Microtim Operation; Pdt Operation - Edwards GXS Series Instruction Manual

In Fast shut down mode, no gas purges are introduced and the pump stops quickly. This
method of shut down is not recommended.
In Auto shut down mode, a purge gas cycle is introduced and the pump shuts down
gradually over a time period. This is the recommended shut down mode and is the
default mode on the dry pumping system.
Smart Stop is an additional sequence that allows the user to define the time period for
the gradual shut down and to configure a setpoint temperature. If Smart Stop is
enabled, the pump will perform a Smart Stop when the user selects Auto shut down.
Refer to
Table 22 Stop sequences
Sequence
Stop with inlet purge
Smart stop
The pump can be shut down using either the MCM MicroTIM, the PDT or the front panel
controls. Note that only the item in control can stop the pump. Refer to
control on page 11.
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. Seal the pump inlet and exhaust to prevent any moisture
in the atmosphere from corroding the pumping mechanism.

4.5.1 MicroTIM operation

Use the 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. An Auto shut down cycle is always performed when the pump is stopped
using the MCM MicroTIM.

4.5.2 PDT operation

Press the stop button on the PDT (refer to
information). Choose whether to select Auto or Fast shut down mode.
M58800880_H - Operation
Table: Stop sequences
Description
Inlet purge gas valve is opened (medium‑duty pumps only).
Inlet isolation valve is closed (if fitted).
Pump runs for 15 minutes before stopping.
All gas purge valves are closed before the pump stops.
Inlet purge gas valve opened (medium‑duty pumps only).
Inlet isolation valve is closed (if fitted).
Pump speed is ramped down over configurable shut down
time.
All purge gas valves are closed before pump stops.
Pump stops after the configurable shut down time or after a
configurable time period after the pump temperature is below
a configurable setpoint.
Emergency stop on page 62.
for the stop sequences.
Pump display terminal
Page 60
Priority of
on page 120 for more