Siemens Maxum II Reference Manual

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

Siemens Maxum II Specifications

General

Category	Gas Chromatograph
Measurement Principle	Gas Chromatography
Communication Protocols	Modbus, Ethernet, Profibus
Operating Temperature	-20°C to 55°C
Power Supply	24 VDC or 100-240 VAC
Mounting	rack mount
Applications	Refinery, chemical, petrochemical, natural gas
Detectors	Thermal Conductivity Detector (TCD), Flame Ionization Detector (FID)
Sample Inlets	Multiple
Dimensions	Varies by configuration (e.g., 19" rack mount)