B800-00-880 Issue A
Page 52
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Operation
4.4
Operation with parallel control and monitoring
4.4.1
Start the pump
Start the nEXT pump by linking the Start/Stop control input to the 0 V control reference on the logic interface
connector. The pump will then accelerate to full operating speed.
The green indicator on the Controller will illuminate when the pump reaches Normal speed (this is 80% of full
rotational speed by default but you may have selected a different value to suit your application).
4.4.2
Running at standby speed
To run the nEXT pump at Standby Speed, link the Standby control input to the 0 V control reference on the logic
interface connector. If the pump is currently below Standby Speed then it will accelerate until it reaches Standby
speed. If it is running faster than Standby Speed, it will decelerate until Standby Speed is reached.
To return the pump to full speed, disconnect the Standby control input from the 0 V control reference on the logic
interface connector.
4.4.3
Stop the pump
Stop the nEXT pump by disconnecting the Start/Stop control input from the 0 V control reference on the logic
interface connector. The pump rotor will decelerate to rest.
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 you are using a TAV solenoid valve controlled by the Controller, you may wish to close it before starting the nEXT
pump. This will allow the backing pump to reduce the pressure in your vacuum system.
To close the vent valve, send the following command:
The reply you receive 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 you send a stop command to the pump the override is cleared.
Command
!
c
8
7
5
sp
1
cr
Reply
*
c
8
7
5
sp
r
cr
Summary of Contents for nEXT240
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