6-19
T-296
6.19 AUTOTRANSFORMER
If the unit does not start, check the following:
a. Make sure the 460 vac (yellow) power cable is
plugged into the receptacle (item 3, Figure 4-1) and
locked in place.
b. Make sure that circuit breakers CB-1 and CB-2 are in
the “ON” position. If the circuit breakers do not hold in,
check voltage supply.
c. There is no internal protector for this transformer
design, therefore, no checking of the internal protec-
tor is required.
d. Using a voltmeter, and with the primary supply circuit
ON, check the primary (input) voltage (460 vac).
Next, check the secondary (output) voltage (230
vac). The transformer is defective if output voltage is
not available.
6.20 CONTROLLER
6.20.1 Handling Controller
CAUTION
Do not remove wire harnesses from con-
troller unless you are grounded to the unit
frame with a static safe wrist strap.
CAUTION
Unplug all controller connectors before
performing arc welding on any part of the
container.
The guidelines and cautions provided herein should be
followed when handling the Controller/DataCORDER
module. These precautions and procedures should be
implemented when replacing the module, when doing
any arc welding on the unit, or when service to the
refrigeration unit requires handling and removal of the
controller.
a. Obtain a grounding wrist strap (Carrier Transicold
part number 07--00--304--00)and a static dissipation
mat (Carrier Transicold part number 07--00304--00.
The wrist strap, when properly grounded, will dissi-
pate any potential buildup on the body. The dissipa-
tion mat will provide a static-free work surface on
which to place and/or service the controller.
b. Disconnect and secure power to the unit.
c. Place strap on wrist and attach the ground end to any
exposed unpainted metal area on the refrigeration
unit frame (bolts, screws, etc.).
d. Carefully remove the Controller. Do not touch any of
the electrical connections if possible. Place the mod-
ule on the static mat.
e. The strap should be worn during any service work on
the controller, even when it is placed on the mat.
1
2
3
4
1. Controller Software
3. Controller
2. Mounting Screw
Programming Port
4. Test Points
Figure 6-26 Controller Section of the Control Box
6.20.2 Controller Trouble-Shooting
A group of test points (TP, see Figure 6-26) are provided
on the controller for trouble-shooting electrical circuits .
A description of the test points follows:
NOTE
Use a digital voltmeter to measure ac voltage
between TP’s and ground (TP9), except for
TP8.
TP2
This test point enables the user to check if the internal
protector for the compressor motor (IP-CP) or high
pressure switch is open.
TP3
This test point enables the user to check if the water
pressure switch (WP) contact is open or closed.
TP 4
This test point enables the user to check if the internal
protector for the condenser fan motor(IP-CM) is open or
closed.
TP 5
This test point enables the user to check if the internal
protectors for the evaporator fan motors (IP-EM1 or
IP-EM2) are open or closed.
TP 6
This test point enables the user to check if the controller
water tank heater relay (TQ) is open or closed
TP 7
This test point is not used in this application.
TP 8
This test point is not applicable to the units covered
herein.
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