Edwards nEXT85 User Manual

Motor controller
The motor controller contains the drive electronics that control the pump operaon, the TAV
vent valve and the air cooler.
CAUTION:
Do not remove power to the pump unl the pump has stopped completely.
There is an auxiliary connector socket on the side 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 101).
There is a USB port (item 9 in Figure 4 on page 30) which is a service port to be used with the
Edwards nST 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 24 - 48 V d.c. supply. This
soware is available for download from the Edwards' Upgrade website:
www.upgrades.edwardsvacuum.com
Currently, nST soware requires a free license in order to be used. To obtain a free license
follow the onscreen
instrucons, ll out the user data form and then send the automacally
generated email to Edwards.
The motor controller has ve indicator LEDs that signal the general status, operaon, service
status of the pump and serial communicaon. The LEDs can be used for fault nding if a
problem should occur. (Refer to Indicator LEDs on page 102).
The motor controller has a number of built-in safety features to protect the nEXT85 pumps
from damage in the event of sustained high pressure or temperature.
• The electronics constantly monitors the temperature inside the motor controller and
the temperatures of the rotor and motor within 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 falls below 50% of full speed, the
electronics may trip into a Fail condion, depending on the system conguraon.
(Refer to Timer on page 14).
• If the pump inlet pressure increases, the power supplied to the pump motor increases
to 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 Timer on page 14).
• In the event of an electrical supply failure, the motor controller uses the motor within
the pump as a generator. This means the nEXT85 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 motor controller
and any vent valve or fan aached to the motor controller connector unl the pump
speed falls to below 50% of full rotaonal speed: this will ensure that when using a
normally open vent valve it will remain 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%.
Operaonal features
In
addion to the basic start and stop commands, the nEXT85 pumps have several other
features that allow pump
operaon to be tailored to a parcular applicaon.
B8G0-00-880A - Overview of the nEXT85
Page 13

Edwards nEXT85 Specifications

General

Brand	Edwards
Model	nEXT85
Category	Water Pump
Language	English