Edwards nEXT730D User Manual

7. Operaon
7.1 Be
fore starng the pump
Before starng the pump the vent valve must be closed and pre-start sequence
completed.
7.1.1 Close the vent valve
The vent valve can be closed manually, by using the customer control system or by TAV
solenoid valve.
1. If using a manual vent valve, turn it clockwise to close it.
2. If using the customer control system to drive a vent valve, make sure that the vent
valve is closed.
3. If driving a TAV solenoid valve from the motor controller, the TAV valve will
automacally shut when the pump is started.
4. If using the TIC to operate the vent valve, refer to Operaon with a TIC or TAG on
page 84.
Note:
The backing pump and nEXT pump can be s
tarted at the same me. The nEXT
pump will not be damaged and can operate as an eecve bae, however if the
vacuum system is large (100 litres or larger) it will be more ecient to allow the
backing pump to reduce system pressure to 10 mbar before starng the nEXT
pump. In this case it will be necessary to close the vent valve in advance of starng
the backing pump.
When using the motor controller to control a TAV solenoid valve and operang with
parallel control and monitoring, the valve cannot be shut in advance of starng the nEXT
pump because the facility to send the appropriate serial command is not available. If the
facility to send serial commands is available a delayed start can be performed. Refer to
Delayed start with serial control on page 80.
7.1.2 Pre-start sequence
Complete the pre-start sequence to check that the pump is ready for operaon.
Note:
If the motor c
ontroller has been congured to drive a fan, the fan will automacally start
when power is supplied to the nEXT pump.
1. Turn on the appropriate cooling device (fan or cooling water supply).
2. Start the backing pump.
3. Switch on the power supply to the pump. Check that the three normal, status and
alarm LEDs on the motor controller light up for approximately 0.5 seconds and
then exnguish.
4. Check that the bearing LED is o.
08/2021 - ©E
dwards Limited
Page 75B8J200880_D
300812671_002_C3
B8J200880_D - Operaon

Edwards nEXT730D Specifications

General

Brand	Edwards
Model	nEXT730D
Category	Water Pump
Language	English