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Introduction
M588-00-880 Issue E
1.4 Priority of control
The dry pumping system can be controlled by a number of modules: the front control panel (refer to Figure 1), a
Pump Display Terminal (PDT) or by the customer’s system through the MCM MicroTIM or one of the serial interfaces.
Only one of these can have control of the dry pumping system at any one time. That is, once one of these has control
of the dry pumping system, control requests from the others are denied. Control must be released by one module
before control can be taken by a different module.
There are LEDs to indicate control:
The LED on the front control panel illuminates when control is taken by the front panel, refer to Figure 1,
item 6.
The LED on the rear of the pump illuminates when control is taken by the MicroTIM, refer to Figure 3, item 9.
The local control LED on the PDT illuminates when control is taken by that particular PDT, refer to
Appendix A2.
The PDT display also indicates which system is in control.
1.5 Active utility control / standby
The Active Utility Control (Green Mode) function may reduce speed, power and purge gas consumption of the dry
pumping system while on standby. The dry pumping system can be put into Green Mode / standby mode using the
front control panel, the PDT or through the MCM MicroTIM. Refer to Section 4.3 for more information.
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