© Edwards Limited 2007. All rights reserved. Page 53
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Operation
A419-00-880 Issue F
5.4 Manual shut-down
The pump can take up to three minutes to completely stop.
EPX N pumps must be purged for 30 minutes with nitrogen before the run signal is removed.
Use the following procedure to shut down the pump.
Use your control equipment to remove the run signal to the pump (refer to Section 3.11). The Run LED (Figure 4,
item 3) will then go off, and the pump running status output signal will open.
Note: After removing the run signal, the pump should be allowed to come to a stop before the run signal is
re-applied. If the run signal is removed for more than 1 second and then re-applied before the pump has
stopped, the pump will run down to a stop before restarting automatically. This is a function of the control
architecture of the pump.
If you are removing the pump, follow the instructions given in Section 7.
5.5 Status and fault indications
During normal operation, only the Power and Run LEDs (Figure 4, items 2 and 3) should be on, and the pump running,
pump warning and pump alarm status outputs should be closed. If either or both of the other LEDs (Figure 4,
items 4 and 5) go on, or if either or both of the pump warning and pump alarm status output signals are open, refer
to Section 6.6.
5.6 Unplanned shutdown and alarms
The EPX will automatically shutdown when a pump protection sensor operates (refer to Section 1.3), or should the
inverter drive fail. When the EPX automatically shuts down, the Alarm LED (Figure 4, item 5) is illuminated, and the
pump alarm status output signal opens.
If the EPX pump goes into an Alarm state, power to the pump must be completely switched off and then re-applied
in order for the alarm to clear. The pump fault must be identified and rectified before power is re-applied.
If there is an unplanned shutdown, ensure that the cause of the shutdown is identified and rectified before the pump
is restarted. If you are in doubt, please call a Edwards representative.
Do not remove the inlet connection until the pump has been allowed to stop rotating and the
power has been isolated.
In the event of an unplanned shutdown the pump should not be restarted unless the cause is
identified and rectified. If this is not the case, seal the inlet and exhaust of the pump and call a
Edwards representative.
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