Edwards nEXT nEXT85 - Parallel Monitoring; Operation with Serial Control and Monitoring; Delayed Start; Start the Pump

WARNING: EXPOSURE TO BACK E.M.F
Risk of injury or damage to equipment. Do not remove the controller from the pump
unl the pump stops completely. 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 when stopped.
To stop the pump, disconnect the start/stop control input from the 0 V control reference
on the logic interface connector.
6.3.4 Parallel monitoring
The parameters that follows can be monitored:
▪
Analogue output
▪
Normal signal
▪
Fail signal
Refer to Connect the parallel control and monitoring on page 43 for instrucons on how
to monitor the signals.
6.4 Operaon with serial control and monitoring
6.4.1 Delayed start
If using a TAV solenoid valve controlled by the motor controller, it can be closed before
starng the pump. This allows the backing pump to decrease the pressure in the vacuum
system.
To close the vent valve, send the command that follows:
Command ! c 8 7 5 sp 1 cr
The reply is as follows:
Reply * c 8 7 5 sp r cr
Note:
This command overrides the current vent opon and closes the vent valve. There is no
command to open the vent valve but, when a stop command is sent to the pump, the
override will be cleared.
6.4.2 Start the pump
WARNING: EXPOSED ROTOR
Risk of injury. Do not operate the pump with its rotor exposed. Connect the pump to
the vacuum system before you operate the pump. If the pump is operated with its
rotor exposed, the pump rotor can cause injury as it rotates at high speeds and the
rotang blades can not be visible.
Page 73
B8G000880_D - Operaon