TMS Removal and Replacement Procedure
STEP 1: Shutdown
Power down the AES Cabinet system.
Engage E-Stop and confirm 0 Vdc on HV terminals.
Disconnect power to the auxiliary 240 Vac input to the cabinet.
Remove all Manual Service Disconnects from the battery modules (MSD).
Tag the system as “De-energized – Maintenance in Progress.”
STEP 2: Disconnect Electrical and Communication Lines
Label and disconnect:
AC main power (L-N-PE)
CAN communication line
Disconnect the TMS grounding from the cabinet chassis.
Confirm all connectors are clean and protected with caps or covers.
STEP 3: Remove the TMS Unit
Unscrew the M6 mounting bolts that secure the chiller’s brackets.
Remove the water chiller from the rear of the cabinet bottom.
Avoid strain on any coolant lines or harnessing.
Place the unit on a pallet for return/rebuild.
STEP 4: Install Replacement TMS Unit
Slide new chiller into place from the rear of the cabinet.
Align mounting holes and fasten brackets using M6 flange bolts.
Torque: 9 to 11 N·m (6.6 to 8.1 ft-lb)
Connect water inlet and outlet hoses.
Confirm directionality of piping (inlet/outlet must not be reversed).
Reconnect:
Ground
AC power
Pump power
CAN
STEP 5: Power-up and Functional Verification
Inspect all fittings and lines for leaks.
Wipe down any spilled fluid.
Reapply auxiliary power and restore MSDs.
Power on the inverter and AES Cabinet.
Verify:
TMS startup (coolant pump, fan, compressor or heater – based on temperature)
No fault codes or alarms
Coolant temperatures stabilize at setpoints (Cooling: 20°C / 68°F, Heating: 30°C / 86°F)
Run TMS auto-test or force cooling/heating modes for final validation.
Documentation and Handoff
Record:
TMS serial number (replaced unit)
Coolant batch/lot number
Operating pressures at commissioning
Time/date of service and technician signature