Figure 7.24 Controller Section Of The Control Box - Carrier 69NT40-541-001 Operation And Service

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 protector 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.
7.20 CONTROLLER
7.20.1 Handling Controller
Do not remove wire harnesses from controller unless you are grounded to the unit frame with a
static safe wrist strap.
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 mod-
ule. 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.
1
1. Controller Software Programming Port
2. Mounting Screw
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 dissipate any
potential buildup on the body. The dissipation mat will provide a static-free work surface on which to place
and/or service the controller.
WARNING
!
WARNING
!

Figure 7.24 Controller Section of the Control Box

2
- - - - -
7–29
3
3. Controller
4. Test Points
4
T-316