Edwards nEXT85 User Manual

• Measured motor controller temperature
• Measured rotor temperature
The analogue output signal ranges from 0 to 10 V and is directly proporonal to the system
parameter (refer to Logic interface on page 16).
Connect the analogue output to a suitable meter or indicator to display the appropriate system
parameter or connect it to the customer control equipment (for example, to operate other
components in the pumping system at preset values).
Only one system parameter can be monitored at a me using the analogue output. However, it
is easy to congure the motor controller to monitor a dierent system parameter (refer to
Analogue signal opons on page 41).
Automac vent opons
An Edwards TAV vent valve can be connected directly to the motor controller. The motor
controller can provide a number of dierent venng opons and can be congured for both a
normally closed and a normally open vent valve.
The motor controller can control the rate of venng. Using this feature the pump can be
vented from full rotaonal speed in a controlled manner that will not damage the pump
bearings. Once the pump rotaonal speed has dropped to below 50% of maximum speed, it is
safe to hard vent (open the vent valve fully).
There are many venng opons available, including:
• Hard vent when rotaonal speed drops below 50%
• Controlled vent when above 50% speed and hard vent below 50% speed
• Hard vent immediately through a suitable restrictor
Controlled venng gives the benet of a quicker ramp down me by controlling the vent rate
through a single large orice across the pump speed range. A full list of the venng opons is
given in Vent opons, vent valve connecon and control on page 44.
In addion there is a feature that allows a delayed start of the nEXT85 pump. With this feature,
the vent valve can be closed before starng the pump. This allows the backing pump to reduce
the pressure in the vacuum system before starng the nEXT85 pump.
Both a TAV and a cooling fan can be controlled at the same me using the ‘Y’ cable adaptor. No
conguraon is required.
Normal speed seng
The normal speed is a user-selectable parameter that can be set from 50% to 100% of full
rotaonal speed.
When the pump reaches normal speed, a signal is available on the normal pin of the logic
interface connector. This signal can be used to control the applicaon since it shows that pump
speed, and therefore vacuum performance, has reached a specic minimum level. The default
seng is 80% of full rotaonal speed. Refer to Normal speed seng on page 39 for
instrucons on altering the normal speed seng.
Electronic braking
The pump has a user selectable electronic braking
opon that is disabled by default. With this
opon disabled, the pump will draw power from the electrical supply when accelerang and
running.
Whilst
decelerang the pump will coast down and no power will be returned to the electrical
supply.
B8G0-00-880A - Overview of the nEXT85
Page 15

Edwards nEXT85 Specifications

General

Brand	Edwards
Model	nEXT85
Category	Water Pump
Language	English