© Edwards Limited 2013. All rights reserved. Page 47
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Operation
B722-40-880 Issue F
4.4.4 Parallel monitoring
It is possible to monitor the following parameters:
Analogue output
Normal signal
Fail signal
Refer to Section 3.6 for instructions on how to monitor these signals.
4.5 Operation with serial control and monitoring
4.5.1 Delayed start
If using a TAV solenoid valve controlled by the Podule, it may be desirable to close it before starting the DX pump.
This will allow the backing pump to reduce the pressure in the vacuum system.
To close the vent valve, send the following command:
The reply will be in the following format:
Note: This command overrides the current vent option and closes the vent valve. There is no open vent valve
command but, when a stop command is sent to the pump, the override is cleared.
4.5.2 Start the pump
To start the pump, send the following command over the serial communications link:
The reply will be in the following format:
The pump will then accelerate to full operating speed. The green indicator LED will illuminate when the pump
reaches Normal speed. This is 80% of full rotational speed by default but a different value may have been selected
to suit the application.
4.5.3 Standby speed
To run the DX pump at Standby Speed, send the following command over the serial communications link:
The reply will be as follows:
If the pump is currently below Standby Speed, it will accelerate until it reaches Standby Speed. If it is running faster
than Standby Speed, it will decelerate until Standby Speed is reached.
Command !
c 8 7 5sp1cr
Reply * c 8 7 5sp rcr
Command !
c 8 5 2sp1cr
Reply *
c 8 5 2sp1cr
Command !
c 8 6 9sp1cr
Reply *
c 8 6 9sp rcr
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