Power Entry And Control Module; Pecm Overview - Siemens Maxum II Reference Manual

Electronic Compartment Component Descriptions and Maintenance Procedures

2.2 Power Entry and Control Module

2.2 Power Entry and Control Module
2.2.1

PECM Overview

Overview
The PECM3-CTL board mounts on the PECM-SSR board. This assembly provides a variety
of power and control functions. The connections are shown below.
Optional
UPS input
for 24vdc
supply
PECM-SSR Board Board
Filtered
AC out
to 24v
supply
Figure 2-4 PECM3 I/O Connections
The PECM3 assembly part number is 2021828-002. An upgrade kit, part number 2022019-001
is available to replace earlier units.
18
AC in
LWH1 - LWH5
PECM3-CTRL Board
MWH out
out
I
L1 MMI
LED out
HWH SSR
power out
Purge Air
Switch
Fan
power
Purge disable jumper
Purge signal out
2
C bus
(Ribbon-cable
connector to
PECM-SSR)
Maxum II Reference Manual
Manual, 7/2017, 2000596-001
24v in
HWH SSR
control out
Temp RTD in
I 2 C bus
Air bath heater
monitor in
Solenoid
control out
Atmospheric
pressure sensor