Removing The Pecm - Siemens Maxum II Reference Manual

Electronic Compartment Component Descriptions and Maintenance Procedures
2.2 Power Entry and Control Module
2.2.4.2

Removing The PECM

Precautions
Before starting this procedure, follow the steps in the
Voltage dangerous to life exists. Failure to follow proper safety procedures may result in
severe injury or death.
Before beginning to remove or install the PECM assembly, the power must be externally
removed from the GC. AC power comes directly into this board for regulation and distribution
in the electronics enclosure, so power must be removed and secured/tagged to prevent
inadvertent application while this procedure is being performed.
High-voltage circuitry. Failure to follow proper procedures may result in equipment damage,
personal injury or death.
The cable harness connectors and the chassis plugs associated with the Heater circuits are
marked with orange identifier tags. Before reconnecting any connector or plug to a Heater
circuit, ensure that the orange identifier tag on the connector or plug reads identical to the
orange identifier tag on its mating connector.
Observe proper fuse values to prevent equipment damage or personal injury.
The PECM1 is used in applications with both 115VAC and 230VAC power. Before installing
a replacement assembly, ensure that the correct fuses for the particular application are
installed in the replacement PECM3.
Procedure
1. Open electronics door. If the latch is locked, use 4mm (5/32'") Allen wrench to unlock.
2. Label all cable connections before disconnecting if they are not already labeled. Be sure
to read the Warning below concerning those tagged with orange labels.
3. Unplug cables from all PECM connectors.
4. Unplug the atmospheric reference tube from the purge switch. (labelled "Purge SW", tubing
connection next to the back wall of the EC, on the PECM1.
5. Use a 5mm nut driver to loosen two hex nuts at the top of each side of base plate of the
PECM.
6. Slide the PECM up and then lift the PECM off of the mounting bolts.
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WARNING
WARNING
CAUTION
General Analyzer Shutdown Procedure .
Maxum II Reference Manual
Manual, 7/2017, 2000596-001