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SECTION 4
Engine and Temperature Control
NOTES
1. If the unit is in an alarm condition, the control system alarm response may override the operation described
herein. If an alarm is displayed in the MessageCenter, refer to the specific alarm description in Section 7 for
“Unit Control” descriptions.
2. With the complex control interactions in use with the APX Control System there are many user selected and
preprogrammed software overrides which may change the operation of the unit. Refer to Section 4.9 and
Section 4.10 for complete descriptions of these features.
4.1 Introduction
This section describes operation of the unit when power is supplied from an external source - Electric Operation
and when power is supplied by the internal generator - Engine Operation. The section also describes two addi-
tional sub-categories of operation; Start-Stop Operation and Continuous Operation.
for a description and flow diagram of the refrigerant system component interaction while in cooling, refer to Section
2.13. for a description of the system component interaction in heating or defrost, refer to Section 2.14.
4.2 Sequence Of Operation - Electrical
With the battery connected (see schematic diagram Section 10.2), power is available from the battery to the F1
fuse and the starter solenoid. The F1 fuse supplies power to:
• F3 fuse, which supplies power through the battery guard to PM-18 to 1RP-BG-B
• F4 fuse, which supplies power to PM-15 to SP24, SP24 connects to ENCU-22 and 1RPC-B and ES-F
• F5 fuse, which supplies power to PM-13 to SP22
• F6 fuse, which supplies power to PM-1 to 1MSM-1 through the MSM and comes out of 1MSM-7 to SP21,
from SP21 to DM-10 and HVB2-G to HVB3-5 to CCB-4
• F7 fuse, which supplies power to PM-3 and PM-14 to SP20. SP20 connects to optional FHR-C
• The PM-ALT+ to the battery charger positive output
• The common terminal of the K1 PER relay contacts
• The EPH output, when required conditions are met.
Once the module logic circuit is established (F6), the modules begin to communicate over the controlled area net-
work (CAN).
• The CAN 1H connectivity is established from the power module to the main control board in the MSM (PM-
23 to 1MSM-12), from the main control board to the stepper board (1MSM-2 to 2MSM-29). The circuit con-
tinues from the stepper to splice point 2 (2MSM-27 to SP02), from splice point 2 to the engine control unit
(SP02 to ENCU23) and the ES connector (SP02 to ES-D), passes through the ES connector to the contac-
tor control board (ES-H to HVB1-A to HVB3-1 to CCB-5). If the unit is equipped with an EES, the CAN 1H
will flow through the EES module.
• The CAN 2H connectivity is established from the main control board to the display module (1MSM-4 to DM-
2). The CAN 2H will also be used if a remote panel is connected.
• The CAN 1L connectivity is established from the power module to the main control board in the MSM (PM-
12 to 1MSM-3), from the main control board to the stepper board (1MSM-6 to 2MSM-30). The circuit contin-
ues from the stepper to splice point 3 (2MSM-28 to SP03), from splice point 3 to the engine control unit
(SP03 to ENCU-24) and the ES connector (SP03 to ES-C) passes through the ES connector to contactor
control board (ES-G to HVB1-B to HVB3-2 to CCB-17). If the unit is equipped with an EES, the CAN 1L will
flow through the RRS module.
• The CAN 2L connectivity is established from the main control board to the display module (1MSM-8 to DM-
6). The CAN L2 will also be used if a remote panel is connected.
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