Edwards nEXT730D User Manual

CAUTION:
Do not disconnect the pump fr
om the electrical supply unl the pump has stopped
completely.
There is an auxiliary connector socket in front of the motor controller where the TAV
vent valve and the Air cooler can be plugged into. Refer to Motor controller auxiliary
connector socket on page 47.
There is a USB port (item 9) which is a service port to be used with the Edwards nST2 PC
soware, using a standard micro-USB cable. This will enable the pump to be congured,
monitored and upgraded without disconnecng from the 48 V d.c. supply. This soware
is available for download from the Edwards' Upgrade website:
www.upgrades.edwardsvacuum.com.
The motor controller has seven indicator LEDs that signal the general status, operaon,
service status of the pump, CAN and serial communicaon and bearing service status.
The LEDs can be used for fault nding if a problem should occur.
The motor controller has a number of built-in safety features to protect the nEXT pumps
from damage in the event of sustained high pressure and temperature.
▪ The electronics constantly monitors the temperature inside the motor controller
and the temperature of the bearing inside the pump. If either part becomes too
hot, the motor controller reduces the power supplied to the pump motor and the
pump speed will drop. If the pump rotaonal speed reduces below 50% of full
speed, the electronics may trip into a Fail condion, depending on the system
conguraon.
▪ If the pump inlet pressure increases, the power supplied to the pump motor
increases t
o counteract the gas friconal load. However, when the built‑in
maximum power limit is reached, the speed of the pump will start to drop. If the
pump rotaonal speed falls below 50% full speed, the electronics may trip into Fail
condion, depending on how the system has been congured. Refer to Time Timer
on page 16.
▪ In the event of an electrical supply failure, the controller uses the motor within the
pump as a generator. This means the nEXT pumps have their own regenerave
supply and do not require a separate baery for emergency power backup. The
regenerated energy is used to maintain the electrical supply to the controller and
any vent valve or fan aached to the controller connector unl the pump speed
falls to below 50% of full rotaonal speed: this will ensure that the vent valve
remains shut unl below 50% of full rotaonal speed and will prevent the pump
from venng at full speed. It also ensures that the serial link and signals on the
parallel interface remain acve unl the pump speed falls below 50%.
3.3 Operaonal features
In addion to the basic start and stop commands, the nEXT pumps have several other
features that allow pump operaon to be tailored to a parcular applicaon.
3.3.1 Power limit seng
Select the maximum power that will be drawn by the pump. The more power supplied,
the quicker the pump will accelerate to reach full speed.
08/2021 - ©Edwards Limited
Page 15B8J200880_D
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B8J200880_D - Overview

Edwards nEXT730D Specifications

General

Brand	Edwards
Model	nEXT730D
Category	Water Pump
Language	English