Installing The New Pecm - Siemens Maxum II Reference Manual

2.2.4.3

Installing The New PECM

Procedure
1. On the replacement PECM3 assembly do the following:
– Set the Purge Disable jumper JP2 to the same setting as the PECM being replaced.
– Install the appropriate fuses for either 115VAC or 230VAC in Fuses F1 and F2 and install
– Move jumper cables or termination plugs to the replacement PECM.
– Move the TL/OT modules from the old PECM to the replacement PECM, in the mounting
– If Heater Termination Plugs are installed in the old PECM instead of cables at the
2. Ensure that there are no wires behind the mounting position of the PECM.
3. Because the atmospheric Purge switch SW1 is near the back wall after the PECM is
installed, if desired, the Purge tube may be installed on SW1 before mounting the PECM
in the next step.
4. Install the replacement PECM on the two mounting bolts.
5. Tighten the two 5mm hex nuts.
6. Start at the back of new controller and plug in the following cables (see the connector
identification illustrations)
– If not already connected in step 12, connect the Purge switch SW1 (tubing connection)
– Relay power plug TB9 and Heater Relay Control cable
– Fan power cable plug J18, and 24VDC power cables to the orange TB1 and TB2 on top
– I
– Low wattage heater connections (TB8, TB3 to TB5, and LWH1 to LWH6)
– AC inputs (TB1, TB2, & TB10.)
– Heater pressure switch (J10) (If no cable, then a jumper is needed.)
7. When replacing in a unit that has a MMI-1, then connect the MMI LED cable to J17.
8. Connect the Purge Signal cable to J1302.
9. Move 24V cable (from power supply) from WDB J1 to PECM3 TB1.
10.Add 24V power cable, 2021837-001 from PECM3 TB2 to WDB J1.
Maxum II Reference Manual
Manual, 7/2017, 2000596-001
Electronic Compartment Component Descriptions and Maintenance Procedures
fuse covers.
locations marked "TEMP CONTROL 1" and TEMP CONTROL 2". These are required
to avoid false alarm codes.
positions marked "TEMP RTD 1" and "TEMP RTD 2", move these to identical locations
on the replacement PECM. The plugs disable the PECM temperature circuits, including
the LEDs.
board (there are TB1 and TB2 AC connectors on the bottom board as well - see
illustration at right.)
C connections (J24 - J26, J30 - J33)
2
2.2 Power Entry and Control Module
31