Siemens Maxum II - Power Entry and Control Module; PECM Overview

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.
AC in
Optional
UPS input
for 24vdc
supply
LWH1 - LWH5
out
MWH out
Purge Air
Switch
24v in
Fan
power
HWH SSR
control out
I
2
C bus
I
2
C bus
Solenoid
control out
Atmospheric
pressure sensor
Air bath heater
monitor in
(Ribbon-cable
connector to
PECM-SSR)
Purge signal out
LWH/MWH control in
HWH control out
HWH control in
HW
ou
H
co
nt
cont
r
ol
HW
HW
HW
H
H
H
co
co
co
nt
nt
nt
nt
nt
ro
ro
ro
ro
l
contr
o
TL/OT modules
Temp RTD in
Filtered
AC out
to 24v
supply
L1 MMI
LED out
MWH
HWH SSR
power out
PECM-SSR Board
PECM3-CTRL Board
F1
F1
F5
F2
F5
F5
F2
F2
F2
F2
F2
F2
F2
F2
F2
F2
F2
F2
F2
F4 (without cover)
B
oa
rd
cov
er)
(without cov
F4 (witho
F4 (without
F3 (without cover)
Purge disable jumper
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.
Electronic Compartment Component Descriptions and Maintenance Procedures
2.2 Power Entry and Control Module
Maxum II Reference Manual
18 Manual, 7/2017, 2000596-001