Edwards nEXT85 User Manual

Operaon of the nEXT85
Before starng the pump
Before starng the pump the vent valve must be closed and pre-start sequence completed.
Close the vent valve
The vent valve can be closed manually, by using the customer control system or by TAV5
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
53.
Note:
The backing pump and nEXT85 pump can be started at the same me. The nEXT85 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 nEXT85 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 nEXT85 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 .
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 drive a fan, the fan will automacally start
when power is supplied to the nEXT85 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.
If the LEDs do not light up as expected, or if the red or yellow LEDs begins to ash a repeated
sequence or if the red LED is lit, refer to Troubleshoong on page 65.
Vent opons, vent valve connecon and control
Note:
If manually venng the pump when it is at full rotaonal speed and the subsequent rate of
pressure rise is too high, the pump life may be reduced. When using the manual vent valve
B8G0-00-880A - Operaon of the nEXT85
Page 44

Edwards nEXT85 Specifications

General

Brand	Edwards
Model	nEXT85
Category	Water Pump
Language	English