DTS 3000 Series Cooling Units

DTS 3000 Series Cooling Units
ELECTRO-TECHNOLOGY FOR INDUSTRY
DTS 3000 Series
Cooling Units
Installation, Operation and Service Manual
Safety for man, machine and the environment®
TABLE OF CONTENTS
SECTION 1: HOW TO USE THIS MANUAL...........1
SECTION 2: RECEIVING INSPECTION.................2
2.1 Unpacking............................................................ 2
2.2 Included Items.................................................... 2
2.3 Review of ID Plate................................................ 2
SECTION 3: HANDLING.......................................3
3.1 Transporting........................................................ 3
3.2 Storage................................................................. 3
SECTION 4: INSTALLATION.................................3
4.1 Pre-installation testing....................................... 3
4.2 Installation onto the electrical panel................. 3
4.3 Power connection................................................ 4
4.4 Door contact........................................................ 5
SECTION 5: OPERATING CONDITIONS...............5
5.1 Requirements...................................................... 5
5.3 Condensation Consideration.............................. 6
SECTION 6: UNIT START-UP................................7
6.1 General................................................................. 7
6.2 Fault indicator / LED Display............................... 7
6.3 Test Mode / Start-up............................................ 8
6.4 Door Contact........................................................ 8
6.5 Setting the Operating Parameters..................... 8
SECTION 7: MAINTENANCE................................9
7.1 General Maintenance.......................................... 9
7.2 Cleaning............................................................... 9
SECTION 8: TROUBLESHOOTING.................... 10
8.1 Verifying Normal Function...............................10
8.2 Fault Condition..................................................10
8.3 Error Codes.........................................................11
SECTION 9: DESIGN DATA................................ 12
9.1 SCCR Determination..........................................12
SECTION 10: WARRANTY INFORMATION....... 14
DTS Series Cooling Units
SECTION 1: HOW TO USE THIS MANUAL
This manual contains information on the installation
and operation of DTS 3000 Series bolt-on cooling
units intended to be door and side mounted on
electrical panels.
Conventions used:
Hint: A hint contains additional information on the
action or instruction being described
WA R N I N G !
If the information following this is not strictly
followed there is a danger to health or life.
WA R N I N G !
If the information following this is not strictly
followed there is a danger to health or life
due to electrical shock.
­­
The technical data specific to each cooling unit
including installation connections and operational
data are contained on a separate data sheet.
1
SECTION 2: RECEIVING INSPECTION
2.2 Included Items
The following items should be included:
Cooling unit
Mounting cutout
Manual
Technical Data Sheet
2.1 Unpacking
Prior to and during unpacking the cooling unit,
visually inspect it to determine if any damage has
occurred during shipping. Make sure that it does not
contain any loose components. Before discarding
any packaging materials: Look for loose parts, dented
or scratched panels or fluids.
DTS 3000 Series accessory pack typically includes:
• Sealing strips
• Threaded mounting studs
• Mounting bolts, nuts and washers
• Condensate hose
• Door contact connector/jumper
If any damage is noted it shall be reported
immediately to the delivering carrier and a claim
should be filed with them. Pfannenberg cannot
accept responsibility for freight damage that may
occur; we will assist you in any way possible if the
need arises to file a claim.
2.3 Review of ID Plate
The ID plate is located on the left side of the
cooling unit. The technical data specific to
the cooling unit is located on the ID plate as
shown below.
In case of a warranty claim, the following information
is required: exact details of the fault (including
photographs, if possible), the cooling unit part
number and serial number are required.
WA R N I N G !
Burrs caused by production may be present
on the metal edges of the cooling unit. Always
wear protective gloves when carrying out
installation or maintenance work.
Cooling Part #
Frequency
Nominal
Voltage
Nominal
Current
Power
Consumption
Serial #
Design
Pressure
Refrigerant
Charge
Cooling
Capacity
Heating
Capacity
Environmental
Conditions
Fusing
2
DTS Series Cooling Units
SECTION 3: HANDLING
SECTION 4: INSTALLATION
3.1 Transporting
The cooling unit shall only be moved in the fully
assembled, upright condition.
4.1 Pre-installation testing
Before mounting the cooling unit to the electrical
panel enclosure it should be tested to verify function.
If the cooling unit is being shipped with an electrical
panel enclosure it shall be packed separately from
the electrical enclosure.
4.2 Installation onto the electrical panel
Before connecting the cooling unit to the power
supply, verify that the following are correct.
Voltage must be within ± 10% of the value listed on
the ID plate.
WA R N I N G !
If for any reason the cooling unit has been
placed in any position other than fully upright
it shall be placed in a vertical position for a
minimum of 1 hour prior to starting the unit. If
this is not done the compressor may be drained
of oil. Operation of the compressor without
proper oil fill may cause permanent damage to
the cooling unit and void the warranty.
3.2 Storage
The cooling unit shall not be exposed to
temperatures exceeding +70ºC. Store the unit fully
assembled in the fully upright condition.
WA R N I N G !
Failure to observe these requirements
will void the warranty.
Voltage frequency must be within ± 3 Hz of the value
listed on the ID plate
Ambient temperature must be below +55ºC (for
options see “setting the operating parameters”
section)
Place the drilling template supplied with the cooling
unit onto the applicable mounting surface of the
electrical panel enclosure.
WA R N I N G !
Metal chips from drilling and cutting the openings
may damage the electrical panel enclosure. Take
precautions required to prevent chips and debris
from getting into the enclosure.
WA R N I N G !
Watch out for sharp edges created when drilling
and/or cutting the enclosure.
Drill holes in the electrical panel enclosure to
match the unit and cut out air flow openings.
Remove the cooling unit cover for handling during
installation by removing the cover mounting screws.
Install the two supplied stud bolts (in the accessory
pack) into the top two mounting hole locations of
the cooling unit.
WA R N I N G !
Please note the information on the “Thread
Reach for Set Screw” label attached to the
cooling unit. If the noted installed thread depth
is exceeded the cooling unit may be damaged.
Install the cooling unit mounting insulation strips (in
3
the accessory pack) to the cooling unit as noted on
the individual cooling unit information sheet.
Make sure that the insulation strips are correctly
attached and placed correctly on the cooling unit.
The correct fitting and location of the insulation
strips is required for the proper operation of the
cooling unit.
Attach the cooling unit to the electrical panel
enclosure by use of the stud bolts inserted as
described above.
WA R N I N G !
Do not move the cooling unit by the piping.
Doing so will damage the cooling unit and
void the warranty.
required, shall only be carried out by authorized,
trained electricians.
WA R N I N G !
The cooling unit may be damaged due to
compressor rotating in the incorrect direction.
On three phase connection (400V/460V)
units the power supply connections are
phase sensitive. Make sure that the power
connections are correct or the cooling unit will
not operate properly.
Power supply connection
All units are provided with either a molded cord
or permanent connection internal to the unit.
permanent connection must be secured to the
cooling unit by means of a cable strain relief.
The cooling unit is then completely attached to the
electrical panel enclosure from inside the enclosure
by use of the screws and washers supplied in the
accessory pack.
Tighten the fasteners until the cooling unit insulation
strips are compressed to a thickness of 2 mm
(approx. .080”)
Install the condensate drainage hose to the drain
located in the cooling unit base.
Reinstall the cover using the original mounting
screws.
4.3 Power connection
WA R N I N G !
Make sure that the main power supply to the
cooling unit is turned off while making the
power connections.
The cooling unit power supply shall be fused as
indicated on the unit ID plate by means of a series
connected power line connection. A temperature
control can not be connected in series with the
cooling unit power supply.
Both the main power supply voltage and frequency
shall correspond to the nominal values shown on the
cooling unit ID plate.
WA R N I N G !
The cooling unit may be damaged if the supply
voltage is too high.
This refers to cooling units with (460V / 400V)
multiphase connections.
All power connections and / or repairs, if or when
4
DTS Series Cooling Units
As an option, the control voltage can be adjusted to
match the main power supply. Internal to the unit, a
voltage jumper is provided to adjust the transformers
incoming voltage. See technical data sheet included
with cooling unit.
Connect the main power supply to the cooling unit as
indicated by the label located on the cooling unit and
on the individual cooling unit data sheet.
WA R N I N G !
During installation, service technician must
verify and mark voltage as connected on
service cover warning sticker.
Terminal Connections:
4.4 Door contact
To avoid an increased production of condensate
and for safety reasons a door limit switch should be
connected to the terminals provided. The power
supplied to these terminals from the cooling unit is
low voltage (<20V, 20mA).
WA R N I N G !
No external voltage may be applied to the door contact
circuit or damage to the cooling unit may result.
In order to prevent any interference from outside
signals, it is recommended that a shielded cable with
a twisted pair leads be used for the connection. The
cable shielding can be connected on one side to the PE
(ground) connection point provided on the cooling unit.
If the use of a shielded cable is not possible, the cable
that is used must not be routed in the immediate
vicinity of potential sources of interference such as
power supply lines , components with a relatively high
electromagnetic emission (EMI), etc.
SECTION 5: OPERATING CONDITIONS
5.1 Requirements
Before connecting the cooling unit to the power
supply, verify that the following are correct.
Voltage must be within ± 10% of the value listed on
the ID plate.
Voltage frequency must be within ± 3 Hz of the value
listed on the ID plate
Ambient temperature must be below +55ºC (for
options see Section 6.5)
If it ever becomes necessary for servicing, use only the
refrigerant specified on the ID plate and genuine spare
parts only or damage to the cooling unit may result.
Before mounting, make sure that the cooling unit will
have proper ventilation for operation. The cooling unit
must have at least 200mm of clearance between it and
any other surface.
Make sure that the airflow inside of the electrical panel
enclosure is not restricted by internal components.
Enclosure
Cooling
Unit
8”
(200 mm)
Wall
If no door contact switch is used, the connecting
terminals must be jumpered for the cooling unit to
operate.
Centralized fault indicator option
To connect the fault signal line there are two
connection terminals available (see the connecting
diagram on the label of the individual cooling unit).
The signal of a fault in the cooling unit is displayed by
the breaking of a potential-free contact.
WA R N I N G !
These connection points may be connected to a
live electrical line with a maximum of 230V, 2 A
5
WA R N I N G !
If the cooling unit is being mounted on the door of
the electrical panel enclosure, it must be confirmed
that the door hinges can support the additional
weight of the cooling unit and that the electrical
panel enclosure is securely fastened so that the
panel enclosure will not topple over.
enclosure and pushes it through the evaporator
(4) and back into the electrical panel enclosure at a
lower temperature.
5.2 Theory of Operation
∞
∞
The cooling unit is electronically controlled. To
accomplish this a temperature sensor monitors the
temperature inside the electrical panel enclosure
and regulates the function of the cooling unit.
The refrigerants used in the cooling unit are noncombustible and are minimally detrimental to the
atmosphere.
1 Compressor
2 Heat exchanger (condenser)
3 Expansion valve/ capillary line
4 Heat exchanger (evaporator)
5 fan, exterior circulation
6 fan, inner circulation
7 Electronic control system with temperature sensor
The compressor (1) compresses the refrigerant
until it becomes a high pressure gas. During the
compression process, the temperature of the
refrigerant gas increases.
As the refrigerant in the form of a high pressure, high
temperature gas flows through the condenser (2)
the refrigerant cools and condenses as the heat is
dissipated to the ambient (outside of the electrical
panel) air.
This is accomplished by the condenser fan (5) pulling
in ambient air into the housing and then pushes
the ambient air through the fin and coils of the
condenser (2) and back out of the housing and into
the ambient environment at a higher temperature.
5.3 Condensation Consideration
During operation, the moisture in the air inside of
the electrical panel enclosure condenses on the fins
of the evaporator and is collected as condensate.
In order to avoid any damage to the electrical
panel enclosure contents or to the cooling unit, the
condensate must be removed from the cooling unit.
The condensate is removed as follows: The
condensate drains into a condensate tray located
at the bottom of the cooling unit and is evaporated
into the ambient air by means of an electrical
heating element.
The free discharge of any accumulated condensate
must be provided for to ensure trouble-free
operation of the cooling unit.
The PTC-heater starts heating immediately on the
application of power to the cooling unit. The PTCheater is self-controlled and it’s temperature will
vary depending on the level of condensate in the
condensate tray.
As the now liquid refrigerant passes through the
expansion valve (3) the pressure drops and the
refrigerant becomes a liquid / gas mixture.
As the refrigerant in the form of a liquid / gas passes
through the evaporator (4) it absorbs the heat
from air in the electrical panel enclosure while also
dehumidifying it.
This process lowers the temperature of the air in the
electrical panel enclosure
This is accomplished by the evaporator fan (6)
pulling in the hot air from the electrical panel
6
DTS Series Cooling Units
SECTION 6: UNIT START-UP
WA R N I N G !
HOT SURFACE
Even if there is no condensate in the condensate
tray the PTC-heater will be on at a low output.
In the case of excessive condensate
drainage the condensate tray located at
the bottom of the cooling unit may fill with
condensate which is then drained away by
means of a hose connection.
WA R N I N G !
If there is excessive condensate formation
during normal operation, check the electrical
panel enclosure seals.
We recommend that a door contact switch be
installed to turn off the cooling unit when the door
to the electrical panel enclosure is opened in order
to prevent excessive condensate formation.
6.1 General
The cooling unit is equipped with an electronic
control system. The temperature of the air pulled in
from the electrical panel enclosure into the cooling
unit is measured by a temperature sensor.
WA R N I N G !
Ambient conditions and temperatures
in the electrical panel must be in accordance
with the values indicated in the cooling unit
information sheet.
WA R N I N G !
Unit must be operated with the cover installed.
Unit can not cool properly when cover
is not in place.
Immediately after the main power is turned on for
the cooling unit, the unit goes into its start-up / test
mode.
6.2 Fault indicator / LED Display
The cooling unit has an operational display in
the form of an LED located either on the rear of
the cooling unit or on the external hood of the
cooling unit.
If the indicator light remains on when the power
supply is turned on, it means that the cooling unit is
in its normal operating mode. If a fault is detected
or if the cooling unit is in its start-up / test mode, the
LED will flash in a fault code that can be used to help
diagnose the problem.
7
6.3 Test Mode / Start-up
The start-up / test mode is activated whenever
the unit has had power removed and re-applied.
While in this mode the cooling unit operates
independently from the ambient conditions when
the door contact is closed.
The cooling unit runs through a start up sequence
that takes approximately 30 seconds to accomplish.
The start-up mode is also activated whenever the
door limit switch is closed.
Modus
Start-up
Mode
Time Curve
t = 0s - < 30s
t = 30s
t = 32s
Characteristics
No function.
Internal fan start up.
External fan and compressor start up.
Flashing sequence of the
status indicator:
"off-dark-light-dark-off".
Fault signal contact is closed.
Self Test
during Start
t > 34s - 64s
The location of the DIP switch is on the cooling unit
control board as shown on its circuit diagram.
The coding options are represented on the
circuit diagram.
The circuit diagram and / or display image are to
be found on the inside of the service cover of
the cooling unit or on the individual cooling unit
information sheet.
See the cooling unit information sheet for
additional details.
WA R N I N G !
Changes to the operating parameters
of the cooling units should only be made
by authorized personnel.
Compressor and fans remains in
operation during the period.
Flashing sequence of the status indicator: "off-dark-light-off".
Fault signal contact is open.
Should a fault arise during the test
mode, the unit goes into the fault
mode and the status indicator lights
up according to the fault state (See
Section 8.1)
6.4 Door Contact
For safety reasons and to prevent an increased
output of condensate, a door limit switch should be
connected to the terminals provided on the cooling
unit. (see the wiring diagram on the individual
cooling unit or on the individual information sheet
supplied with the cooling unit.
With the switch in place, when the electrical
panel enclosure door is opened (thereby opening
the switch) all of the cooling unit motors are
immediately turned off. When the electrical panel
enclosure door is closed, the cooling unit start-up
mode begins and is run through which ensures a
restart-up of the cooling unit with a time lag.
6.5 Setting the Operating Parameters
Various electrical panel enclosure temperatures as
well as the limit temperatures can be selected by
means of a DIP switch on individual cooling units.
8
DTS Series Cooling Units
SECTION 7: MAINTENANCE
7.1 General Maintenance
WA R N I N G !
Disconnect the cooling unit from the power
supply before any cleaning or maintenance.
The cooling unit is largely maintenance free.
The cooling circuit is a maintenance free hermetically
sealed system. It has been filled at the factory with
the required refrigerant amount, checked for leakage
and run through a series of functional tests before
being shipped.
The components around the external air circuit require
periodic cleaning and maintenance depending on
the environmental conditions.
7.2 Cleaning
The cleaning intervals depend upon the relevant
operating conditions. In particular, observe the
following instructions:
• Disconnect the cooling unit from the power supply
• Remove the external cover
• Clean the heat exchanger regularly using a soft
brush or pressurized air
• It is recommended that the condensate run off
opening be checked regularly
WA R N I N G !
Damage to the heat exchanger possible.
Do not use any sharp or pointed object to
clean the condenser heat exchanger.
The heat exchanger fins should not be bent,
compressed or damaged in any way during
the cleaning process.
If the cooling units are provided with a filter, clean
the filter mat regularly. The cleaning intervals or the
intervals for replacement of the filter mat mainly
depends upon environmental conditions (air quality.)
You can rinse the filter mat using water heated to
40° C and commercially available mild detergent.
It is possible to remove any dirt by knocking the mat
slightly, vacuum cleaning it or blowing it out.
9
If the filter mat is oily or greasy, please replace.
SECTION 8: TROUBLESHOOTING
8.1 Verifying Normal Function
Environmental conditions may eliminate the need for cooling. If the door contact circuit (X54) is opened then
closed the unit will perform it's test function. This will cause all the components to activate and the unit will
provide cooling for a short time. (See below.)
If cooling does not occur, please review the troubleshooting topics listed below.
Modus
Time Curve
Characteristics
Start-up
Mode
t = 0s - < 30s
t = 30s
t = 32s
No function.
Internal fan start up.
External fan and compressor start up.
Flashing sequence of the status indicator: "off-dark-light-dark-off". Fault signal contact is closed.
Self Test
during
Start
t > 34s - 64s
Compressor and fans remains in operation during the period.
Flashing sequence of the status indicator: "off-dark-light-off".
Fault signal contact is open.
Should a fault arise during the test mode, the unit goes into the fault mode and the
status indicator lights up according to the fault state.
NO DIP SWITCH CHANGES ARE REQUIRED.
8.2 Fault Condition
If a fault occurs, check the following points first. If the fault is then not cleared, call an authorized specialist.
Fault
Unit fails to cool.
Internal fan is running.
Unit fails to cool sufficiently.
Condensate accumulates
in switch cabinet.
Condensate fails to drain.
Possible cause(s)
Remedy
Temperature setting is above ambient.
Check temperature setting.
Required cooling capacity exceeds capacity of unit.
Check ambient temperature and internal load.
Dirty filter or condenser.
Clean condenser. Clean or replace filter.
Lack of refrigerant.
Call authorized technician. Check unit for leaks.
Internal and external fans not working.
Call authorized specialist. Check fan capacitors. Replace fans.
Ensure proper electrical connections.
Air not circulating properly inside the switch cabinet.
Check enclosure and air circulation inside enclosure. Air intake
and exhaust must be unimpeded by components.
Exiting temperature is too low.
Enclosure is not sufficiently sealed.
Condensate drain is clogged
Set cooling unit to a higher temperature setting.
Close enclosure door and improve the seal in the enclosure.
Clean condensate drainage. Condensate drainage hose must
be angled downward without showing a bend.
10
DTS Series Cooling Units
8.3 Error Codes
Unit Characteristics
Technical Causes
Fault Remedy
Compressor: Internal Fan: External Fan: Status LED: Fault signal contact:
ON
ON
ON
flashing (seq. 3)
open
The test mode of the unit is active. This mode is left
automatically at the latest after 60 s.
The unit switches to test mode once after each new
connection to the power supply. No remedy of fault
necessary.
Compressor: Internal Fan: External Fan: Status LED: Fault signal contact:
OFF
OFF
OFF
flashing (seq. 1)
closed
The input for the door limit switch is open - e.g. as a
result of a switch cabinet door not closed or a bridge
not set.
Insert link, close door contact switch, or with an
engaged door contact switch, close the door.
Compressor: Internal Fan: External Fan: Status LED: Fault signal contact:
OFF
ON
OFF
flashing (seq. 2)
open
High pressure pressostat or motor protection switch
has responded (overheating). Compressor switches on
again automatically after the fault has been remedied
(cooling) with a delay of 30 s.
Clean filter mat or heat exchanger in the external
circulation. Possibly check the power dissipation in the
switch cabinet to the installed cooling capacity of the
cooling unit.
Compressor: Internal Fan: External Fan: Status LED: Fault signal contact:
ON
ON
ON
flashing (seq. 1)
open
The upper temperature limit (T L2) of the switch cabinet
has been exceeded.
Clean filter mat or heat exchanger in the external
circulation. Possibly check the power dissipation in the
switch cabinet to the installed cooling capacity of the
cooling unit.
**Sequence 1: (User Error)
***Sequence 2: (Unit Fault)
****Sequence 3:
(Test/start-up mode)
11
SECTION 9: DESIGN DATA
rating of the control panel. The link
to spreadsheets provide guidance for industrial
control panel manufacturers who purchase the
discreet components and assemble combination
motor controllers within their panels to achieve a
combination short circuit rating that is higher than
the lowest rated individual component.
Please refer to the cooling unit individual
technical data sheets for the following:
Dimensional Data
Mounting Cutout
Circuit Diagrams
9.1 SCCR Determination
Article 409 of the 2005 National Electric Code (NFPA
70) requires Industrial Control Panels (electrical
panel enclosures) to be marked with a short circuit
current rating. As specified in the National Electric
Code, the Standard for Industrial Control Equipment,
UL508A-2001, Supplement SB, provides an accepted
method for determining the short circuit current
(3) 15A
Class CC
Fuses
Table 1
Room cooling units rated-Load Current, Amperage
3 Phase3
Single Phase3
110 - 120 V
100kA
9.9
Branch
200 - 208 V
Using the technical data sheet and the information
on the cooling unit ID plate, identify the full load
current conditions for the appropriate voltage. The
installation of the cooling unit should be calculated
as a dedicated branch circuit for determining the
SCCR value. All selections should be evaluated based
on the current UL standards for UL508a.
220 - 240 V
Marked
8.8
SCCR-5
kA 5.0
50 KA
Peak
Let-thru
Current2
Max
Fuse1
Ip x 103
Less
1000
15
50 KA
254 - 277 V
440 - 480 V
8.0
6.65
Less
1.8
16.0
5.4
16.1
34.0
8.9
18.6
8.1
17.0
---
---
---
---
2000
30
50 KA
---
---
---
---
---
---
---
---
Over
1.8
5000
15
50 KA
100 KA
Max
Fuse1
Ip x 103
200 KA
Max
Fuse1
Ip x 103
n/a
n/a
15
100 KA
n/a
30
100 KA
30
200 KA
Maximum CC class Fuse size that can achieve this branch circuit SCCR value. Smalller values may be used and still achieve equal rating.
2
Circuit capacity amperes based on UL 484 table 52.1
3
Individual units running amperes can be obtained on each unit's technical data sheet.
1
1.5 HP
Example 2: DTS 35xx 460V units has a 5KA IR value based on UL 484 table 52.1 (see Table 1) and the amp draw of
the unit. If a 15amp Class CC current limiting feeder circuit is used in combination with the DTS35xx 460V unit,
the maximum allowable Ipeak of the 15 amp Class CC fuse at an available RMS fault current of 200 kA is 1700
amps (figure 2). This value does not exceed the allowable Ipeak of this unit based on UL SCCR value of Table 52.1.
Threrefore, the individual branch circuit SCCR value of this series combination can support 200 kA IR. (See figure 1.)
Figure 2
12
DTS Series Cooling Units
Figure 1
Option 3: UL 508a reference SB4.2
The combinations listed in the linked spreadsheets
(www.ul.com/controlequipment/shortcircuit.html)
may be applied in a manufacturer's Listed industrial
control panel without further evaluation or specific
documentation in the manufacturer's UL Procedure
pages.
(3) 15A
Class CC
Fuses
100kA
Branch
Marked
SCCR-5 kA
1.5 HP
Option 1: UL 508a reference SB4.2
According to UL508A Supplement SB, if a panel
contains no current-limiting devices, its SCCR
depends on the “weakest” or lowest rated
component or combination within the panel.
However, Supplement SB also states that if currentlimiting fuses are used in the feeder circuit, and if the
highest instantaneous current reached during the
first half cycle of a fault is less than or equal to the
lowest rated SCCR in any branch circuit, the SCCR
of the current limiting fuse can be applied to the
combination.
When the specified branch circuit protection related
to the high fault short circuit current rating is a Class
CC,G,J,L,RK1, RK5 or T fuse, a fuse of a different class
is able to be used at the same high fault rating where
the peak let through current and I2t of the new fuse
is not greater than that of the specified fuse.
Option 2: UL 508a reference SB4.3
An alternate method of achieving a high short circuit
rating is by applying a power transformer with an
isolated secondary winding, the short circuit current
rating on the line side of the transformer shall be one
of the following:
For a power transformer rated not more than 10
kVA, and where the short circuit current rating of
all components in the secondary circuit are not
less than 5kA, the short circuit current rating of the
primary overcurrent protective device is able to be
assigned to the line side of the power transformer
circuit.
For a power transformer rated not more that 5kVA
and a 120V maximum secondary voltage, and where
the short circuit current rating of all components in
the secondary circuit are not less than 2kA, the short
circuit rating of the primary overcurrent protective
device is able to be assigned to the line side of the
power transformer circuit.
13
The spreadsheets cover the application of individual
components, including a disconnecting means, an
over current protective device, motor controller
and motor overload protection, as a combination
motor controller having specified ratings, including
a short-circuit current rating (SCCR). Each of the
individual components is Listed or Recognized to the
requirements in the applicable component Standard.
The specified ratings for the combination motor
controller may be applied to the end-product
equipment only when all of the specific components
listed are provided in the end-product equipment
and installed according to any applicable conditions
of acceptability.
Components other than those identified in the
combination motor controller and connected in the
power circuit of the combination motor controller
will require additional evaluation.
SECTION 10: WARRANTY INFORMATION
(WARRANTY IS VALID FOR 1 YEAR)
Warranty becomes null and void:
In case of improper usage of the unit, noncompliance
with operating conditions or nonobservance of
instructions the warranty becomes null and void.
If operated in rooms in which corrosives or acids are
present in the atmosphere.
In case of damage caused by contaminated or jammed
air filters.
If a non-authorized person interrupts the cooling
circulation, modifies the unit or changes the serial
number.
In case of damage caused by transport or by accidents.
For the exchange of parts by non-authorized
companies.
In order to maintain your warranty rights please
observe the following when returning the unit.
Enclose an exact description of the fault in the shipping
package.
Enclose proof of delivery (delivery note or copy of
invoice).
Return the unit together with all accessories; use the
original packaging or packaging of equivalent quality,
send the unit freight prepaid and covered by an
adequate transport insurance.
14
ELECTRO-TECHNOLOGY FOR INDUSTRY
Pfannenberg Incorporated
68 Ward Road, Lancaster, New York 14086
Phone: 716-685-6866
Fax: 716-681-1521
email: [email protected]
www.pfannenbergusa.com
Org 05/09
© 2009 Pfannenberg Incorporated
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