Manual Shut-Down; Shut-Down Modes; Microtim Operation; Pdt Operation - Edwards iXH100 Instruction Manual

4.3

Manual shut-down

If you shut the system down and don't isolate it from the electrical supply, do not disconnect the
Pump Display Terminal or release control from the Pump Display Terminal or front panel. If you do
the system could be started by another Module.
Do not remove the inlet connections until the pump has been allowed to stop rotating and the
power has been isolated. The pump can take up to three minutes to completely stop.
If you stop the pump without the nitrogen purge cycle, for example by using the EMS button, on processes that
have condensable or solid by-products then the pump may not restart.
The pump can be shut down using either the MicroTIM, the PDT or the front panel controls. Note that only the item
in control can stop the pump (refer to
Note: The EMS button will always stop the pump. It does not matter which item has control. Refer to
If the pump is not going to be required for some time, switch off the electrical supply and the cooling-water supply.
4.3.1

Shut-down modes

Auto shut-down introduces a nitrogen purge cycle which lasts for 15 minutes before the pump is shut down. This is
the recommended shut-down mode.
Fast shut-down immediately stops the pump without gas purge.
Ramped shut-down is an optional mode for iXH. In some harsh applications, process residues can accumulate in the
pump mechanism during shut-down, making it difficult to restart the pump next time. To prevent this problem a
special ramped shut-down can be performed. Contact Edwards for more information.
4.3.2

MicroTIM operation

Use your control equipment to reset the pump start/stop signal to the interface connector. The Running LEDs will
then go off, and the pump running status output signal will open.
4.3.3

PDT operation

Press the stop button on the PDT (refer to Appendix A1 for more information). You can choose whether to select
Auto or Fast shut-down mode.
4.3.4

Front panel control operation

Press and hold the stop button
(recommended, refer to Section 4.3.1
The running LED (Figure 2, item 2) flashes whilst the pump is slowing down and will then turn off when the pump has
shut down.
© Edwards Limited 2012. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
WARNING
WARNING
CAUTION
Section 1.4).
(Figure 2, item 4) for 5 seconds to stop the pump in Auto shut-down mode
above). Repeat within 10 seconds to stop the pump in Fast shut down-mode.
M561-00-880 Issue C
Section 4.6.
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