6. Operaon
6.1 Be
fore starng 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
automacally when the pump is started.
▪ If you use the TIC to operate the vent valve, refer to Operaon with a TIC on page
75.
Note:
The backing pump and nEXT pump can be s
tarted at the same me. The
nEXT pump will not get damaged and can operate as an eecve bae. If the
vacuum system is large (100 litres or larger) it will be more ecient 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
71.
6.1.2 Pre-start Sequence
Note:
If the motor c
ontroller has been congured to operate a fan, the fan will start
automacally 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 exnguish.
Refer to Fault nding on page 82 if:
▪ LEDs does not illuminate
▪ Red or yellow LEDs ashes in a repea
ted sequence
▪ Red LED is illuminated.
04/2022 - ©Edwards Limited
Page 70B80000880_G
B80000880_G - Operaon
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