7.3.2 Run the pump at standby speed with parallel control
If the pump is running below or abo
ve standby speed it will accelerate or decelerate
unl standby speed is reached.
1. To run the nEXT pump at standby speed, link the standby control input to the 0 V
control reference on the logic interface connector.
2. To return the pump to full speed, disconnect the standby control input from the 0
V control reference on the logic interface connector.
7.3.3 Stop the pump with parallel monitoring
WARNING:
Aer pow
er to the pump has been switched o, either through emergency or as a
requirement, the rotor will connue to spin at very high speeds. The rotor possesses
considerable mechanical energy unl it slows down/stops.
CAUTION:
Do not remove the controller from the pump unl the pump is completely at rest.
The exposed electrical pins may pose a potenal hazard. The user could also be
exposed to a back e.m.f. from the pump and potenally damage the controller.
With parallel control the pump rotor will decelerate to rest when stopped.
Stop the nEXT pump by disconnecng the start/stop control input from the 0 V control
reference on the logic interface connector.
7.3.4 Parallel monitoring
Analogue output, normal signal and fail signal parameters can be monitored.
Refer to Connect the parallel control and monitoring on page 58 for instrucons on how
to monitor these signals.
7.4 Operaon with serial control and monitoring
7.4.1 Delayed start with serial control
When using a TAV solenoid valve controlled by the motor controller, it can be closed
before starng the nEXT pump. This allows the backing pump to reduce the pressure in
the vacuum system.
To close the vent valve, send the following command:
Command
! c 8 7 5 sp 1 cr
The reply will be in the following format:
Reply
* c 8 7 5 sp r cr
08/2021 - ©Edwards Limited
Page 80B8J200880_D
300812671_002_C3
B8J200880_D - Operaon
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