WARNING:
After power to the pump has been switched off, either through emergency or as a
requirement, the rotor will continue to spin at very high speeds. The rotor possesses
considerable mechanical energy until it slows down/stops.
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
With parallel control the pump rotor will decelerate to rest when stopped.
Stop the nEXT pump by disconnecting 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 72 for instructions on how
to monitor these signals.
7.4 Operation 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 starting 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:
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.
CAUTION:
Do not remove the controller from the pump until the pump is completely at rest.
The exposed electrical pins may pose a potential hazard. The user could also be
exposed to a back e.m.f. from the pump and potentially damage the controller.
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