A540-55-880 Issue D
Page 34
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Operation
4.4
Automatic shut-down
CAUTION
If ‘Run 'til crash’ is selected, the pump(s) can be damaged and warranties may be invalidated.
Normally, if an alarm condition exists, the control system will shut down the system.
Notes:
1. If required, ‘Run 'til crash’ operation can be selected. In this mode of operation, most alarm conditions
will be ignored and the pump(s) will continue to operate. For safety reasons, some alarms cannot be
overridden and the system will automatically shut down even if ‘Run 'til crash’ has been selected.
Refer to
.
2. ‘Run 'til crash’ is automatically reset to ‘off’ when the electrical supply is removed.
3. The Tool Interface overrides the ‘Run 'til crash’ state selected provided it has control of the pump.
4.5
Unplanned shut down and alarms
The system is fitted with a number of pump protection sensors that will give warnings and alarms, refer to
Once an alarm is triggered, the power to the motors is shut off. This will only occur in extreme fault conditions.
for information about alarms and automatic shut-down conditions.
If the system has an unplanned shut-down, ensure that the cause of the shut-down is identified and rectified before
restarting. If a PDT is connected to the pump, note and record any warning or alarm codes that are displayed (see
) to assist with identifying the root cause of the shut-down or alarm. If in any doubt, contact an Edwards
Service Engineer.
Note:
The high temperature alarms on Edwards vacuum pumping systems are system protection trips and should
be considered as an abnormal running condition. If a system has tripped due to any high temperature alarm
the system should be investigated and the reason for the alarm established. Once the fault has been
remedied the system should be left for a minimum of 30 minutes before attempting to restart.
Table 13 - Alarm actions
Alarm Description
Alarm stops dry
pump
Alarm stops booster
pump
Alarm overrides
‘Run ‘til crash’
EMS or System Configuration (set-up) fault
Yes
Yes
Yes
Booster Stator or End Cover Temperature
No
Yes
No
Dry Pump Stator or End Cover Temperature
Yes
Yes
No
Booster status
No
Yes
Yes
Dry Pump status
Yes
Yes
Yes
Table 14 - Pump protection sensors
Sensor
Warning condition triggered
Alarm condition triggered
Dry pump body temperature
104 °C
112 °C
Booster pump body temperature
120 °C
130 °C
Booster pump end cover
temperature
100 °C
110 °C
