M588-00-880 Issue E
Page 152 © Edwards Limited 2015. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Appendix A3
Example:
PDT shows the following:
0108 0200
This translates to:
alarm 1 in bit 2 – PWM_TRIP
alarm 8 in bit 4 – OVERT
warning 2 in bit 6 - HIGHTM.
This means the motor overheated and switched the output off.
A3.5 Other problems
A3.5.1 Pump controller communications
The pump controller contains two processors that perform different functions. Under normal operation the two
processors communicate with each other internally whilst they perform their functions.
Under fault conditions it is possible that the two processors stop communicating with each other. In this
circumstance:
The pump may continue to run normally, with gas valves and gate valves kept in the same state
Depending which device is ‘in control’ of the system, control might be released (for example PDT).
The front panel controls can be used to ‘take control’ and stop the pump but this will only be a simple stop,
it will not be possible to use any of the shut down sequences such as Smart Stop.
If the front panel controls or EMS button are used to stop the pump, the warning LEDs on the pump will flash
and the alarm LED will illuminate. The inlet isolation valve will shut.
Stop requests from all devices apart from the front panel controls will be ignored.
Any requests to start the pump will be rejected.
For systems fitted with the MCM MicroTIM:
If the pump is stopped when communication is lost then ‘alarm present’ is set on the alarm line.
If the pump is running when communication is lost then the outputs to the MicroTIM are unaffected.
To Previous Page
Loading...
