Edwards nEXT400 User Manual

If you use the controller to control a TAV solenoid valve, there is a 2‑second dela
y
between receiving a stop command (or detecng a fault condion) and opening the vent
valve. The delay allows me for gauges, valves and other equipment to be switched o
before venng occurs.
The green indicator LED on the controller will exnguish as rotaonal speed drops below
normal speed. At very low speeds, the yellow indicator LED ashes. The yellow indicator
LED exnguishes when the pump has stopped.
6.7 Operaon at extreme condions
6.7.1 Operaon with high inlet pressure
If the pump inlet pressure increases, the power supplied to the pump motor will
increase to counteract the gas friconal load.
The pump rotaonal speed will stay constant unl the peak power level is reached. Aer
the peak power level, the speed of the pump will start to decrease.
If the pump speed decreases below 50% of full rotaonal speed, the mer will start (if it
is enabled). If the speed does not recover to more than 50% speed before the meout
period expires, the pump will stop and display a fail signal. If the mer is disabled, the
pump will stop immediately and display a fail signal if the speed decreases below 50% of
the full rotaonal speed. Refer to Electrical data on page 29 for the maximum power
delivered to the pump. Refer to Table: nEXT pumps technical data for maximum
permied inlet pressure.
6.7.2 Operaon at high temperatures
Temperature sensors in the pump mechanism and electronics are monitored by an
internal system. If the system detects that internal temperatures are too high, the power
supplied to the pump motor is reduced, the pump can possibly not be able to maintain
full rotaonal speed if it is too hot.
If the pump speed decreases below 50% of the full rotaonal speed, the mer will start
(if it is enabled). If the speed does not recover to more than 50% speed before the
meout period expires, the pump will stop and display a fail signal. If the mer is
disabled, the pump will stop immediately and display a fail signal if the speed decreases
below 50% of the full rotaonal speed. Refer to Operaon and storage environment on
page 27 for pump operang ranges. Refer to Cooling on page 60 for advice on pump
cooling.
6.7.3 Protecon against over-speed
Control soware in the motor controller control the pump rotaonal speed and prevents
the operaon of the pump more than its normal full rotaonal speed.
If the control soware fails, the motor controller has a built‑in safety circuit that checks
if the pump is operang at over‑speed. If an over‑speed condion is detected, the motor
controller automacally stops the power to the pump motor, slows the pump and stop.
The motor controller signals a fail condion if over‑speed is detected.
If the pump is operang at over‑speed, set the pump to o and contact us or the
supplier.
04/2022 - ©Edwards Limited
Page 76B80000880_G
B80000880_G - Operaon

Edwards nEXT400 Specifications

General

Brand	Edwards
Model	nEXT400
Category	Water Pump
Language	English