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Appendix A2
M561-00-880 Issue C
A2.4 Other problems
A2.4.1 Pump controller communications
The pump controller contains two processors that perform separate functions. Under normal operation the two
processors communicate with each other internally but under fault conditions it is possible that the two processors
will stop communicating. The behaviour of the system will depend on its mode of operation prior to the
communication failure. There may be no change in operation initially.
To minimise impact on process, the system will continue to run normally if it was already running when the
communication failure occurred. The gas valves and Gate valves remain in the state that they were in prior to the
communication failure and outputs to the MicroTIM are unaffected. It is important to note, however, that control
might be released from the device that was ‘in control’ (for example PDT) and that stop requests will be ignored
from all devices apart from the front panel controls.
To stop a system that has suffered a communication failure either use the EMS or use the front panel controls to ‘take
control’ of the system and then stop it. In this situation, the warning LEDs on the pump will flash, the alarm LED will
illuminate and the inlet Gate valve will close. It is not possible to use the Auto or Ramped shut-down modes, the
pump will stop immediately without any gas purges. Any requests to start the pump will be rejected until the fault
has been rectified. Once the pump has stopped, cycle the power to the pump and attempt to re-start it. Refer to
Tables A15 and A16 for actions if any warnings or alarms are generated.
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