Edwards nEXT400 User Manual

the controller decreases the power supplied to the pump motor and the pump
speed decreases. If the r
otaonal speed of the pump decreases below 50% of the
full speed, the electronics can trip into a fail condion, depending on the system
conguraon. Refer to Timer on page 14.
▪ If the inlet pressure of the pump increases, the power supplied to the pump motor
increases to counteract the gas friconal load. When the built‑in maximum power
limit is reached, the speed of the pump starts to decrease. If the rotaonal speed
of the pump decreases below 50% of the full speed, the electronics can trip into
fail condion, depending on how the system has been congured. Refer to Timer
on page 14.
▪ If the electrical supply fails, the controller uses the motor in the pump as a
generator. This means the pump has its own regenerave supply and a separate
baery for an emergency power backup is not necessary. The regenerated energy
maintains the electrical supply to the controller, the vent valve or the fan aached
to the controller connector unl the pump speed decreases below 50% of the full
rotaonal speed to make sure that the vent valve stay shut unl below 50% of the
full rotaonal speed and prevent the pump from venng at a full speed. It makes
sure that the serial link and signals on the parallel interface stays acve unl the
pump speed decreases below 50%.
2.4 Operaonal features
The nEXT pumps have the basic start and stop commands and some other features that
allows the pump operaon to be modied for an applicable applicaon. Refer to Table:
Logic interface technical data for factory default sengs of the parameters given in the
secons that follows.
OEM supplied pumps can have drive parameters and default user‑selectable sengs.
The drive parameters and default user‑selectable sengs can be dierent from the
parameters given in the instrucon manual to suit specied process requirements.
Contact OEM for more informaon and advice.
2.4.1 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.
If the applicaon requires fast cycling or higher gas loads, set the power limit to the
maximum value. If ramp me is not important in the applicaon, use a lower power
limit, down to a minimum value (refer to Table: Power limit seng). Also ensure there is
sucient cooling for the applicaon.
Ensure that the power supply is capable of delivering sucient power to the nEXT pump.
By choosing a lower power limit seng, a smaller power supply may be used. For more
informaon, refer to Electrical data on page 29.
2.4.2 Standby speed
In standby mode, the pump rotaonal speed is lower than the full rotaonal speed. The
default seng for standby speed is 70% of the full speed.
To operate the pump at standby speed, it must be in the start condion.
04/2022 - ©Edwards Limited
Page 13B80000880_G
B80000880_G - Intr
oducon

Edwards nEXT400 Specifications

General

Brand	Edwards
Model	nEXT400
Category	Water Pump
Language	English