Valves; Solenoid Valves; Solenoid Valve Control Module (Svcm); Figure 4-1 Solenoid Valve Control Module (Svcm) - Siemens Maxum II PD PA AP Service Manual

Valves

4.1

Solenoid Valves

4.1.1

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 PECM module (PECM-DC in the Modular Oven
model). The newer version 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
controlled from the SVCM electronics.
Legacy SVCM
Figure 4-1 Solenoid Valve Control Module (SVCM)
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001
Plastic Tubing Connectors
Solenoids
Test Buttons
(bottoms of solenoids)
Present SVCM
C bus. Pulse timing is
2
Solenoid Control Connectors
(cable assembly to PECM)
Solenoid Valve Tubing Manifold
4
27