Edwards nEXT nEXT85 - Operation; Before Starting the Pump; Close the Vent Valve; Pre-Start Sequence

6. Operaon
6.1 Before starng the pump
Before you start the pump:
▪ close the vent valve
▪
make sure that the pre-start sequence is completed.
6.1.1 Close the vent valve
You can manually close the vent valve by using the customer control system or TAV5
solenoid valve.
1.
If you use a manual vent valve, turn it clockwise to close the vent valve.
2.
If you use the customer control system to drive a vent valve, make sure that the
vent valve is closed.
3.
If you operate a TAV solenoid valve from the motor controller, the TAV valve will be
closed automacally when the pump is started.
4. If you use the TIC to operate the vent valve, refer to Operaon with a TIC or TAG on
page 77.
Note:
The backing pump and nEXT85 pump can be started at the same me. The nEXT85
pump will not get damaged and can operate as an eecve bae. If the vacuum
system is large (100 litres or larger), it will be more ecient to allow the backing
pump to decrease the system pressure to 10 mbar before you start the nEXT85
pump. Close the vent valve before you start the backing pump.
When you use the motor controller to control the TAV solenoid valve and operate with
parallel control and monitoring, you cannot close the valve before starng the nEXT85
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 73.
6.1.2 Pre-start sequence
Complete the pre-start sequence to check that the pump is ready for operaon.
Note:
If the motor controller has been congured to operate a fan, the fan will start
automacally 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.
Set the power supply to the pump to on.
4.
Check that the three LEDs (normal, status and alarm LEDs) on the motor controller
illuminate for approximately 0.5 seconds and then exnguish.
Page 67
B8G000880_D - Operaon