© Edwards Limited 2012. All rights reserved. Page 43
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Operation
M561-00-880 Issue C
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 Table 20.
Refer to Section 4.4 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 you are in any doubt, contact Edwards.
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 20 - Pump protection sensors
Sensor Warning condition triggered Alarm condition triggered
Exhaust pressure transducer
- for iXH excluding systems containing the 450H
dry pump
0.35 barg (5 psig) 0.55 barg (8 psig)
- for all systems containing iXH450H dry pump 0.2 barg (3.2 psig) 0.35 barg (5 psig)
- for all iXL 500 systems 0.3 barg (4.4 psig) 0.4 barg (5.8 psig)
DP TEMP
- iXH systems containing 100 and 200 dry pumps:
Standard 130 °C 140 °C
T variants 160 °C 170 °C
- iXH systems containing 200H dry pump:
Standard and T variants 160 °C 170 °C
- iXH3030:
Standard 160 °C 170 °C
T variant 170 °C 180 °C
- iXH systems containing 450H and 500H dry
pumps:
Standard and T variants 175 °C 185 °C
- iXL250Q 150 °C 165°C
- all iXL500 systems 139 °C 144 °C
- all iXL750 systems 180°C 190°C
DP TEMP 2
- iXH3030T 140 °C 150°C
- iXH4550HT 145 °C 155 °C
- iXH6050HT 145 °C 155 °C
DP Endcover
- iXH3030T 100°C 110°C
MB Stator
- iXH610 only 60 °C 70 °C
- all other iXH and iXL variants 120 °C 130 °C
MB endcover, T variants only 100 °C 110 °C
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