Memmert PM 200/400/500 Pump Module (Generation 2003) - Manual (Page 13)

VO
Muster
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3
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page 13
7 Switching output for external vacuum pump purge valve and pump control (option)
The 3-way switched output serves to control the vacuum
pump of the optional pump module (PM) of the vacuum oven
(VO).
7.1 Vacuum pump purge valve
When loads with a high moisture content are being dried
there is a possibility during prolonged operation that the
pump output decreases through condensate forming in the
pump heads. The diaphragms can be blown free by briefly
purging the pump heads with fresh air. This improves the
effectiveness of the drying process.
Note:
In conjunction with the optionally available pump modules
PM 200, PM 400 and PM 500 this cyclic purge takes place
automatically as the pump performance deteriorates.
Decisive advantage:
The drying process takes place more rapidly and with reduced
energy consumption, the wear on the pump is reduced.
This function can be de-activated by removing the pump
purge connecting cable at the back of the unit.
7.2 Demand-controlled vacuum pump shut-down (option)
After the end of a drying programme, or after prolonged operation with any vacuum demanded by the
controller, the vacuum pump incorporated in the pump module (PM) is switched off via the control line.
Note:
A control signal switches off the vacuum pump incorporated in the optional pump module (PM). The
signal lamp in the main switch of the pump module remains alight even when the vacuum pump has been
switched off via the control line.
Decisive advantage:
The demand-controlled shut down of the vacuum pump reduces energy consumption and increases the
life of the vacuum pump by reducing the wear on the pump diaphragms.
This function can be de-activated by removing the pump purge connecting cable at the back of the unit.
The vacuum pump is then running continuously.
Pin connections of the socket
on the back of the unit:
1 output purge valve
GND (switched)
2 24V DC
3 pump switch-off
GND (switched)