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Run the pump at standby speed with parallel control

If the pump is running below or above standby speed it will accelerate or decelerate unl

standby speed is reached.

1. To run the nEXT85 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.

Stop the pump with parallel monitoring

WARNING:

Aer power to the pump has been switched o, either through emergency or as a

requirement, the rotor will connue to spin at very high speeds. The rotor possesses

considerable mechanical energy unl it slows down/stops.

WARNING:

Do not remove the controller from the pump unl the pump is completely at rest. The

exposed electrical pins may pose a potenal hazard. The user could also be exposed to a

back e.m.f. from the pump and potenally damage the controller.

With parallel control the pump rotor will decelerate to rest when stopped.

Stop the nEXT85 pump by disconnecng the start/stop control input from the 0 V control

reference on the logic interface connector.

Parallel monitoring

Analogue output, normal signal and fail signal parameters can be monitored.

Refer to Connect the parallel control and monitoring on page 27 for

instrucons on how to

monitor these signals.

Operaon with serial control and monitoring

Delayed start with serial control

When using a TAV solenoid valve controlled by the motor controller, it can be closed before

starng the nEXT85 pump. This allows the backing pump to reduce the pressure in the vacuum

system.

1. To close the vent valve, send the following command:

Command ! C

8 7 5

2. The reply will be in the following format:

Reply * C

8 7 5

Note:

This command overrides the current vent opon 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.

B8G0-00-880A - Operaon of the nEXT85

Page 49

Edwards nEXT85 User Manual

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