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6 − 15 T-364
6.21 CONTROLLER
6.21.1 Handling Modules
CAUTION
Do not remove wire harnesses from module
unless you are grounded to the unit frame
with a static safe wrist strap.
CAUTION
Unplug all module connectors before
performing arc welding on any part of the
container.
The guidelines and cautions provided herein should be
followed when handling the modules. These precau-
tions and procedures should be implemented when
replacing a module, when doing any arc welding on the
unit, or when service to the refrigeration unit requires
handling and removal of a module.
a. Obtain a grounding wrist strap (Carrier Transicold
P/N 07-00304-00) and a static dissipation mat (Carri-
er Transicold P/N 07-00277-00). The wrist strap,
when properly grounded, will dissipate any potential
static buildup on the body. The dissipation mat will
provide a static-free work surface on which to place
and/or service the modules.
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 module. Do not touch any of the
electrical connections if possible. Place the module
on the static mat.
e. The strap should be worn during any service work on
a module, even when it is placed on the mat.
6.21.2 Controller Troubleshooting
A group of test points (TP, see Figure 6 − 13) are
provided on the controller for troubleshooting electrical
circuits (see schematic diagram, section 7). 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.
TP 1 − Not used in this application.
TP 2 − Enables the user to check if the high pressure
switch (HPS) is open or closed.
TP 3 − Enables the user to check if the water pressure
switch (WP) contact is open or closed.
TP 4 − Enables the user to check if the internal protector
for the condenser fan motor (IP-CM) is open or closed.
TP 5 − Enables the user to check if the internal protec-
tors for the evaporator fan motors (IP-EM1 or IP-EM2)
are open or closed.
TP 6 (IF EQUIPPED) − Enables the user to check if the
controller liquid injection valve relay (TQ) is open or
closed.
TP 7 − Enables the user to check if the controller econo-
mizer solenoid valve relay (TS) is open or closed.
TP 8 − Not used in this application.
TP 9 − The chassis (unit frame) ground connection.
TP 10 − Enables the user to check if the heat termination
thermostat (HTT) contact is open or closed.
1
2
3
4
1. Controller Software Programming Port
2. Mounting Screw
3. Controller
4. Test Points
Figure 6 − 13 Controller Section of the Control Box