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Sequence
Warm-up
On-process
6.1.2 Dry pump speed control
The dry pump is designed to run directly at maximum speed (110 Hz, inverter frequency
220 Hz) when powered on. For speed control purpose, adjust `q1-04' parameter of the
inverter by keypad or MODBUS communication. The allowable setting range of
parameter `q1-04' is 27 to 100, which is corresponding with 30 Hz to 110 Hz (inverter
frequency 220 Hz) of dry pump running speed respectively.
Note:
Setting 'q1-04' higher than 100 is not allowed.
6.2 Manual shut down
WARNING:
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.
WARNING:
If you switch off water‐cooling by closing both cooling‐water inlet and outlet, the
temperature may rise and result in unacceptable high water pressure and the water
circuit may leak.
CAUTION:
If the pump is stopped without the gas purge cycle on processes that have
condensable or solid by‑products then the pump may not restart.
CAUTION:
For applications pumping liquids or condensible gases: If the pump is switched off
straight after the process then the liquids may remain trapped in the pump. These
liquids can corrode the pump mechanism while the dry pumping system is switched
off for extended periods and may prevent the pump from starting again. For these
applications, we recommend to operate the EXS pump for at least 40 minutes with all
purge on. Once the pump has stopped, seal the inlet and exhaust to prevent
migration of liquid/condensates back into the pump mechanism.
A41870880_A
A41870880_A - Operation
Description
Pump runs at 110 Hz (inverter frequency 220 Hz) until it reaches the working
temperature and then goes on‑process. Meanwhile, an warm up finished
warning is generated.
Inlet isolation valve opened (if fitted).
The pump goes straight to full speed.
The pump will not go on-process if there are active warnings.
Gas ballast is opened (if needed).
Page 51
07/2021 - ©Edwards Limited
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