Edwards nEXT730D User Manual

The system may be vented in accordance with the advice given in Ven
t opons, vent
valve connecon and control on page 76.
CAUTION:
Do not open a manual ven
t valve unl the pump rotaonal speed has fallen below
50%, otherwise the rate of pressure rise may be too high, which could damage the
pump. In an emergency only, open the vent valve quickly to decelerate the pump
rotor in the shortest possible me.
If using the motor controller to control a TAV solenoid valve, there is a 2-second delay
between either a stop command being received or a fault condion being detected and
the vent valve opening. This delay allows me for gauges, valves and other equipment to
be switched o before venng occurs.
The green indicator LED on the motor controller will exnguish as rotaonal speed drops
below normal speed. At very low speeds, the yellow indicator LED will ash and will
exnguish when the pump has stopped.
The deceleraon me can be improved by using the electronic braking feature, refer to
Electronic braking opons on page 72.
7.8 Operaon at extreme condions
7.8.1 Operaon with high inlet pressure
If the nEXT pump inlet pressure rises, the power supplied to the pump motor will
increase to counteract the gas friconal load.
The pump rotaonal speed will remain constant unl the peak power level is reached;
beyond this level, the speed of the pump will start to reduce.
If the pump speed falls to below 50% of full rotaonal speed, the mer will start if it is
enabled. If the speed does not recover to above 50% speed before the meout period
expires, the pump will shut down and display a fail signal. If the mer is disabled, the
pump will immediately shut down and display a fail signal if the speed drops below 50%
of full rotaonal speed. Refer to Electrical data on page 34 for the maximum power
delivered to the pump and to , for maximum allowable inlet pressure.
7.8.2 Operaon at high temperatures
Temperature sensors within the pump mechanism and electronics are monitored by an
internal system.
If the system detects that any internal temperatures are too high, the power supplied to
the pump motor is reduced; the pump may not therefore be able to maintain full
rotaonal speed if it is too hot.
If the pump speed falls to below 50% of full rotaonal speed, the mer will start if it is
enabled. If the speed does not recover to above 50% speed before the meout period
expires, the pump will shut down and display a fail signal. If the mer is disabled, the
pump will immediately shut down and display a fail signal if the speed drops below 50%
of full rotaonal speed. Refer to Table: Operang and storage condions for pump
operang ranges and Cooling on page 63 for advice on pump cooling.
08/2021 - ©Edwards Limited
Page 85B8J200880_D
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B8J200880_D - Operaon

Edwards nEXT730D Specifications

General

Brand	Edwards
Model	nEXT730D
Category	Water Pump
Language	English