Despatch LAC2-18-4> Owner's Manual

 ern
P/N 116088
REV. 9/94
C96
US $15.00
LAC Series Despatch Ovens are bench ovens to 260°C (500°F) with forced convection airflow.
Model Volts Heater watts Amps HZ Phase
LAC 1-10 120 1,000 10.0 50/60 1
LAC 1-38A 120 1,600 16.0 50/60 1
LAC 1-38B 240* 1,800 9,2, 50/60 1
LAC 1-67 240" 2,400 11.7 50/60 1
LAC 2-12 240" 3,600 18.1 50/60 1
LAC 2-18 240* 4,800 23.1 50/60 1
* Unit will operate on a 220V-1Ph-50Hz line. A kit is required for 240V-1Ph-50Hz operation.
Unit will operate on 208V with a 25% reduction in heater output.
Dear Customer,
Thank you for choosing Despatch Industries. We appreciate the
opportunity to work with you and to solve your heat processing
needs. In addition, 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 satisfactory
completion.
Whenever you need service or replacement parts, just contact the
Response Center at 1-800-473-7373: FAX 612-781-5353,
Thank you for choosing Despatch.
Sincerely,
Despatch Industries
This manual is your guide to the Despatch oven. It is orga-
nized 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 func-
tion and operation of assemblies and subassemblies on the
Despatch oven.
The INSTRUCTIONS section provides directions on un-
packing, installing, operating and maintaining the Despatch
oven.
The APPENDIX section contains Special Instructions for
operating the control instrument, a Troubleshooting 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 corresponding oven
control system. This will give you practical hands-on experi-
ence with information in the manual and the oven.
While reading this manual, if a term or section of informa-
tion is not fully understood, look up that item in the appro-
priate section to familiarize yourself with that item. Then go
‘ back and reread that section again. Information skipped, not
understood or misunderstood could create the possibility of
operating the equipment in an unsafe manner. This can
cause damage to the oven or personnel or reduce the effi-
ciency of the equipment.
Page i
PREFACE .
| Despatch LAC Series Instruction Manual
800-473-7373 C-96
HE:
Table of Contents .....0000000000000 000000004 U
List of Illustrations .......oecoccrorereeorre e. Y
List of Tables .......oorroccreorerere carece. Y
INTRODUCTION 440444000000 00000000
Special Features .......00000000000000000 000000]
Specifications .....e.ereorerrorerrerrecorered
Dimensions ....... _errssrecccocccorecrrrd
Capacities .......eerenorercrrrrererrerer ed
Temperature ........ooreororeorrrrrerrered
Power .......eo0.oreorrreeccarerero rare.
THEORY OF OPERATION .....ñorencrcreressere3
Damper Control ..........e0eserererercirrr.D
Determining Damper Settings .........e......6
Protocol™ .......o exe0c0e0resrreecaoveorrerereoB
Keypad Controls .........ece0creorócrecrre 9
Status Indicator LEDs .....................10
Operating Modes .....0.0.00000000000000000 10
Calibration Zero Offset ..............0.... 12
Tune Setting .......o_eocrreoocororecaccar a
Protocol TM Hi-imit .........oreocsocooooor 14
INSTRUCTIONS .......e.ereovcorocovrerererre 19
Unpacking and Inspection ....................15
Setup .......r_ererecrorererrre.rerrerercr 1Ó
Operating .......eoeoserceorererec.e re ees 1
Loading the Oven .......re0.0c0reorecorecre lO
PreStart-Up Checklist .........eeereconvrcor 18
Start-Up .......eeceoreorerr re rrenrese 19
Maintenance 000004000000 000000000000 29
Checklist 0000000000000 000029
Tests 111104100000 3
Replacement .....e.ereserererrcrererreres JO
APPENDIX .......eo -reccorecorecreocoreeco.. 3D
Special Instructions ,.......e.rescrerererere: 39
Control Instrument.......eoeeeoeeererccoo. 3
Programming Examples and Outline ..........45
Troubleshooting .........eoecmercorecareoo.D3
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Drawings ......eeoecoarecrrrerere reses e: DÓ
LACI1-10 .........reesovccrorecoracare» DÓ
Material List .........oeereovccoorereo
Page ii
PREFACE
Despatch LAC Series Instruction Manual HELP-LINE
C96 | 800-473-7373
Communication Option and Options List ... 57
LACI1-38A ......ñeoocordarcanccccooer e». DO
Material List .......... ener. . 59
Communication Option and Options List . ... 99
LACI1- 38B * + * >» e + | AA + * о * #* $ + * + * + + + ++ 60
Material List .......0.00000000000000000, 61
Communication Option and Options List ... 61
LAC1-67 2000000000002
Material List ........oo reonccorcorereo. 03
Communication Option and Options List ... 63
LAC2-18 ........o_orrcorccorecerecone. 64
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Communication Option and Options List ... 67
Page iii
PREFACE
я E Despatch LAC Series Instruction Manual
800. 0473. 7373 C-96
Figure 1 illustrates the precision horizontal airflow. ...... 5
Figure 2 illustrates the main display and key pad on the
Despatch Protocol™ temperature controller. . . . . г... В
Figure 3 illustrates the CZO function in the tune mode of
ProtocolTM, ,,... J 000 12
Figure 4 illustrates the control panel on the LAC Series oven.
eee ee 19
Figure 5 shows the top view of the J type thermocouple in- |
puts on ProtocolTM, ,......._...recorecerreco. 31
Figure 6 shows the top view of the J type thermocouple in-
puts on ProtocolTM, ........e.._reesvrecrreceo. 38
Figure 7 illustrates a sample profile. ..............e.. 49
Figure 8 illustrates an example temperature profile. ..... 50
Figure 9 illustrates an example temperature profile. ..... 51
Figure 10 illustrates an example temperature profile. . . . . . 52
Table 1 Dimensions .......oorcéoceocsrcorooorrecomo 2
Table 2 Capacities .....000000000 00000000000 ..
Table 3 Temperature ......ñoecocciorrorresccooe ee. 3
Table 4 Power Requirements .........eoeeece0ossove.. 4
Table 5 Protocol TM Keypad Controls .........ee-eee... 9
Table 6 Protocol TM Touchkeys.........orrocorvooe. 9
Table 7 ProtocolM Indicator LEDs ......ñ.oreconveoo 10
Table 8 Calibration Zero Offset Examples ............ 13
Table 9 Factory PID Settings ..........reererevreo 13
Table 10 Tuning Outline ..........ec0oo.eeoscrere, 36
Table 11 Tune Mode Parameter Calibration .......... 39
Table 12 Diagnostics Mode Outline ................ 43
Table 13 Manual Mode Example .................. 45
Table 14 Timer Mode Example .........r.oeoe... ... 46
Table 15 Program Mode Outline ........e..rerecco. 47
Table 16 Accessories. .......r_ro_recoorcoosoooerer e. 55
Page iv
PREFACE
Despatch LAC Series Instruction Manual |
C96
This section provides an overview of the Despatch Classic™
LAC Series forced air oven. The LAC Series Ovens have the
most effective heat distribution and the fastest processing time
of any lab oven its size. Air is discharged from the left side
wall of the oven and circulates through the chamber.
The sturdy construction and three inch insulation of the
Despatch LAC Series ovens contribute to excellent tempera-
ture uniformity.
Despatch LAC Series ovens also incorporate a modular
microprocessor based digital control. The Despatch Proto-
col” temperature controller features:
+. PID tuning
- programmable up to 48 segments
e builtin manual reset Hi-limit control
+ builtin process timer
e self-diagnostics
o. digital display
e three (3) event outputs
recursive profile capabilit
« RS-422/RS-485 capability
800-473. 137373
Page 1
INTRODUCTION
Despatch LAC Series Instruction Manual -
C-96
Other special features include the following.
Unique Despatch design to combine higher far volume
of forced recirculated air with a system of perforated
stainless steel walls for the ultimate in temperature uni-
formity. |
Welded double wall construction and fiberglass insula-
tion 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.
Space-saving, stackable design.
1-10 14 | 12 | 12 1 23 | 21 | 29.5 5 1 |
(35) | (30) | (30) | (31) | (58) | (53) | (75)
1-38A | 19 | 18 | 19 | 38 28 | 28 | 365 8 2
(48) | (46) | (48) | (106) | (71) | (1) | (93) |
1388 | 19 | 18 | 19 | 3.8 28 | 28 | 36.5 8 2
| (48) | (46) | (48) | (106) | (71) | (71)| (93)
1-67 | 24 | 20|24| 67 36 | 30 | 445 | 11 2
(61) | (51) | (61) | (190) | (1) | (76) | (106)
212 | 24 | 24 | 36 | 12 36 | 33 | 53.5 | 17 2-24
(61) | (61) | (91) | (340) | (92) | (84) | (136)
218 |355| 24 | 36 | 18 48 | 31 | 535 | 17 2-24
(90) | (61) | (91) | (500) | (122) | (79) |_ (136)
Page 2
INTRODUCTION
Despatch LAC Series. Instruction Manual
C-96
Maximum Load
Exhaust
Recirculating Fan
Approx. Weight Net
Shipping Weight
Lbs
Maximum Shelf Load Lbs
CFM
CFM
H.P.
Lbs
KG
Lbs
KG
100
50
Adjustable
to 5
150
1/25
95
43
115
52
125
25
Adjustable
to 12
300
YA
165
75
200
91
150
25
Adjustable
to 12
300
Ya
203
92
400
181
175
25
Adjustable
to 30
600
Vax?
285
130
535
243
200
25
Adjustable
to 40
600
14x2
500
227
720
327
Table 3 Temperature
Time to Temperature 25°C -100°C | 8 7 5 5 6
(approximate minutes 25°C -200°C | 25 25 20 20 10
with no load) 25°C -260°C | 40 40 35 35 | 35
Recovery Time - Door Open 100°C 1 2 2 2 2
One Minute (approximate 200°C | - 4 1 6 6 5
minutes with no load) 260°C 9 12 8 12 8
Temperature Uniformity at 100°C* | £1°C +1°C
200°C* | £2°C +2°C
260°С* | +2°С +3°С
Operating Range with 20°C Ambient 35°C - 260°C 50°C -260°C
Control Stability +0.3°C
Repeatability +0,5°C
* Figures are based on actual tests in an empty oven.
Uniformity can vary slightly depending on unit and
operating conditions.
INTRODUCTION
Despatch LAC Series Instruction Manual
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 of the electrical components such as
relays, temperature controls, etc. may operate erratically.
Included, 15 Amp
Included, 20 Amp
Included, 15 Amp
Included, 15 Amp
None, Hardwired
‘None, Hardwired
LAC 1-10 120 | 10.0 50/60
LAC 1-38A 120 | 16.0 50/60
LAC 1-38B* | 240 9.2 50/60
LAC 1-67" 240 | 11.7 50/60
LAC 2-12* 240 | 18.1 50/60
LAC 2-18" 240 | 23.1 50/60
The LAC 2-12 and LAC 2-18 must be hardwired to the
electric supply using 10 AWG or larger wires suitable for at
least 75°C (167°F).
00 ON «E 00 С |
Oven designed for 240 volts (see name plate on oven)
will operate satisfactorily on a minimum of 208 volts,
but with a 25% reduction in heater power. If your
power characteristics are lower, contact Despatch
Industries.
** A kit is required for 240V - 1PH - 50Hz operation.
Standard 240V units will operate on a 220V - 1 PH -
50 Hz line.
Page 4
INTRODUCTION
Despatch LAC Series Instruction Manual
C96
800-473-7373
This section details the function and operation of assemblies
and subassemblies on the Despatch Classic™ LAC Series
Ovens. These ovens have the most effective heat distribution
system and the fastest processing time of any lab oven its size.
They are especially useful for testing, preheating, sterilizing,
drying, aging and curing as well as other production applica-
tions. Horizontal airflow with precision digital control
delivers uniform, fast processing. The overall result is
efficient productivity under strenuous conditions.
Exhaust
Port
Fresh Air
Figure 1 illustrates the precision 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 LAC
Series Ovens employ higher volume fans than any competi-
tive model. The chamber can be densely loaded without
interfering with the process. Air delivery temperature is
within 1°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
port, on the back of the oven, is covered by a hat bracket.
Page 5
THEORY OF OPERATION
Despatch LAC Series Instruction Manual
C96
The oven is equipped with a manually adjustable damper
mechanism. The damper control arm is located on the front
panel of the oven. The damper adjustment controls the flow
of fresh air into the chamber. If the damper is in the full
open position, the maximum amount of fresh air is distrib-
uted into the chamber. If the damper is in the fully closed
position, no fresh air is distributed into the chamber.
To determine the optimum setting for the amount of fresh air
that should be distributed into the chamber depends on
several factors. These factors include ambient environment
temperature, load conditions, load distribution, heat up rates,
cool down rates, desired temperature uniformity and most
importantly the desired operating temperature, To consider
all of these variables at any one point in time is not practical
and there are engineering tradeoffs that should be consid-
ered. Therefore guidelines should be used to determine the
fresh air damper setting.
In general, the damper should be set so that the amount of
fresh air flowing into the chamber agrees with the desired
operating temperature conditions. The following outline
shows the considerations involved with various damper
position settings.
When the fresh air damper is in the full closed position, the
chamber will be able to achieve the maximum attainable heat
up rates for the chamber. In addition, the chamber will use
the minimum amount of power to operate at the desired
temperature. In almost all cases, the fresh air damper should
be in the full closed position in order to efficiently operate at
the maximum operating temperature for the chamber.
Page 6
THEORY OF OPERATION
Despatch LAC Series Instruction Manual
C96
When the fresh air damper is in the full open position, the
chamber will be able to operate at its minimum operating
temperature. Without the damper set to the full open posi-
tion, the chamber has no way to readily dissipate the heat
generated from the electronics compartment primarily due to
the recirculation fan motor. Since the recirculation fan motor
is mounted below the workspace, most of the heat generated
from the running motor rises into the chamber. Therefore,
the chamber temperature will rise slightly even though the
heating system is not turned on. The result is that after the
recirculation motor has been on for an extended period of
time, the chamber will reach a thermal equilibrium tempera-
ture. With the fresh air damper fully open, the thermal
equilibrium temperature is the minimum operating tempera-
ture of the chamber. |
The damper can be set to several other distinct operating
positions. In most cases, the damper setting is influenced by
two specific performance factors. The two performance
factors are uniformity and cool down rates.
The uniformity of the chamber is influenced by the inside
chamber pressure of the system. The pressure inside the
chamber is dependant on the amount of fresh air flowing
into the chamber. When a large volume of fresh air is flow-
ing into the chamber, the chamber becomes slightly pressur-
ized and the overall temperature uniformity improves. The
slightly pressurized chamber produces the effect of "pushing"
the air to the corners of the chamber. Typically, the corners
of the chamber will improve with respect to temperature
distribution while the core of the chamber will maintain
excellent uniformity characteristics regardless of the damper
position. Therefore, the pressurization of the chamber typi-
cally is a factor when the chamber is loaded heavily. In any
case, the best uniformity results with respect to the product
are achieved when no more than two-thirds of any inside
chamber dimension are used. In other words, when the
product(s) are located in the center of the chamber, the best
overall results are achieved.
Page 7
THEORY OF OPERATION
Despatch LAC Series Instruction Manual
C96
The ovens are equipped with a modular microprocessor
based digital temperature controller.
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tps
Figure 2 illustrates the main display and key pad on the Despatch Protocol™ temperature
controller. |
The Despatch Protocol™ temperature controller is a dual
functioning controller/high limit instrument. The control
portion of Protocol™ incorporates a microprocessor to digi-
tally 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 param-
eter should be set to a value slightly higher than the highest
programmed setpoint to protect the oven equipment.
Page 8
THEORY OF OPERATION
Despatch LAC Series Instruction Manual HELP-LINE
C96 | 800-473-7373
The Despatch Protocol™ temperature controller has six keys
that provide the six operating modes. |
Table 5 Protocol™ Keypad Controls
Manual MANUAL Operation | Single setpoint control
Timer TIMER Operation | Single setpoint control with process timer
Program PROGRAM | Operation | Programmable control 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 control-
ler.
Table 6 Protocol™ Touchkeys
Î To move up through any mode
| 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
Page 9
THEORY OF OPERATION
E E - Despatch LAC Series Instruction Manual
800-473-7373 C96
Protocol™ has seven indicator LEDs that provide the follow-
ing relevant information to the user.
Table 7 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 speci-
fied 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.
Hi-limit 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.
Protocol™ has three primary modes of operation: the Manual
mode, the Timer mode and the Program 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 Powe
pushbutton, Protocol™ starts at the manual mode.
Page 10
THEORY OF OPERATION
. Despatch LAC Series Instruction Manual _
C6 800-473-7373
The timer mode is a single setpoint control mode with a
built-in process timer that starts timing either at the begin-
ning 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.
The program mode is a programmable ramp and soak con-
trol consisting of up to eight profiles. Each profile consists of
up to six segments for a total of 48 segments (8 x 6 = 48).
Also, 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 О 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 control:
ling relays, solenoid valves, etc., throughout the programming
cycle.
800-473. 37373
Page 11 -
THEORY OF OPERATION
Despatch LAC Series Instruction Manual
C-96
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.
Figure 3 illustrates the CZO function in the tune mode of
Protocol TM, |
The CZO may be useful to make the following small tem-
perature corrections to the control system.
e Correction of known sensor calibration errors.
e Correction of any known steady temperature offset be-
tween the heated work-piece (load) and sensor. This is
useful for applications where the sensor cannot be locat-
ed exactly at the work-piece.
e Alignment of temperature indications in a multi-
zone/multi-controller application, e.g., at ambient tem-
perature.
Note that the CZO changes the value of the controlled tem-
perature when used in closed loop control. The CZO func-
tion 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 (°C)]
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.
Page 12
THEORY OF OPERATION
Despatch LAC Series Instruction Manual
C-96
800-473-7373
A more useful formula is one that the user can use to cali-
brate Protocol TM 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:
CZO = 100
| Center Temp (°F) - Protocol™ Display (°F)
CZO = 100
Center Temp (°F) - 100 (°F)
Center Temp (°C) - Protocol TM Display (°C)
Center Temp (°C) - 38 (°C)
|
)
|
The Protocol TM has been preset and tested for normal oper-
ating conditions. Special instructions for changing the tune
setting are referenced in the Appendix of this manual.
The Protocol TM 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.
Table 9 Factory PID Settings
Proportional Band
Reset Time
Rate Time
5°C
30 seconds/repeat
O degrees/second
Page 13
THEORY OF OPERATION
Despatch LAC Series Instruction Manual
C96
Protocol™ will not let the high limit value to 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 deacti-
vating the heater.
Page 14
THEORY OF OPERATION
Despatch LAC Series Instruction Manual
C-96
The INSTRUCTIONS section provides directions on un-
packing, installation, operation and maintenance of the
Classic™ LAC Series oven.
Remove all packing materials and thoroughly inspect the
oven for damage of any kind that could have occurred during
shipment,
o
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, and it could have happened during ship-
ment follow these instructions.
1.
Contact the shipper immediately and file a written dam-
age claim.
Contact Despatch Industries to report your findings and
to order replacement parts for those that were damaged
or missing.
Send a copy of your filed damage claims to Despatch.
Next, check to make sure you have received all the re-
quired materials. Your shipment should include:
One (1) Despatch oven,
o One (1) Instruction manual,
o One (1) Warranty card,
* Two (2) Shelves
e One (1) Package containing four rubber feet
800. 0473. 7373
| Page 15.
INSTRUCTION
Despatch LAC Series Instruction Manual
C-96
5. If any of these items are missing from the packaged
contents, contact Despatch Industries to have the appro-
priate materials forwarded to you.
6. Finally, to protect the warranty on your new LAC Series
Oven, complete the warranty card and mail it to Des-
patch within 15 days after receipt of the equipment.
1. Remove adhesive backing sheet from the rubber feet.
2. Attach rubber feet to the bottom corners of the oven.
3. Place oven on a bench top or an optional cabinet base.
The oven must have a minimum of two (2) inches clear-
ance in the rear to provide proper ventilation. The oven
may be placed next to another cabinet, or next to anoth-
er oven, with three (3) inch clearance (the doors will still
open).
Make sure oven is level and plumb; this will assure
proper heat distribution and operation of all mechanical
components.
4. Identify correct power source indicated on the specifica-
tion plate.
5. Plug or hardwire oven directly to the electric supply.
Page 16
INSTRUCTIONS
Despatch LAC Series Instruction Manual
C96
800-473-137
3
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, as well as 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.
Despatch Industries cannot be responsible for either the
process or process temperature used, or for the quality of the
product being processed. It 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 assist
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 may cause the load to
heat unevenly and the weight may cause shorting out of the
heater elements. Use the shelves provided.
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 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,
Page 17
INSTRUCTION
Despatch LAC Series Instruction Manual
C96
Know the system. Read this manual carefully. Make
use of its instructions and explanations. The know how
of safe, continuous, satisfactory, trouble-free operation
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 name-
plate requirements of motors and controls. Refer to the
section on power connections in the INTRODUC-
TION of this manual. |
Fresh air and exhaust. Do not be careless about restric-
tions in and around the fresh air and exhaust openings
and stacks. Under no condition permit them to become
so filled with dirt that they appreciably reduce the air
quantity. The proper ventilation clearances should be
fulfilled at all times. Refer to the Setup instructions in
this manual.
7 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.
e For drying ovens, open vent to prevent buildup of
moisture.
e For sample heating, close the vent when no ventila-
tion is required.
Page 18
INSTRUCTIONS
Despatch LAC Series Instruction Manual | р
C96 | 800-473-7373
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 Appen-
dix. A completed typical program worksheet accompanies all
programmable event outputs installed at the factory.
1, Start Fan.
a. Open oven door.
b. Press Power on pushbutton. You will hear the
recirculating fan start.
c. Shut oven door.
d. Check that the green Power on LED is on.
OPERATING INSTRUCTIONS
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Figure 4 illustrates the control panel on the LAC Series oven.
2. Program Protocol for the desired operating mode.
"Refer to the following instructions for the Manual mode,
the Timer mode and the Program mode.
| INSTRUCTION
Despatch LAC Series Instruction Manual
The following ate startup instructions for the Manual mode.
1. Select the Manual mode.
” MANUAL Lil be displayed.
2. Enter the high limit temperature.
a. Press the ! key. HLLIMIT will be displayed.
b. Press the ! key.
c. Use the + or - keys to enter the high limit tempera-
ture to a value slightly higher than the intended set-
point.
3. Enter the setpoint.
a. Press the | key. SETPOINT will be displayed.
b. Press the | key
c. Use the + or - keys to enter the Setpoint to the de-
sired operating temperature.
The following are run instructions for the Manual mode.
1. Press | key. READY will be displayed.
2. Press the Heater on key. The Heater Relay LED
will illuminate.
and the setpoint and actual temperature will be dis-
played. As oven temperature approaches setpoint, the
Heater on LED will cycle on and off,
Page 20
INSTRUCTIONS
Despatch LAC Series Instruction Manual
C96
HE
1. Press He
shut off.
2. Wait for oven temperature to fall below 100°C (212°F).
3, When Manual mode is complete, press the R
to display the final process temperatures.
set key
5, Press Power on pushbutton to turn power off.
An example of the Manual mode is referenced in the Ap-
pendix.
Page 21
INSTRUCTION
HELP E Despatch LAC Series Instruction Manual
800-473-7373 C-96
The following are start-up instructions for the Timer mode.
1. Select the Timer mode.
a. Press the Timer key. TIMER will be displayed.
2. Enter the high limit temperature.
a. Press the ! key. HI-LIMIT will be displayed.
b. Press the ! 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 ! key. SETPOINT will be displayed.
b. Press the ! key.
c. Use the + or - keys to enter the setpoint to the desired
operating temperature.
4. Enter the process time.
a. Press the ! key. TIME will be displayed.
b. Use the + or - keys to enter the time of the process.
(HHMM (hours/minutes) or MMSS (minutes/ sec-
onds) selected in the tune mode).
Page 22
INSTRUCTIONS
Despatch LAC Series Instruction Manual | | |
C96 - 800-473-7373
Start-up (Co nt.)
5. Enter timer starting temperature.
a. Press the | 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.
o Press the + key to display YES and begin timing
at the following input temperature.
c. Press the | key. TEMP and the begin timing tem-
perature 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.
The following are run instructions for the Timer mode.
1. Press the | 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 illumi
nate 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.
Page 23
INSTRUCTION
г E Despatch LAC Series Instruction Manual
800. 0473. 7373 C96
Manually S
The
following are manual stop instructions for the Timer
mode.
5.
Press the Heate
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 Ste D key.
ower on pushbutton to turn power off.
An example of the Timer mode is referenced in the Appen-
dix of this manual.
Page 24 |
INSTRUCTIONS
Despatch LAC Series Instruction Manual
C-96
800-473-7373
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.
a. Press the Program key. PROGRAM will be dis-
played.
2. Enter the high limit temperature.
a. Press the | key. HI-LIMIT will be displayed.
b. Press the ! key. The high limit temperature will be
displayed.
c. Use the + or - keys to enter the high limit tempera-
ture to a value higher than the intended setpoints.
3. Enter the profile number.
a, Press the | key. PROFILES will be displayed.
b. Press the ! key. PRO - 1 will be displayed.
с. Use the + or - keys to enter the profile number to pro-
gram.
Page 25
~ INSTRUCTION
ELP Е Despatch LAC Series Instruction Manual
C96
4. Program the profile.
a. Press the | key. SEG - 1 will be displayed.
b. Program the ramp rate.
i Press the | key. RAMPO001 will be displayed.
ii. Use the + or - keys to enter the ramp time.
c. Program the events desired during the ramp time.
Press the | key. EVENTS will be displayed.
ii. Press the ! key for each event.
iii. 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 | key. TEMP and the ramp ending
temperature will be displayed.
ii. Use the + or - keys to enter the desired ramp
ending temperature.
e. Program the soak time.
i. Press the ! key. SOAK and the soak time will
be displayed.
ii. Use the + or - keys to enter the soak time.
f. Program the events desired during the soak time.
i Press the ! key. EVENTS will be displayed.
ii. Press the | for each event.
iii. Use the + or - keys to program the event ON or
OFF for the soak period.
Page 26
INSTRUCTIONS
Despatch LAC Series Instruction Manual | НЕГР
C-96 8
g. Enter the remaining segments 2-6 by following steps
a through f.
5. Enter the Soak-Deviation.
a. Press the | key until SOAK-DEV is displayed.
b. Press the | key. The symbol + will be displayed.
c. Use the + or - keys to enter the soak deviation limit.
6. Enter the next profile to continue to.
a. Press the | 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 profile. 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 ! key. REPEAT will be displayed.
b. Press the ! key. TIMES will be displayed.
с. 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 ! key. HOLD will be displayed.
- b. Use the + or - keys to select YES or NO.
e Selecting YES will hold at last setpoint. The
event outputs will be held at their last value.
event outputs will be turned off.
Page 27
| INSTRUCTION
HELP-LINE Despatch LAC Series Instruction Manual
800-473-7313 | C-96
HE
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 1 key until READY is displayed.
5 Press the Heater on key. The Hea
will illuminate.
ter Relay LED
6. Press the Start key. The H
nate. As the oven temperature approaches the setpoint,
the Heater on LED will cycle on and off. During pro-
cessing, the display shows the setpoint on the left and
the actual oven temperature on the right.
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).
4. Press Stop key.
5. Press Power on pushbutton to turn power off.
Examples of the Program mode are referenced in the Appen-
dix of this manual.
Page 28
INSTRUCTIONS
Despatch LAC Series Instruction Manual
C96
Do not attempt any service on this oven before opening the
main power disconnect switch.
» equipment clean. Gradual dirt accumulation re-
tards 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 unsatis-
factory work results. Keep all equipment accessible. Do
not permit other materials to be stored or piled against
it,
ly true of controls, motors or other equipment contain-
ing electronic components. Temperatures in excess of
51.5°C (1 25°F) should be avoided.
наити Ге ТР éhem fa Crh Y operaron
and maintenance will be more than paid for in continu-
ous, safe and economical operation.
Maintain equipment in good repair. Make repairs im-
mediarely. Delays may be costly in added expense for
labor and materials and in prolonged shut down.
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.
cated. All door latches, binges door operating mecha
nisms, bearing or wear surfaces should be lubricated to
ensure easy operation.
800- 0473. 1373
vainst excessive heat. This is particular-
Page 29
INSTRUCTION
Despatch LAC Series Instruction Manual
C-96
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 func-
tions of 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.
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,
the 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, just contact the Response
Center at 1-800-473-7373: FAX 612-781-5353.
Page 30
INSTRUCTIONS
Despatch LAC Series Instruction Manual
C96
(Tools needed: one quarter (14) 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 unplug-
ging the quick disconnect plug.
SIS 2 ole ©
Figure 5 shows the top view of the J type thermocouple inputs
on ProtocolTM,
800-473-1373
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.
Page 31
INSTRUCTION
Despatch LAC Series Instruction Manual
C96
(Tools needed: Crescent wrench, screwdriver, one quarter
(44) 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.
2. Disconnect the heater leads from heater element with a
wrench. Note which wires go on which terminals.
3. Unscrew the screws holding the heater frame to the oven
body.
4. Remove the heater and discard.
5, Screw down the new heater frame.
6. Attach the heater leads to appropriate terminals.
7. Replace the interior floor and screws.
Page 32
INSTRUCTIONS
Despatch LAC Series Instruction Manual
C96
(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 mo-
tor.
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. Some force may be required to
separate the fan wheel from the fan motor shaft.
Take the motor mounts off old motor.
Put the motor mounts onto new motor.
Page 33
INSTRUCTION
Despatch LAC Series Instruction Manual
C-96
10.
11.
12.
13.
14.
15.
16.
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.
Replace the oven bottom.
Turn the oven right side up.
Adjust the fan wheel for 3/16 inch clearance between
the wheel and the inlet ring.
Tighten the set screws on the fan wheel.
Check that the set screws hit the flats machined into the
motor shaft.
Replace the floor plate.
Page 34
INSTRUCTIONS
Despatch LAC Series Instruction Manual
C96
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.
Various functions of the control instrument are set by pa-
rameters 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 | 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
I = seconds/repeat
D = degrees/second
Page 35
APPENDIX
Despatch LAC Series Instruction Manual
C-96
Re utlin e
O
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
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 (ADDRJ 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 nor-
mal conditions are not present.
Page 36
APPENDIX |
Despatch LAC Series Instruction Manual HELP-LINE
C-96 | | 800-473-7373
rameters. To enter the tune mode, press Tune. TUNE will
be displayed. Press | and enter + - - + - + Using the |
key and the + or - keys, enter the desired settings. Press
Home when finished.
ing Factory Setting Units
5 degrees
30 seconds/repeat
0 degrees/second
C °F (°C)
SPL - 343 °F (°C)
CZO - 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 experimen-
tation is required to determine optimum settings.
Reset times greater than 35 seconds/repeat are not recom-
mended.
ProtocolTM 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.
800. 0473 1373
Раре 37
APPENDIX
Despatch LAC Series Instruction Manual
C96
Calibi Ss ions
We recommend using a certified analog thermocouple
simulator/calibration source with less that £1 °F noise. We
have experienced signal stability problems with some
micro-processor based thermocouple simulator/calibrators
which induce an error during the calibration procedure. This
error generally results in a non-linear shift i in the controller's
indicated temperature.
15. Disconnect AC power to the oven.
16. Remove Protocol™ controller to expose thermocouple
input terminals.
17. Disconnect control and hi limit thermocouples from
Sel = OIE
Figure 6 shows the top view of the J type thermocouple
inputs on Protocol TM,
18. Mark thermocouple leads if not labeled.
19. Connect a 6 foot piece of type J thermocouple lead wire
to each of the Control T/C and Hi-limit T/C
terminals.
20. Twist together or jumper the lead wire end not
connected to the Control T/C and Hi-limit T/C
terminals. This create 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.
21. Loosely fasten the Protocol™ controller to the oven.
22. Re connect AC power to the oven.
23. Press the Power On pushbutton to energize oven.
Page 38
APPENDIX
Despatch LAC Series Instruction Manual
C96 | 800. 0473. 7373
Calibration Instructions (C O nt.)
24. Press the Tune
key. The display reads [TUNE |.
25. Use the y and 4 keys to scroll through the tune mode
configuration. The controller must be configured to
operate in °F (Fahrenheit) and CZ0 should be set to
zero (0.0).
a. Record initial tune mode parameters prior to making
any changes.
b. Press the v key. The display reads [CODE El,
c. Press the following key sequence: +, -, -, +, +, +.
The display reads [PID TUNE]. Protocol™ is in the
tune mode.
d. Use the following table to change the tune mode
parameters.
Table 11 Tune Mode Parameter Calibration
32°F to 932°F
v key [1-1 HH 30 + or - keys 0 to 999 seconds/ repeat
v key |D-1 #H## 0 + or - keys 0 to 999 degrees/ second
v key [DEG - C Cc — |+ key for Cor - key for :
EF. .
v key |SPL - ### maximum de- + or - keys 0°C to 500°C
signed operating 32°F to 932°F
temperature!
v key |CZO - ##.# can vary + or - keys to change 99.9 to 99.9 degrees
parameter to 0.0 |
v key [DIS HHMM + key for HHMM
HHMM | (hours and minutes) or
the - key for MMSS
(minutes and seconds).
v key | BEEP ON ON + key for ON or the -
key for OFF,
! 204°C/400°F, 260°C/500°F, 343°C/650° F
Page 39
APPENDIX
Despatch LAC Series Instruction Manual
C-96
e. Press the Manual key. The display reads
[MANUAL 1.
£. Allow the controller a thirty (30) minute warm up
time before proceeding to the step #13 - CAL
MODE.
26. Press the Cal key. The display reads [CAL-MODE].
27. Press the v key. The display reads [CODE ***].
28. Press the following key sequence: +, -, -, +, -, +.
The display reads [HCAL HH],
29. To calibrate the control, press the ¥ key. The display
reads [SCAL HH, |
a. Connect the piece of type J thermocouple lead wire,
wired to the Control T/C terminals, to a
thermocouple simulator.
b. Set the simulator to output a type J thermocouple
— signal.
c. Twist together or jumper the piece of type ]
thermocouple lead wire, wired 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.
d. Adjust the simulator to supply a 250°F signal.
e. Press and hold the - key for approximately three (3)
seconds until display indicates 250. If display
indicates 932, continue to step f. However, you
should verify that the display indicates 250 on step h.
f. Adjust the simulator to supply a 450°F signal.
g. Press and hold the + key for approximately three (3)
seconds until display indicates 450.
h. Repeat steps d through g.
Page 40
APPENDIX
Despatch LAC Series Instruction Manual
C96
Calibration
instructions (Cont.)
30. To calibrate the hi-limit control, press the key. The
display reads [HCAL HHÍ.
a. Connect the piece of type J thermocouple lead wire,
wired to the Hi-limit T/C terminals, to a
thermocouple simulator.
—b. Set the simulator should be set to output a type J
thermocouple signal.
c. Twist together or jumper the piece of type J
thermocouple lead wire wired to the, Control T/C
terminals to create a junction and prevent 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.
d. Adjust the simulator to supply a 250* F signal.
e. Press and hold the - key for approximately three (3)
seconds until display indicates 250. If display
indicates 932, continue to step f. However, you
should verify that the display indicates 250 on step h.
f. Adjust the simulator to supply a 450°F signal.
g. Press and hold the + key for approximately three (3)
seconds until display indicates 450.
h. Repeat steps d through g.
i. Press the Manual key. The display reads
[MANUAL].
31. Press the P
ower (
32. Disconnect AC power to the oven.
33. Remove Protocol™ controller to expose thermocouple
inputs terminals.
800. 0473. 7373
Page 41
APPENDIX
— Despatch LAC Series Instruction Manual
C-96
Calibratio
ns (C
34. Disconnect the two pieces of type thermocouple lead
wire connected to the Control 1/6 mit T/C
terminals.
35. Re-connect control and hilimit thermocouples to the
с controller thermocouple terminals (Control T/C, and
36. Re-install the Protocol™ controller onto the oven.
37. Reconnect AC power to the oven.
38. Press the Powe
On pushbutton to energize oven.
key. The display reads [TUNE |.
40. Reset any tune mode parameters that were changed in
step 25. to perform calibration (examples: DEG = F and
CZ0 = 0.0).
41. When changes have been completed, press the Manual
key. The display reads [MANUAL |.
The calibration procedure is complete.
Page 42 -
APPENDIX
Despatch LAC Series Instruction Manual
C-96
800. 0473. 7373
\
The diagnostics mode is provided to give certain relative
information about ProtocolTM, The following gives an
outline of the diagnostics mode.
Table 12 Diagnostics Mode Outline
DIAGNOSE | Select Diagnostics mode.
SSR Protocol™ SSR output level.
EVENTS Events 1-3 follow
El | 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 Hilimit thermocouple test and input reading
PWR % output
SEN AD conversion code for control thermocouple
HIL AD conversion code for Hi-limit thermocouple
Items 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.
Page 43
APPENDIX
Despatch LAC Series Instruction Manual
C96
In the event that the power supplied to Protocol™ is insuffi-
cient 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 form Stop, Resime and Hold. To
restart after a power failure in the hold mode, press teh 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 condi-
tion and PWR-FAIL will be displayed the next time Proto-
col™ is powered up. Instead, press the Stop key and the
Heater Off key. This will power off Protocol™ without
creating an error condition.
Page 44
APPENDIX
Despatch LAC Series Instruction Manual
C96
HELP-LINE
800-473-7373
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 Pro-
gram mode with a programming worksheet and examples 3-5
following the outline.
Control the process at 250°F.
Manual
l
{
+
|
Heater On
Start
Stop
Heater Off
MANUAL
Hi-limit
HL 200
HL 275
SETPOINT
180 75
250 75
READY
READY
250 75
READY
READY
Table 13 Manual Mode Example
Enter the high limit temperature
High limit temperature currently set at 200°F
Increase high limit temperature to 275°F
Enter the setpoint
Setpoint at 180°F, actual oven temperature at 75°F
Increase setpoint to 250°F
Protocol™ is ready to run Manual mode
Heater relay initiated, heater ready for power
Setpoint = 250°F, actual oven temperature = 75°F
Stop Manual mode
Heater relay LED is off, heater secured off
Page 45
APPENDIX
Despatch LAC Series Instruction Manual
C96
Control the process at 200°C for three hours and 15 min-
utes with the timer beginning at 195°C. ProtocolTM will stop
automatically when run in Timer mode.
Table 14 Timer Mode Example
Timer TIMER Select timer mode
| Hi-limit Enter the high limit temperature
boo 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
Lo TIMEO0010 Timer currently set for ten minutes
+ TIMEO315 Increase timer to three hours and 15 minutes
bo 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.
Page 46
APPENDIX
Despatch LAC Series Instruction Manual HELP
C96 | 800-473-7373
Hi-limit
HL
PROFILES
PRO-
SEG-
RAMP
EVENTS
El
E-2
E-3
TEMP
SOAK
EVENTS
E-l
E-2
E-3
SOAK-DEV
+/-
GOTO
REPEAT
TIMES
HOLD
YES
NO
rogra
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
Despatch LAC Series Instruction Manual
Page 47
APPENDIX
C-96
Notes on the Program mode.
1. The profile number is manually entered using the + or -
keys.
2. Six segments exist for each profile.
3, If the ramp time and soak time for any one segment is
zero, Protocol™ ignores the remaining segments.
4. The REPEAT TIMES command is the number of times
to execute the profile being programmed.
5. The HOLD command is contingent on the final seg-
ment of the last profile to be run only.
6. A soak time will not begin until the actual temperature is
within the soak-deviation limit. (Assured soak limit).
7. Make sure the proper starting profile number is dis-
played 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).
Page 48
APPENDIX
Despatch LAC Series Instruction Manual
C-96
The program worksheet serves as a guide to the input pa-
rameters for the program mode.
Temperature CO)
0 1 2 3 4 5 6
Time (minutes)
Figure 7 illustrates a sample profile.
Display Setting(s)
HL
PRO-
SEG- 1 2 3 4 5 6
RAMP
E-1
E-2
E-3
TEMP
SOAK
E-1
E-2
E-3
SOAK-DEV
GOTO
REPEAT TIMES
HOLD
Page 49
| APPENDIX
P.LINE Despatch LAC Series Instruction Manual
3.737 C96
Follow the characteristic curve listed below.
130
120
110 -
100+
Temperature (°С)
vo
о
++ QO
© ©
Ot E
20 30 40 50 60
Time (minutes)
Figure 8 illustrates an example temperature profile.
Display Setting(s)
HL 150
PRO- 1
SEG- 1 2 3 4 5 6
RAMP 0020 0010 0010 0000
El
E2
E-3
TEMP 100 130 120 120
SOAK 0010 0010 0001 0000
El |
E2
E-3
SOAK-DEV 7
GOTO End
REPEAT TIMES 1
HOLD Yes
Page 50
APPENDIX
Despatch LAC Series Instruction Manual
C96
Autostart the oven after two hours and follow the character-
istic curve below.
Cool time to cool oven to
below 212 °F before shutdown
Temperature (F)
Un
©
|
3 4 5 6 7 8 9 10 11
Time (minutes)
Figure 9 illustrates an example temperature profile.
Display
HL
PRO-
SEG-
RAMP
E-l
E-2
E-3
TEMP
SOAK
E-1
E-2
E-3
SOAK-DEV
GOTO
REPEAT
TIMES
HOLD
800-473-7373
Setting(s)
1 2 3 4 5 6
0001 0100 0030 0100 0100 0030
OFF ON ON ON ON ON
_160
0100
ON
{0
0200
OFF
130
0030
ON
130
0100
ON
220
0200
ON
100
0000
OFF
Page 51
APPENDIX
Despatch LAC Series Instruction Manual -
C96
Complete characteristic curve five times.
100 -
90 -
80 -
70 -
60 -
Temperature CC)
50 у — ; y
Time (hours)
Figure 10 illustrates an example temperature profile.
Display Setting(s)
HL
PRO.
SEG- 1 2 3 4 5 6
RAMP 0100 0200 0000
E-1
E-2
E-3
TEMP 100 530 50
SOAK 0100 0001 0000
E-1
E-2
E-3
GOTO End_
REPEAT TIMES 5
HOLD NO
Page 52
APPENDIX
— Despatch LAC Series Instruction Manual | E =
C9 800-473-7373
Any equipment operating for as many hours a day are likely to have problems now and then. Be-
low 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.
Difficulty Probable Cause Suggested Remedy
Failure to heat No power Check power source and/or oven and wall fuses.
Broken or frayed cord Replace with new cord.
~ Burned out heater
Protocol™ malfunction
Loose wire connections
Slow heat up
Low line voltage
Heating element(s) are
burned out
240 volt oven is connected
to a 208V line
Fan motor failure
Harmful fumes generated by
load
Frequent heater
element out
Spillage or splattering of
material on heater elements
Overheating oven
Replace heater (see warranty)
Replace controller
Disconnect power and check connections be-
hind control panel.
Impropetly loaded Reduce load or redistribute load in chamber.
Supply sufficient power and proper
connections. Check for circuit overload.
Replace burned out element (see
warranty statement, back page).
Raise line voltage to a 240 volt line.
Replace fan motor.
Increase vent opening or discontinue process.
Disconnect power and clean oven
chamber and elements.
Check the Hi-limit.
Page 53
APPENDIX
Despatch LAC Series Instruction Manual
C96
Difficulty
Erratic temp.
Inaccurate temp.
Probable Cause
Protocol™ malfunction
Improper tuning parameters
Protocol™ miscalibration
Hi-limit setting
Improper offset
Door seal
deterioration
Excess surface
or door temp.
Improper airflow Fan motor failure
Unbalanced fan wheel
Excessive Dirty fan wheel
vibration
Unbalanced fan wheel
Oven will not Hi-limit set too low
control at setpoint
Protocol ™malfunction
SSR malfunction
Air friction of
recirculation fan
Heater does not Protocol™ malfunction
shutdown until
temp. reaches the
Hi-limit setting SSR malfunction
Page 54
APPENDIX
Despatch LAC Series Instruction Manual
C-96
Suggested Remedy
Replace Protocol TM,
Check tuning parameters.
Recalibrate Protocol™ (see section on Calibra-
tion mode).
Hi-limit should be 10-25°C higher than set
point,
Check calibration zero offset.
Replace door seal.
Replace fan motor,
Replace fan wheel.
Clean fan.
Replace fan wheel.
Set the Hilimit higher.
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.
Replace Protocol™,
Replace SSR.
HELP-LINE
800-473-7373
The ovens have options that can easily be field installed.
Recorder kit
Table 16 Accessories
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
This support frame includes one open shelf.
Stands
Base cabi- These steel, 22 inch high cabinets are painted to match the
nets 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,
The above items can all be field installed. For further
information on these items or other available options, please
contact your Despatch representative.
HELP
800-473-7373
Page 55
APPENDIX
Despatch LAC Series Instruction Manual
C-96
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APPENDIX
Despatch LAC Series Instruction Manual
C-96
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Page 57
APPENDIX
Despatch LAC Series Instruction Manual
C-96
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Page 58
APPENDIX
Despatch LAC Series Instruction Manual
C-96
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Page 59
APPENDIX
Despatch LAC Series Instruction Manual
C-96
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Page 60
APPENDIX
Despatch LAC Series Instruction Manual
C96 |
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PLUG NUMBER
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H 1007775 | 1 [1800 watt heater
M [097273 | 1 |00.25 HP motor
IE 007471 1 FO30A2SP fuseblock
007609 1 250V 10 amp fuse
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CF | 015229 1 MU3AI cabinet fan —
1T 116082 1 15VA 240/208V transformer
1-2CR 1 30A 240V DPST relay (incl | in 116079)
SSR | 057345 1 50A solid state relay
C 105115 1 Power cord
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800. 0473 7373
Page 61
APPENDIX
Despatch LAC Series Instruction Manual
C-96
12
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Page 62
APPENDIX
Despatch LAC Series Instruction Manual ELP E
C96 800-473-7373
PB
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Pushbutton model EMF (inc. in 118320)
T/C
110629
JJ39008E-00-16Z-25048-2 T/C
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097273
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1F
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CF
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1T
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1-2CR
30A 240V DPST relay (incl in 116079)
SSR
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800-473-7373
Page 63
APPENDIX
Despatch LAC Series Instruction Manual
C-96
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Despatch LAC Series Instruction Manual - HELP-LINE
800-473-7373
C-96
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T/C | 110629 1 JJ39008E-00-16Z-25048-2 T/C
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IE 007471 1 FO30A2SP fuseblock
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Page 65
APPENDIX
Despatch LAC Series Instruction Manual
C96
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Page 66
APPENDIX
Despatch LAC Series Instruction Manual
C96
3.6KW
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Page 67
APPENDIX
Despatch LAC Series Instruction Manual
C-96