Edwards nEXT200200, Instruction Manual

Page: 68 / 100

6. Operation
6.1 Before starting the pump
Before you start the pump, obey the steps that follows.
6.1.1 Close the vent valve
▪ If you use a manual vent valve, turn it clockwise to close the vent valve.
▪ If you use the customer control system to drive a vent valve, make sure that the
vent valve is closed.
▪ If you operate a TAV solenoid valve from the controller, the TAV valve will be closed
automatically when the pump is started.
▪ If you use the TIC to operate the vent valve, refer to Operation with a TIC on page
69 .
Note:
The backing pump and nEXT pump can be started at the same time. The
nEXT pump will not get damaged and can operate as an effective baffle. If the
vacuum system is large (100 litres or larger) it will be more efficient to allow the
backing pump to decrease the system pressure to 10 mbar before you start the
nEXT pump. Close the vent valve before you start the backing pump.
When you use the controller to control a TAV solenoid valve and operate with parallel
control and monitoring, you cannot close the valve before you start the nEXT pump (the
facility to send the applicable serial command is not available). If the facility to send
serial commands is available, a delayed start can be done. Refer to Delayed start on page
65 .
6.1.2 Pre-start Sequence
Note:
If the motor controller has been configured to operate a fan, the fan will start
automatically when the power is supplied to the nEXT pump.
1. Turn on the applicable cooling device (fan or cooling water supply).
2. Start the backing pump.
3. Switch on the power supply to the pump.
4. Check that the three LEDs (normal, status and alarm LEDs) on the motor controller
illuminate for approximately 0.5 seconds and then extinguish.
Refer to Fault finding on page 76 if:
▪ LEDs does not illuminate
▪ Red or yellow LEDs flashes in a repeated sequence
▪ Red LED is illuminated.
Page 64
B85200880_D - Operation