Power Cable
from PECM
Control Cable from
PECM or DPM
Status LEDs
Status LEDs
Figure 2-39 Medium Wattage SSR Module
2.8
Solenoid Valves
2.8.1
Solenoid Valve Control Module (SVCM)
The Solenoid Valve Control Module (SVCM) provides pneumatic interface to control flow to
the oven sampling and column valves. Solenoid valves are suitable for air, nitrogen and helium
on the pressure side and vacuum on the vent side. The electronic enclosure has space for up
to three modules.
SVCM Versions
There are two configurations of SVCM. The old version, which is still supported as a spare
part, is equipped with a valve driver circuit board. For the newer version of the SVCM, this
valve drive circuitry has been moved to the PECM2 module. The newer version has a lower
cost and is more reliable and robust.
The SVCM electronics, whether onboard for the old version or on the PECM for the new
version, receives commands from the SYSCON module (via the I
2
C bus). Pulse timing is
controlled from the SVCM electronics.
Electronic Compartment Component Descriptions and Maintenance Procedures
2.8 Solenoid Valves
Maxum II Reference Manual
76
Manual, 7/2017, 2000596-001
