Edwards nEXT730D User Manual

▪ Measured motor controller temperature
▪ Measured bearing temperature
The analogue output signal rang
es from 0 to 10 V and is directly proporonal to the
system parameter (refer to Logic interface on page 18).
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 controller to monitor a dierent system parameter
(refer to Analogue signal opons on page 72).
3.3.5 Automac vent opons
The manufacturer's 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 rot
aonal speed drops below 50% speed
▪ 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 76.
In addion there is a feature that allows a delayed start of the nEXT 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 nEXT 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.
3.3.6 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 70 for instrucons on altering the normal speed seng.
3.3.7 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
08/2021 - ©Edwards Limited
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B8J200880_D - Overview

Edwards nEXT730D Specifications

General

Brand	Edwards
Model	nEXT730D
Category	Water Pump
Language	English