,
ni ez ВОИ Mand oa Dit peta O
e root DOOM # ©
2. BO MOT una any Rawmabla ssbroat ov thor
7, ress HEATER OH snd START, the HEATER ON : Samii - equipment Timor Tuno Er Over Toma |
нары чи Ноно Аа обе even temperature UNLESS the squipmond hi Seslgnad fof 5 spasifia и ` snk
sppronshos the SETPOINT, tvs HEATER ON ght à af ootront (Le. LED 29rios), Enscadino 1 ( ) ( (+ tema ©
will aysin on sá pl pasa dt at pivalve aimesplnro, pe a -
Mentor
3. bo not uen tie equipment Ma a wet, esrresiva or Progrom Wea — er Relay O
8. Wien the heuting cycle la to, presa ETOP explosiva aimesphars. „И ;
and HEATER OFF, lo nai turn the POWER OFF ( ) vu (+) ( Powers | С)
until the even somperaiers la blow 1096/444F). «в A att aquipment Sa —
Homa Rasa Maater olf
PE т prover sand.
plenso sonsult ve обе Вон, nutria, U. Ba not 05.2000 Ihe Maschen sparsiing
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Figure 2. Control Panel
The Despatch Protocol™ temperature controller is a dual functioning controller/high
limit instrument. The control portion of Protocol™ incorporates a microprocessor to
digitally control process variables with minimal temperature fluctuations.
The high limit portion of Protocol™ protects the product and/or the oven itself. If the
product being processed has a critical high temperature limit, the Hi-Limit parameter
should be set to a temperature somewhat below the temperature at which the product
could be damaged. If the product does not have a critical high temperature limit, the Hi-
Limit parameter should be set to a value slightly higher than the highest programmed
setpoint to protect the oven equipment.
Keypad Controls
The Despatch Protocol™ temperature controller has six keys that provide the six
operating modes.
Manual MANUAL Operation Single setpoint control
Timer TIMER Operation Single setpoint control with process timer
Program PROGRAM Operation Programmable contro! with three event outputs
Tune TUNE Configure Set instrument parameters
Calibrate | CALMODE Service Performs instrument calibration
Diagnostics DIAGNOSE Service Performs instrument thermocouple tests, SSR
power level and event output tests.
The Despatch Protocol ™ temperature controller also has ten (10) touch-keys so that
the user can easily operate the controiler.
Protocol Touchkeys
A To move up through any mode
v To move down through any mode
+ To increase a setpoint or parameter
- To decrease a setpoint or parameter
Home To move to the beginning of any mode or segment
Reset To reset the control when an error has been corrected or to view the profile number,
segment number and the number of loops (repeat times) remaining.
Heater On To initiate heater relay
Heater Off To disengage heater relay
Start | To start an operating mode
Stop To stop an operating mode
Status Indicator LEDs
Protocol™ has seven indicator LEDs that provide the following relevant information to
the user.
Protocol Indicator LEDs
Power on Lights when the power on pushbutton is pressed.
Heater relay Lights when a mode is ready for operation and the heater on key is pressed.
Soak Deviation Lights when the process temperature is not held within the user specified
soak deviation limits. The light turns off when the temperature is within the
soak deviation limit. |
Over Temp Lights when the process temperature exceeds the high limit value. The over
temperature light remains lit until the Reset key is pressed.
Control T/C Error Lights when Protocol™ receives a control thermocouple error.
Heater on Lights when the heater is activated by the control circuits.
Hilimit T/C Error Lights when Protocol ™ receives a Hi-limit thermocouple error.
The Despatch Protocol™ temperature controller has been designed for ease of use
while maintaining elaborate and versatile control capabilities.
Operating Modes
Protocol™ has three primary modes of operation: the Manual mode, the Timer mode
and the Program mode.
Manual Mode
The manual mode is a single setpoint control mode that controls the process at the user
specified setpoint for an indefinite period of time. The manual mode controls the oven
temperature within close limits as specified by the PID tuning parameters.
Whenever the instrument is powered by the Power on pushbutton, Protocol ™ starts at
the manual mode.
Timer Mode
The timer mode is a single setpoint control mode with a built-in process timer that starts
timing either at the beginning of the process or at a user specified temperature. As in
the manual mode, the timer mode uses the PID parameters set in the tune mode.
Program Mode
The program mode is a programmable ramp and soak control consisting of up to eight
profiles. Each profile consists of up to six segments for a total of 48 segments (8 x 6 =
48). Any one profile may be run recursively from two to 99 cycles or even continuously
if it is desired.
Each segment consists of a ramp and soak period. During the ramp period, the control
will track oven temperature. For example, a ramp is entered to heat from 100° C to
150° C in 50 minutes. Protocol™ will track the temperature 1° C every minute for 50
minutes. During the soak period, temperature is maintained as specified by the tuning
and soak deviation parameters.
Protocol™ will not allow a soak time to begin until the actual oven temperature is within
the soak deviation limit. This process is called assured soak. The ramp and soak
periods are adjustable from 0 to 99 hours, 59 minutes. Within each ramp and soak
period, up to three event outputs can be programmed either on or off.
The event relay is used for factory installed modifications, then disconnected before
shipping. Please consult the factory for information on connecting the event outputs.
When the events are connected, the user has the capability of controlling relays,
solenoid valves, etc., throughout the programming cycle.
Calibration Zero Offset
The Calibration Zero Offset (CZO) of Protocol™ has been preset and tested for the
specified operating conditions. Special instructions for accessing the tune mode to
change the CZO are referred to in the Appendix of this manual.
CZO 0.0
Figure 3. CZO Function in Tune Mode of Protocol"
The CZO may be useful to make the following small temperature corrections to the
control system. |
e Correction of known sensor calibration errors.
e Correction of any known steady temperature offset between the heated work-piece
(load) and sensor. This is useful for applications where the sensor cannot be
located exactly at the work-piece.
« Alignment of temperature indications in a multi-zone/multi-controller application,
e.g., at ambient temperature. | |
Note that the CZO changes the value of the controlled temperature when used in
closed loop control. The CZO function can be represented by the equations:
Temp Indication (°F) = Sensor Temp (°F) - CZO% [100 (°F) - Sensor Temp (°F)]
Temp Indication (°C) = Sensor Temp (°C) - CZO% [38 (°C) - Sensor Temp o)
The CZO function is a straight line pivoted around 100° F (38° C). Thus, the CZO
functions as an offset and has the ability to change the slope of a temperature range.
10
Calibration Zero Offset Examples
0 10 20 100°F
100°F | 200°F 0° 0° |
20° 100°F 100°F 180°F
A more useful formula is one that the user can use to calibrate Protocol™ to match the
center of the chamber. This requires the use of a temperature measuring device with
its thermocouple junction located at the center of the chamber. CZO can be directly
calculated by:
Tune Setting
The Protocol™ has been preset and tested for normal operating conditions. Special
instructions for changing the tune setting are referenced in the Appendix of this manual.
Center Temp (°F) - Protocol™ Display (°F)
Center Temp (°F) - 100 (°F)
CZO = 100
Center Temp (°C) - Protocol™ Display (°C)
Center Temp (°C) - 38 (°C)
CZO = 100
The Protocol™ on the oven can be manually tuned. For your convenience the factory
has tested and preset the PID action to its optimum values. These values need not be
changed under normal operating conditions.
5°C 30 0 degrees/second
seconds/repeat
11
Protocol™ Hi-Limit
Protocol" will not let the high limit value drop below the setpoint value. In certain
situations, it may be necessary to change the setpoint first and then adjust the high limit
value.
It will be necessary to reset the Hi-Limit whenever it has tripped. The Hi-Limit may be
reset by first allowing the oven chamber to cool slightly (or increasing the parameter by
several degrees) and pushing the Reset key. During a high limit condition the Over
Temp LED will turn on thus deactivating the heater.
12
INSTRUCTIONS
The INSTRUCTIONS section provides directions for unpacking, installation, operation
and maintenance of the Classic™ LFD Series oven.
Unpacking and Inspection
Remove all packing materials and thoroughly inspect the oven for damage of any kind
that could have occurred during shipment.
See whether the carton and plastic cover sheet inside carton are still in good
condition.
Look at all outside surfaces and corners of the oven for scratches and dents.
Check the oven controls and indicators for normal movement, bent shafts, cracks,
chips or missing parts such as knobs and lenses.
Check the door and latch for smooth operation.
If there is damage that may have occurred during shipment, follow these instructions.
1.
2.
Contact the shipper immediately and file a written damage claim.
Contact Despatch Industries to report your findings and to order replacement parts
for those that were damaged or missing. В
Send a copy of your filed damage claims to Despatch.
Next, check to make sure you have received all the required materials. Your
shipment should include:
One (1) Despatch oven,
One (1) Instruction manual,
One (1) Warranty card,
Two (2) Shelves
13
5. If any of these items are missing from the packaged contents, contact Despatch
Industries to have the appropriate materials forwarded to you.
6. Finally, to protect the warranty on your new LFD Series Oven, complete the
“warranty card and mail it to Despatch within 15 days after receipt of the equipment.
Set-up
1. Select the location for installing your oven.
If solvents are going to be used in the oven, you | Do not use the oven in wet,
must install an exhaust stack to the outside of corrosive or explosive |
the building. Go to step 2. atmospheres unless this
oven is specifically designed
for a special atmosphere. |
If no exhaust stack is necessary, go to step 3.
2. Install an exhaust stack from the rectangular
exhaust fan discharge stack to the outside of the building.
e Ifa round exhaust stack is used, a minimum area greater than the area of the
exhaust stack is required. |
* The flashing through the roof or wall must be capable of handling an exhaust
stack temperature up to 343 °C (650 °F).
« All stacks must comply with state and local building codes to insure that
surrounding combustible surfaces are below 71 °C (160 °F).
+ Design the exhaust stack to limit the amount
of restrictions to insure proper airflow. If | BRIERE.
more than two (2) elbows are used in the WARNING:
stack, over all airflow will be reduced. If
airflow is reduced, the amount of solvent that
can be safely used with the equipment must
also be reduced.
All grounding and safety
equipment must be in
“compliance with applicable
codes, ordinances and
accepted safe practices.
3. Place oven on a bench top or an optional
cabinet base.
The oven must have a minimum 2 inch clearance in the rear to provide proper
ventilation. When placed next to another cabinet, or next to another oven, a 3 inch
clearance is required. The doors will still open.
14
4 Make sure oven is level and plumb; this will assure proper heat distribution and
operation of all mechanical components.
5. Identify correct power source indicated on the specification plate.
6. On the larger units, remove the control panel and the filler panel to expose the
equipment mounting area.
7. Hardwire the oven directly to the electric supply. On larger units the oven line
connection is located on the equipment mounting panel.
Operating
Users and operators of this oven must comply with
operating procedures and training of operating
personnel as required by the Occupational Safety and
Health Act (OSHA) of 1970, Section 5 and relevant
safety standards, and other safety rules and
regulations of state and local governments. Refer to
the relevant safety standards in OSHA and National
Fire Protection Association (NFPA), Section 86 of
1990.
Loading the Oven
WARNING:
Do not use oven in wet,
corrosive or explosive
atmospheres unless this
oven is specifically designed
r a special atmosphere.
Despatch Industries cannot be responsible for either the process or process
temperature used, or for the quality of the product being processed. lt is the
responsibility of the purchaser and operator to see that the product undergoing
processing in a Despatch oven is adequately
protected from damage.
Carefully following the instructions in this manual
will help the purchaser and operator in fulfilling that
responsibility.
When loading the oven avoid spills of anything onto
the heater elements or onto the floor of the oven.
Do not place the load on the oven floor plate. This
WARNING:
This equipment is designed
amount could result in
explosion.
=xceeding this
may cause the load to heat unevenly and the weight may cause shorting out of the
heater elements. Use the shelves provided.
15
The two shelves are designed to be pulled out about half way without tipping. The
support capacity of the shelves is listed in the Capacities Table in the Specifications
section in this manual. Do not overload the shelves.
Distribute the workload evenly so that airflow is not restricted. Do not overfill your oven.
The workload should not take up more than two-thirds of any dimension of the inside
cavity.
Pre-Startup Checklist
/
Know the system. Read this manual carefully. Make use of its instructions and
explanations. The know how of safe, continuous, satisfactory, trouble-free opera-
tion depends primarily on the degree of your understanding of the system and of
your willingness to keep all parts in proper operating condition.
Check line voltage. Voltage must correspond to nameplate requirements of motors
and controls. Refer to the section on power connections in the INTRODUCTION of
this manual.
Fresh air and exhaust. Do not be careless about restrictions in and around the
fresh air and exhaust openings and stacks. Under no condition permit them to be-
come so filled with dirt that they appreciably reduce the air quantity. The proper
ventilation clearances should be fulfilled at all times. Refer to the Set-up
instructions in this manual. |
Ventilation There is an exhaust opening in the rear of the unit that is covered by a
hat bracket. Do not remove the hat bracket as it protects the exhaust opening from
being completely covered.
Helpful hints
For drying ovens, open vent to prevent buildup of moisture.
For sample heating, close the vent when no ventilation is required.
16
Startup
For fastest oven heat-up time, close the fresh-air vent. After the desired temperature is
reached, the vent may be adjusted as needed. An outline and examples for the Manual
mode, Timer mode and Program mode are referenced in the Appendix. A completed
typical program worksheet accompanies all programmable event outputs installed at the
factory.
1. Start the fan.
a. Open oven door.
b. Press Power on pushbutton. You will hear
the recirculating fan start. |
с. Shut oven door.
d. Check that the green Power on LED is on.
OPERATING INSTRUCTIONS
1 Prazs POWER ON, Yve dspley reido (MANUAL) |
2 Presa ни) рн . D ®
: PROTOCOL
8. Using the + kiya, ster the HELMET o y valia Power on
alghty other Han ia ended GETECINT,
+ ron Ten, puns | A warns
5, Valng the + kirys, entes he RETPOINT to the Fibs do head We waming can repull is propañy O O MD O Невы сп O
desired opetrUna temperature. damage, paraonal injury of dewth,
1, Read tha antics Inatruction menial tatwiully before TC Enmore
E. Pa RB tparalirg Ea aquiprnan Come -
AO TA: Eme O
4 DO NOT use any fismmabls solvind of объ:
7. Press HEATER OH wid ETART, ia HEATER ON flammable es explosiva majeriula ln tia eculpment Trier Tuna slop Over Temp O
ПНА ЗИ venir. Ace Dean ven temperature UNLEGA Fa equipment la designed Tor a space
approschsa ihe SETPOINT, the HEATER ON Nghi amount ©! ани (1.6. LFD serra). Extesding this som O
vi cycle co and off. и Ad raul In pho} |
: Неа
5, Do not uss 38 врач, стой Of Program Dag Hasler on Relay ©
E. ‘When the heating cycle la completa, presa STOP Explore atmosphere,
sid HEATER OFF. Do nol tun tha FOWER OFF Power bn O
LANAS even temperature la blow 10050212). 4. Do no allempt amy Brick of this Squipment
within diconnecting the rin power lich of
posee cod. Home пней Heater off
Fer further strucliona an ihe opsialing mpdes, -
please coruvll the huirolon manaal., 5. De pot 44d 6 racdmcia operating
temperaiure.
e. The purge timer will begin timing. The minimum purge time is:
LFD 1-42 = 2 minutes
LFD 2-11 = 3 minutes
LFD 2-24 = 2 minutes
f. Upon initial start-up on three (3) phase units, verify proper fan rotation (direction
of arrow)
2. Check airflow switch. Check for proper make and break of the contacts when the
exhaust fan is started and stopped.
3. Program the Protocol™ for the desired operating mode. Refer to the following
17
instructions for the Manual mode, the Timer
mode and the Program mode.
Manual Mode
Startup
The following are startup instructions for the Manual
mode.
1. Select the Manual mode. Press the Power on
key or the Manual key. MANUAL will be
displayed.
2. Enter the high limit temperature.
a. Press the v key. HI-LIMIT will be displayed.
b. Press the v key.
c. Use the + or - keys to enter the high limit
temperature to a value slightly higher than the
intended setpoint.
3. Enter the setpoint.
a. Press the y key. SETPOINT will be displayed.
b. Press the v key.
c. Use the + or - keys to enter the setpoint to the desired operating temperature.
18
The following are run instructions for the Manual
Run
mode.
1. Press the y key. READY will be displayed.
2. Press the Heater on key. The Heater Relay
LED will illuminate.
3. Press the Start key. The Heater on LED will
illuminate and the setpoint and actual temperature will be displayed. As oven
temperature approaches setpoint, the Heater on LED will cycle on and off.
Stop
The following are stop instructions for the Manual mode.
1.
2.
3.
4.
5.
Press the Heater off key. The Heater Relay LED will shut off.
Wait for oven temperature to fall below 100°C (212°F).
When the Manual mode is complete, press the Reset key to display the final
process temperatures.
Press the Stop key.
Press the Power on pushbutton to turn power off.
An example of the Manual mode is referenced in the Appendix.
19
Timer Mode
Startup
The following are startup instructions for the Timer mode.
1. Select the Timer mode. Press the Timer key. TIMER will be displayed.
2. Enter the high limit temperature.
a. Press the v key. HI-LIMIT will be displayed.
b. Press the v key.
c. Use the + or - keys to enter the high limit
temperature to a value slightly higher than the
intended setpoint.
3. Enter the setpoint.
a. Press the v key. SETPOINT will be displayed.
b. Press the v key.
c. Use the + or - keys to enter the setpoint to the desired operating temperature.
4. Enter the process time.
a. Press the y key. TIME will be displayed.
b. Use the + or - keys to enter the time of the process. (HHMM (hours/minutes) c or
MMSS (minutes/ seconds) selected in the tune mode.)
5. Enter timer starting temperature.
a. Press the v key. TEMP YES/NO will be displayed.
b. Use the + or - keys to select either YES or NO.
e Press the - key to display NO and begin timing at ambient.
e Press the + key to display YES and begin timing at the following input
temperature.
20
The following are run instructions for Timer mode.
1.
2.
c. Press the y key. TEMP and the begin timing
temperature will be displayed.
d. If YES was selected in step b, use the + or -
keys to enter the temperature at which the
process timer begins timing.
If NO was selected in step b, this setpoint has
no bearing on oven operation.
Run
Press the v key. READY will be displayed.
Press the Heater on key. The Heater Relay
LED will illuminate.
Press the Start key. The Heater on LED will illuminate and the setpoint and the
actual temperature will be displayed. As the oven temperature approaches the
setpoint, the Heater on LED will cycle on and off.
Manual Stop
The following are manual stop instructions for the Timer mode.
1.
2.
5.
Press the Heater off key.
Wait for oven temperature to fall below 100°C (212°F).
When the Timer mode is complete, press the Reset key to display the final process
temperatures.
Press the Stop key.
Press the Power on pushbutton to turn power off.
An example of the Timer mode is referenced in the Appendix of this manual.
21
Program Mode
Startup
The following are startup instructions for the Program mode. In any one segment, if the
ramp and soak times are zero, Protocol™ ignores the remaining segments of the
profile. A soak period will not begin until the actual oven temperature is within the soak
deviation limit. During any segment of a profile, if the actual oven temperature falls
outside of the soak deviation limit, the Soak Deviation LED will be illuminated.
1. Select the Program mode. Press the Program
key. PROGRAM will be displayed.
2. Enter the high limit temperature.
a. Press the v key. HI-LIMIT will be displayed.
b. Press the v key. The high limit temperature
will be displayed.
c. Use the + or - keys to enter the high limit
temperature to a value higher than the
intended setpoints.
3. Enter the profile number.
a. Press the v key. PROFILES will be displayed.
b. Press the v key. PRO - 1 will be displayed.
c. Use the + or - keys to enter the profile number to
program.
4. Program the profile.
a. Press the y key. SEG - 1 will be displayed.
b. Program the ramp rate.
i. Press the y key. RAMPO0001 will be displayed.
ii. Use the + or - keys to enter the ramp time.
22
c. Program the events desired during the ramp
time.
i. Press the y key. EVENTS will be
displayed.
ii. Press the v key for each event.
. Use the + or - keys to program the event outputs ON or OFF for the ramp
period.
d. Program the ramp ending temperature.
i. Press the y key. TEMP and the ramp
ending temperature will be displayed.
Use the + or - keys to enter the desired
ramp ending temperature.
e. Program the soak time.
i. Press the y key. SOAK and the soak time
will be displayed.
. Use the + or - keys to enter the soak time.
f. Program the events desired during the soak
time.
i. Press the y key. EVENTS will be
displayed.
Press the v for each event.
. Use the + or - keys to program the event ON or OFF for the soak period.
g. Enter the remaining segments 2-6 by following steps a through f.
5. Enter the Soak-Deviation.
a. Press the v key until SOAK-DEV is displayed.
b. Press the v key. The symbol + will be displayed.
23
c. Use the + or - keys to enter the soak
deviation limit. |
6. Enter the next profile.
— a. Press the v key. GOTO will be displayed.
b. Use the + or - keys to enter the profile
number to continue to. |
Options include END and 1 through 8. Select End to stop at the end of this pro-
file. For continuous profiles enter the same number of the profile that is currently
being programmed.
7. Enter the number of profile recursions.
a. Press the v key. REPEAT will be displayed.
b. Press the v key. TIMES will be displayed.
c. Use the + or - keys to enter the number of
times to complete the profile being
programmed (1 - 99).
8. Enter the profile end condition. The hold command is contingent on the final
segment of the last profile to be run only.
a. Press the y key. HOLD will be displayed.
b. Use the + or - keys to select YES or NO.
Selecting YES will hold at last setpoint. The event outputs will be held at their
last value. |
Selecting NO will not hold at last setpoint. The event outputs will be turned off.
24
Run
The following are run instructions for the Program
mode. |
1. Press the Home key until PROGRAM is
displayed.
2. Press the key until PRO - 1 is displayed.
3. Make sure the correct starting profile is entered
by pressing + or -.
4. Press the » key until READY is displayed.
5. Press the Heater on key. The Heater Relay LED will illuminate.
6. Press the Start key. The Heater on LED will illuminate. As the oven temperature
approaches the setpoint, the Heater on LED will cycle on and off. During process-
ing, the display shows the setpoint on the left and the actual oven temperature on
the right. |
Manual Stop
The following are manual stop instructions for the Program mode.
1. Press Heater off key.
2. Wait for oven temperature to fall below 100°C (212°F).
3. Press the Reset key to display the final process temperature.
4. Press Stop key.
5. Press Power on pushbutton to turn power off.
Examples of the Program mode are referenced in the Appendix of this manual.
25
Maintenance
Do not attempt any service on this oven before opening the main power disconnect
switch.
Checklist
v Keep equipment clean. Gradual dirt accumulation retards air flow. A dirty oven can
result in unsatisfactory operation such as unbalanced temperature in the work
chamber, reduced heating capacity, reduced production, overheated components,
etc. Keep the walls, floor and ceiling of the oven work chamber free of dirt and dust.
Floating dust or accumulated dirt may produce unsatisfactory work results. Keep all
equipment accessible. Do not permit other materials to be stored or piled against it.
v Protect controls against excessive heat. This is particularly true of controls, motors
or other equipment containing electronic components. Temperatures greater than
51.5°C (125°F) should be avoided.
v Establish maintenance & checkup schedules. Do this promptly and follow the
schedules faithfully. Careful operation and maintenance will be more than paid for
in continuous, safe and economical operation.
v Maintain equipment in good repair. Make repairs immediately. Delays may be
costly in added expense for labor and materials and in prolonged shut down.
v Practice safety. Make it a prime policy to know what you are doing before you do it.
Make CAUTION, PATIENCE, and GOOD JUDGEMENT the safety watchwords for
the operation of your oven.
v Lubrication, Fan motor bearings are permanently lubricated. All door latches,
hinges, door operating mechanisms, bearing or wear surfaces should be lubricated
to ensure easy operation.
26
Tests
Tests should be performed carefully and regularly. The safety of personnel as well as
the condition of equipment may depend upon the proper operation of any one of the
functions of the Protocol™. Test the Protocol™ every 40 hours. Check that the heater
LED is cycling on and off, indicating that the heater is working. In the manual mode,
enter the HI-LIMIT to the same value as the setpoint. Run manual mode.
When the oven temperature reaches
setpoint, the Hi-limit should shut down
the system. The HI-LIMIT must be
manually reset by pushing the Reset
key.
Replacement
Parts
To order or return parts, contact the Service Products Divi-
sion at Despatch. The Service Products features our Re-
sponse Center for customer service. When returning parts,
a Despatch representative will provide you with an MRA
(Material Return Authorization) number. The MRA number
must be attached to the returned part for identification.
When you are ordering parts, be sure to give the model
number, serial number and the part number. This will
expedite the process of obtaining a replacement part.
When you have a service need, contact the Response
Center at 1-800-473-7373: FAX 612-781-5353.
27
Protocol™ Instrument
(Tools needed: one quarter (%) inch socket set)
1.
2.
Disconnect the power.
Remove the screws from the face of the control panel and slide it forward.
Disconnect the thermocouple wires and the ground wire.
Disconnect any event output wires, noting the proper connections.
Disconnect the control panel from the oven by unplugging the quick disconnect plug.
ОО
Figure 5. Top View of J Type Thermocouple Inputs on Protocol™
Connect the new control panel to the quick disconnect plug.
Connect the thermocouple wires and ground wire.
Connect the event output wires (if applicable).
Replace the control panel.
Heater Unit
(Tools needed: Crescent wrench, screwdriver, one quarter (7) inch socket set)
1.
2.
Remove the floor plate.
a. Remove the screws from the floor plate.
b. Lift the floor plate out of the oven.
Disconnect the heater leads from heater element with a wrench. Note which wires
28
go on which terminals.
Unscrew the screws holding the heater frame to the oven body.
Remove the heater and discard.
Screw down the new heater frame.
Attach the heater leads to appropriate terminals.
Replace the interior floor and screws.
Fan Motor
(Tools needed: Screwdriver, 5/32 inch Allen wrench, one quarter (74) inch socket set)
1.
Remove the floor plate.
a. Remove the screws from the floor plate.
b. Lift the floor plate out of the oven.
Remove the left side wall.
Remove the fan inlet plate.
Loosen the set screws (2) on fan wheel in middle of oven bottom. You can reach
the fan wheel by going through the heater or by disconnecting and removing the
heater. Refer to the Heater Unit instructions.
Place the oven on its back.
Remove the bottom plate. This will reveal the fan motor.
Remove the fan motor.
a. Unscrew the screws (4) holding motor mounts to the body.
b. Disconnect the motor leads from the terminal strip on the power panel.
c. Lift the fan motor from the oven body.
After the fan wheel has run at temperature for awhile, it will stick to the shaft.
29
Some force may be required to separate the fan wheel from the fan motor shaft
8. Take the motor mounts off old motor.
9. Put the motor mounts onto new motor.
10. Replace the fan motor.
a. Insert the shaft into shaft collar. Put the fan wheel onto shaft from inside oven.
b. Reattach the motor mounts to the oven body, making sure grommets are in
place. | |
c. Reattach the motor lead wires to the terminal strip.
11. Replace the oven bottom.
12. Turn the oven right side up.
13. Adjust the fan wheel for 3/16 inch clearance between the wheel and the inlet
ring.
"14. Tighten the set screws on the fan wheel.
15. Check that the set screws hit the flats machined into the motor shaft.
16. Replace the floor plate.
30
APPENDIX
Special Instructions
~The Protocol™ has been preset and tested at the factory for normal operating
conditions. In most applications, it will not be necessary to alter oven settings. This
section contains additional information and reference for special operating conditions.
Control Instrument
Tune Mode
Various functions of the control instrument are set by parameters in the tune mode. To
access the tune mode, it is necessary to enter the proper code.
1. Press Tune key. The display reads TUNE.
| 2. Press v key. CODE *** will be displayed.
3. Enter + - - + - +. PID TUNE will be displayed.
The PID tuning parameters may be entered. The units are listed below.
P = degrees
| = seconds/repeat
D = degrees/second
31
Tuning Outline
TUNE Selects tune mode.
CODE *** Enter + - - + - +
PID TUNE Enter tuning parameters.
P-1 Proportional band in degrees (+ or - keys).
1-1 Reset in seconds/repeat (+ or - keys).
D-1 Rate in degrees/second (+ or - keys).
DEG - Select °C or °F (+ or - keys).
SPL - Setpoint limit, set to maximum temperature of oven (+ or - keys).
CZO - Calibration zero offset -99.9 to 99.9 (+ or - keys).
DIS Time set in MMSS (minutes/seconds) or HHMM (hours/minutes).
BEEP Select beep on or off (+ or - keys).
PF-RECVR | Power failure recovery mode. Use + or - keys to select from STOP, RESUME or
HOLD.
STOP Program terminates. Must restart from the beginning of the program.
RESUME When power is restored, program resumes at the point where power failure
occurred.
HOLD Program waits for the operator. The operator has a choice of terminating or
resuming the program.
DIG COMM | Digital communications option. Disregard unless Protocol™ is supplied with optional
digital communications interface. For proper setting, refer to the Protocol" software
manual or the Digital Communication User Guide. Select from NO COMM, CPIF or
ASCII (+ or - keys). Select from RS232C or RS422A (+ or - keys). Select address
(ADDR) from 1 to 999 (+ or - keys). |
RECONFIG | For saving changes to DIG COMM options in memory.
PROF CLR | Entering code clears all profiles to default values.
VARS CLR | Entering code clears the SRAM in Protocol™. All parameters must be reset. Should
be done in EXTREME circumstances only. Recalibration is essential.
CODE *E*
For factory installed modifications. Do not change the code setting.
Experience and experimentation with tuning parameters will guide the user in
determining the proper settings when normal conditions are not present.
32
Tuning Worksheet
In most applications it is not necessary to alter tuning parameters. To enter the tune
mode, press Tune. TUNE will be displayed. Press y and enter + - - + - +. Using the
v key and the + or - keys, enter the desired settings. Press the Home key when
finished.
P-1 5 degrees
1-1 30 seconds/repeat
D-1 | 0 degrees/second
DEG- C °F (°C)
SPL- 343 | °F (°C)
0740 varies % degrees - calibrated to center chamber at
300° C
DIS- HHMM | minutes/seconds (hours/minutes)
BEEP On off (on)
Notes:
1. The alternate is listed in ( ).
2. See Table 10, Tuning Outline, for further information regarding display codes.
3. Tuning parameters may change from those set at the factory. Load mass, fresh air
and exhaust damper settings will affect tuning parameters. Some experimentation
is required to determine optimum settings.
Reset times greater than 35 seconds/repeat are not recommended.
33
Calibration Mode
Protocol™ has been tested and calibrated at the factory. Under normal operating
conditions recalibration should not be necessary. However, if the instrument does not
comply with known standards recalibration may be necessary.
Calibration Instructions
We recommend using a certified analog
thermocouple simulator/calibration source with less
than +1° F noise. We have experienced signal
stability problems with some microprocessor based
thermocouple simulator/calibrators which induce an
error during the calibration procedure. This error
generally results in a non-linear shift in the |
controller's indicated temperature.
1. Disconnect AC power to the oven.
SENS HIL
- + G. — + G
Figure 6. Top View of J Type Thermocouple Inputs on Protocol™
2. Remove Protocol™ controller to expose thermocouple input terminals.
3. Disconnect control and Hi-Limit thermocouples from controller thermocouple input
terminals (Control T/C, and Hi-Limit T/C). |
4. Mark thermocouple leads if not labeled.
5. Connect a 6 foot piece of type J thermocouple lead wire to each of the Control T/C
and Hi-Limit T/C terminals.
6. Twist together or jumper the lead wire end not connected to the Control T/C and
Hi-Limit T/C terminals. This creates a junction and prevents a control sensor error
[S-T/C ERR] and Hi-Limit sensor error [H-T/C ERR] caused by an open
thermocouple.
34
. Loosely fasten the Protocol™ controller to the oven.
8. Re-connect AC power to the oven. |
9. Press the Power on pushbutton to energize oven.
10. Press the Tune key. The display reads [TUNE |.
11. Use the Y and 4 keys to scroll through the tune mode configuration. The
controller must be configured to operate in °F (Fahrenheit) and CZO should be se
to zero (0.0).
a. Record initial tune mode parameters prior to making any changes.
b. Press the Y key. The display reads [CODE ***].
c. Press the following key sequence: +, -, -, +, -, +.
he display reads [PID TUNE]. Protocol™ is in the tune mode.
d. Use the following table to change the tune mode parameters.
Tune Mode Parameter Calibration
0° Cto 500° C
32° Fto 932° F
V key ||-1 HEHE 30 + or - keys 0 to 999
| seconds/repeat
Y key |D-1 HHE 0 + or - keys 0 to 999
degrees/second
V key |DEG - C C + key for C or - key for F.
Y key |SPL - ##H | maximum designed + or - keys 0° Cto 500° C
operating 32° F to 932° F
temperature”
Y key |CZO - Hit can vary + or - keys to change -99.9 to 99.9
parameter to 0.0 degrees
Y key |DIS | HHMM + key for HHMM (hours
HHMM and minutes) or the - key
for MMSS (minutes and
seconds).
VW key |BEEP ON ON + key for ON or the - key
for OFF.
1 204° C/400° F, 260° C/500° Е, 343° C/650° F
e. Press the Manual key. The display reads [MANUAL
f. Allow the controller a thirty (30) minute warm up time before proceeding to the
step #13 - CAL MODE.
12. Press the Cal key. The display reads [CAL--MODE].
13. Press the Y key. The display reads [CODE ***1.
+
14. Press the following key sequence: -, +, +, -, +, -.
The display reads [HCAL 250].
15. Apply a 250° F signal to the high limit thermocouple input:
16.
17.
18.
19.
20.
21.
d.
Connect the piece of type J thermocouple lead wire, wired to the High Limit T/C
terminals, to a thermocouple simulator. |
. Set the simulator to output a type J thermocouple signal.
Twist together or jumper the piece of type J thermocouple lead wire, wired to the
Control T/C terminals. This creates a junction and prevents a Control sensor
error [S-T/C ERR] caused by an open thermocouple. Press the Reset key to
clear a Control sensor error [S-T/C ERR] caused by an open thermocouple.
. Adjust the simulator to supply a 250° F signal. Wait for 30 seconds while the
control stabilizes.
Press the following key sequence: -, -, +. The display now reads HCAL 450.
Adjust the simulator to supply a 450° F signal. Wait for 30 seconds while the
control stabilizes.
Press the following key sequence: +, +, -. The display now reads HIL 450.
To verify proper calibration, adjust the simulator to supply a 350° F signal. Within
30 seconds, the display should stabilize and read HIL 350.
To calibrate the control sensor, press the ¥ key. The display reads [SCAL
250].
Apply a 250° F signal to the control thermocouple input:
a.
Connect the piece of type J thermocouple lead wire, wired to the Sensor ve
terminals, to a thermocouple simulator.
. The simulator should be set to output a type J thermocouple signal.
. Twist together or jumper the piece of type J thermocouple lead wire to the Hi-
Limit T/C terminals. This creates a junction and prevents a hi-limit sensor error
[H-T/C ERR] caused by an open thermocouple. Press the Reset key to clear a
hi-limit sensor error [H-T/C ERR] caused by an open thermocouple.
. Adjust the simulator to supply a 250° F signal. Wait for 30 seconds while the
control stabilizes.
22. Press the following key sequence: -, -, +. The display now reads SCAL 450.
37
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
Adjust the simulator to supply a 450° F signal. Wait for 30 seconds while the
control stabilizes.
Press the following key sequence: +, +, -. The display now reads SENS 450.
To verify proper calibration, adjust the simulator to supply a 350° F signal. Within
30 seconds, the display should stabilize and read SENS 350.
Press the Manual key. The display reads [MANUAL] If the control did not
calibrate properly repeat steps 12 - 25.
Press the Power on pushbutton to de-energize oven.
Disconnect AC power to the oven.
Remove Protocol™ controller to expose thermocouple inputs terminals.
Disconnect the two pieces of type J thermocouple lead wire connected to the
Control T/C and Hi-limit T/C terminals.
Re-connect control and Hi-Limit thermocouples to the controller thermocouple
terminals (Control T/C, and Hi-limit T/C).
Re-install the Protocol™ controller onto the oven.
Re-connect AC power to the oven.
Press the Power on pushbutton to energize oven.
Press the Tune key. The display reads [TUNE |.
Reset any tune mode parameters that were changed in step 12 to perform
calibration (examples: DEG = F and CZO = 0.0).
When changes have been completed, press the Manual key. The display reads
[MANUAL 1.
The calibration procedure is complete.
38
Calibration Recovery
The Protocol control has a factory calibration recovery feature. This feature allows the
operator to restore the Protocol to an operational condition should a calibration error
occur. The Factory Calibration Recovery feature should only be used as a temporary
fix until a proper calibration procedure utilizing a calibration source can be performed.
Only a complete calibration will restore the Protocol to an optimum performance level.
— For proper calibration instructions refer to the calibration section of this manual.
Instructions
1. Select the Diagnose mode by pressing the DIAG key.
2. Press the Y (down arrow) key until RCVR SEN is displayed.
3. To recover the control sensor calibration value, press the key sequence +, -, -, +, -,
+
4. Press the Y (down arrow) key until RCVR HIL is displayed.
5. To recover the high limit sensor calibration value, press the key sequence +, -, -, +,
- +.
The calibration recovery is now complete.
39
Diagnostics Mode
The diagnostics mode is provided to give certain relative information about Protocol™.
The following table gives an outline of the diagnostics mode.
DIAGNOSE Select Diagnostics mode.
SSR Protocol™ SSR output level.
EVENTS Events 1-3 follow
E-1 Event 1 output
E-2 Event 2 output
E-3 Event 3 output
| SENS-T/C Control thermocouple display follows
GOOD Control thermocouple test and input reading
HL - T/C Hi-limit thermocouple display follows
GOOD Hi-limit thermocouple test and input reading
PWR % output
RCVR SEN Recover factory calibration for control sensor
RCVR HIL Recover factory calibration for high limit sensor
ltems that can be adjusted by the user include SSR (ON or OFF), Events E-1, E-2 and
E-3(ON or OFF) and PWR. The SSR and PWR items can be used to test the solid
state relay for proper operation. The SSR item allows the SSR to output 100% (ON) or
0% (OFF). The PWR item allows for adjustable output from 0% to 100%. to
implement, adjust the PWR level with the +/- keys and turn on the heater relay.
RCVR SEN and RCVR HIL are used to restore the factory calibration should a
calibration error occur. |
40
Power Failure
In the event that the power supplied to Protocol™ is insufficient at any point during a
running mode, the display will read PWR-FAIL. in the tune mode the user can choose
the Power Fail Recovery mode from Stop, Resume and Hold. To restart after a power
failure in the hold mode, press the Start key to resume oven operation. Otherwise,
press the Reset key to clear the PWR-FAIL display. Do not shut off the power during a
running mode. This creates an error condition and PWR-FAIL will be displayed the
next time Protocol™ is powered up. Instead, press the Stop key and the Heater Off
key. This will power off Protocol™ without creating an error condition. |
Power Failure
In the event that the power supplied to Protocol™ is insufficient at any point during a
running mode, the display will read PWR-FAIL. In the tune mode the user can choose
the Power Fail Recovery mode from Stop, Resume and Hold. To restart after a power
failure in the hold mode, press the Start key to resume oven operation. Otherwise,
press the Reset key to clear the PWR-FAIL display. Do not shut off the power during a
running mode. This creates an error condition and PWR-FAIL will be displayed the
next time Protocol™ is powered up. Instead, press the Stop key and the Heater Off
key. This will power off Protocol™ without creating an error condition.
41
Programming Examples and Outline
The following examples show a step by step procedure
for programming Protocol™ in the Manual, Timer and
Program modes. Example 1 covers the Manual mode
and example 2 covers the Timer mode. A detailed
outline covers the Program mode with a programming
worksheet and examples 3-5 following the outline.
Example 1 - Manual Mode
Control the process at 250°F.
le
Manual MANUAL Select Manual mode
| Hi-Limit Enter the high limit temperature
| HL 200 High limit temperature currently set at 200°F
0 HL 275 Increase high limit temperature to 275°F
| SETPOINT Enter the setpoint
| 180 75 Setpoint at 180°F, actual oven temperature at 75°F
0 250 75 Increase setpoint to 250°F
| READY Protocol™ is ready to run Manual mode
Heater On | READY Heater relay initiated, heater ready for power
Start 250 75 Setpoint = 250°F, actual oven temperature = 75°F
Stop READY Stop Manual mode
Heater Off | READY Heater relay LED is off, heater secured off
42
Example 2 - Timer Mode
Control the process at 200°C for three hours and 15
minutes with the timer beginning at 195°C.
Protocol™ will stop automatically when run in Timer
mode.
Timer Mode Exam
le _
e: uu Lod! SO
Timer TIMER Select timer mode
| Hi-Limit Enter the high limit temperature
| HL 225 Hi-Limit currently set at 225°C
- HL 215 Decrease high limit to 215°C
| SETPOINT Enter the setpoint
| 210 25 Setpoint at 210°C, actual oven temperature at 25°C
- 200 25 Decrease setpoint to 200°C
! TIME0010 Timer currently set for ten minutes
+ TIMEO315 Increase timer to three hours and 15 minutes
| TEMP NO Timer currently set to begin timing at ambient
+ TEMP YES Timer set to begin timing at the following temperature
| TEMP 79 Timer currently set to begin timing at 79°C
+ TEMP 195 Timer set to begin timing at 195°C
| READY Protocol™ is ready to run Timer mode
Heater On READY Heater relay LED on, heater ready for power
Start 200 25 Setpoint = 200°C, actual oven temperature = 25°C
Stop READY Stop Timer mode
Heater Off READY Heater relay LED is off, heater secured off
43
Program Mode
Pro
PROGRAM
“Hi-Limit
HL
PROFILES
PRO-
SEG-
RAMP
E-1
E-2
E-3
TEMP
SOAK
EVENTS
mmm
WKN —
SOAK-DEV
+/-
GOTO
REPEAT
TIMES
HOLD
YES
NO
ram Mode Outline
EVENTS
Sb
ВЕ
Select Program mode.
Hi-Limit for Program mode
Enter high limit temperature (+ or - keys).
Enter profile number (1-8).
Segment number of profile (1-6)
Ramp time entered
Event status for ramp time
Event 1 status (ON or OFF)
Event 2 status (ON or OFF)
Event 3 status (ON or OFF)
Ramp ending temperature
Soak period of ramp ending temperature
Event status for soak period
| Event 1 status (ON or OFF)
Event 2 status (ON or OFF)
Event 3 status (ON or OFF)
Soak-Deviation limit for profile (Also assured soak limit)
Enter soak-deviation limit.
Enter profile to GOTO
End = Move to REPEAT TIMES command
1 = GOTO profile 1
2 = GOTO profile 2
8 = GOTO profile 8
Enter number of recursions (1-99)
1 = Execute profile 1 times
2 = Execute profile 2 times
99 = Execute profile 99 times
Hold at last setpoint?
Hold at last setpoint indefinitely.
Holds event outputs at last value.
No hold at last setpoint.
Event outputs turn OFF.
44
Notes on the Program mode.
The profile number is manually entered using the + or - keys.
Six segments exist for each profile.
If the ramp time and soak time for any one segment is zero, Protocol™ ignores the
remaining segments. |
The REPEAT TIMES command is the number of times to execute the profile being
programmed.
The HOLD command is contingent on the final segment of the last profile to be run
only.
A soak time will not begin until the actual temperature is within the soak-deviation
limit. (Assured soak limit).
Make sure the proper starting profile number is displayed in the PRO- prompt
before executing the profile to be run.
While a program is being executed, pressing the Reset key will display the profile
number, segment number and the number of loops (REPEAT TIMES) remaining.
Pressing the Start key will display the appropriate ramp or soak time remaining (TR.)
If Protocol™ is in a HOLD condition, pressing the Reset key will display that the control
is in segment 7 (HOLD.)
45
Program Worksheet
Temperature (°C)
0 1 2 3 4 5 6
Time (minutes)
Figure 7. Sample Profile
The program worksheet serves as a guide to the input parameters for the program
mode.
Display Setting(s)
HL
PRO-
| RAMP
E-1
E-2
E-3
TEMP
SOAK
E-1
E-2
E-3
SOAK-DEV
GOTO
REPEAT TIMES
HOLD
46
Example 3 - Program Mode
130 - —_—
120 +
Hold
110 -
100 В
90 -
Temperature (CC)
80.
10- |
О 20 30 40 50 60
Time (minutes)
Figure 8. Example Temperature Profile
Follow the characteristic curve listed below.
Display Setting(s)
HL
PRO-
SEG-
RAMP
E-1
E-2
E-3
TEMP
SOAK
E-1
E-2
E-3
SOAK-DEV
GOTO
REPEAT TIMES
HOLD
47
Example 4 - Program Mode
Cool time to cool oven to
below 212 °F before shutdown
250 -
= 200-
в
5 150 + A
a,
8 100 1
H
50 :
0 | | 1 | | |
O 1 2 3 4 5 6 7 8 9 10 11
Autostart the oven after two hours and follow the characteristic curve below.
Time (minutes)
Figure 9. Example, Temperature Profile
Display Setting(s)
HL 240
PRO- 1
SEG- 1 2 3 4 5 6
RAMP 0001 0100 0030 0100 0100 0030
E-1 OFF ON ON ON ON ON
E-2
E-3
TEMP 70 130 160 130 220 100
SOAK 0200 0030 0100 0100 0200 0000
E-1 OFF ON ON ON ON OFF
E-2
E-3
SOAK-DEV 5
GOTO End
REPEAT TIMES 1
HOLD No
48
Example 5 - Program Mode
100--——
90 -
O 80 -
о
Е 70 -
g 604
5
= 20% 3 3 4
Time (hours)
Figure 10. Example, Temperature Profile
Complete characteristic curve five times.
Display Setting(s)
HL 115
PRO- 1
SEG- 1 2 3 4
RAMP 0100 0200 0000
E-1
E-2
E-3
TEMP 100 50 50
SOAK 0100 0001 0000
E-1
E-2
E-3
SOAK-DEV 10
GOTO End
REPEAT TIMES 5
HOLD No
Troubleshooting
Equipment which operates for long periods of time may develop problems. Below are
possible problems and suggested solutions. If you have a problem not listed and do
not know what to do, contact Despatch Industries at our toll free Help Line 800-473-
7373.
Failure to heat
No power
Broken or frayed cord
Burned out heater
Protocol ™ malfunction
Loose wire connections
Check power source and/or oven and wall
fuses.
Replace with new cord.
Replace heater (see warranty.)
Replace controller.
Disconnect power and check connections be-
hind control panel.
Slow heat up
Improperly loaded
Low line voltage
Heating element(s) are
burned out
240 volt oven is connected to
a 208V line
Fan motor failure
Reduce load or redistribute load in chamber.
Supply sufficient power and proper connections.
Check for circuit overload.
Replace burned out element (see warranty
statement.)
Raise line voltage to a 240 volt line.
Replace fan motor.
Frequent heater
element out
Harmful fumes generated by
load
Spillage or splattering of
material on heater elements
Increase vent opening or discontinue process.
Disconnect power and clean oven chamber and
elements.
Check the Hi-limit.
Overheating oven
50
Erratic temp. or
inaccurate temp.
Protocol™ malfunction
Improper tuning parameters
ProtocoiTM miscalibration
Replace Protocol ™.
Check tuning parameters.
Recalibrate Protocol™ (see section on Calibra-
tion mode.)
Hi-limit setting Hi-limit should be 10-25°C higher than setpoint.
Improper offset Check calibration zero offset.
Excess surface or | Door seal deterioration Replace door seal.
door temp.
Improper airflow Fan motor failure Replace fan motor.
Unbalanced fan wheel Replace fan wheel.
Excessive Dirty fan wheel Clean fan.
vibration
Unbalanced fan wheel Replace fan wheel.
Oven will not Hi-limit set too low Set the Hi-limit higher
control at setpoint
Protocol malfunction
SSR malfunction
Air friction of recirculation fan
Replace control.
Replace SSR and/or check control output
voltage.
Open exhaust air vent. Unit will not control
below minimum operating temperature with vent
closed. -
Heater does not
shut down until
temp. reaches the
Hi-limit setting
Protocol malfunction
SSR malfunction
Replace Protocol
Replace SSR
51
Accessories
The ovens have options that can easily be field installed.
Accessories
Te
Recorder kit | The round chart recorder follows the temperature changes and
records them for permanent record.
Door switch | Disables heater when the door is opened.
Extra shelves
Stands This support frame includes one open shelf.
Base These steel, 22 inch high cabinets are painted to match the
cabinets ovens. The cabinets store supplies and hold workloads. A
magnetic latch secures the door. Standard Despatch shelves
fit in the cabinets. shelves for base cabinets must be ordered
separately.
Stacking kit | Allows ovens to be stacked to save space. Kit includes angles
mounted on top of the lower oven to stabilize the upper oven
(LFD 1-42 only).
The above items can all be field installed. For further information on these items or
other available options, please contact your Despatch representative.
52