Edwards nEXT300 User Manual

If operang the pump a
t maximum speed at all mes is not necessary for the
applicaon, use the standby speed feature rather than seng the pump to o. You can
use the standby speed feature for tuning the vacuum system or as a power saving opon
for the system.
The standby speed is a user‑selectable value. Refer to Standby speed seng on page 65.
2.4.3 Timer
When the pump is started, an internal mer starts automacally in the drive electronics.
The default mer seng is 8 minutes.
If the pump fails to reach 50% of full rotaonal speed in the meout period, the motor
controller will signal a fail and decelerate the pump to rest. This feature prevents the
motor controller from driving the pump at maximum power for a long me. The pump
can fail to reach 50% speed if the gas load is too high (for example if there is a leak in the
system), if the backing pump fails or if the pump is too hot.
The meout period is user‑selectable (refer to Timer seng and opons on page 66). If
slow ramp‑up of the pump is necessary for the applicaon, extend the meout period.
The mer is permanently enabled for ramp‑up.
If the rotaonal speed of the pump decreases below 50% of the full speed, the pump
me can be set to recover rather than trigger a fail condion. The mer starts
immediately when the rotaonal speed of the pump decreases below 50% of the full
speed. If the rotaonal speed of the pump increases above 50% during the meout
period, the mer will reset. If the rotaonal speed of the pump does not recover by the
end of the meout period, the motor controller will trigger a fail condion and
decelerate the pump to rest.
The mer funcon is enabled when the pump is shipped. You can disable the mer
funcon. If the mer funcon is disabled, the pump will fail and decelerate to rest
immediately when the rotaonal speed of the pump decreases below 50%.
2.4.4 Analogue output
The pump controller produces an analogue output for monitoring four dierent system
parameters:
▪ Measured pump rot
aonal speed (default condion)
▪ Measured motor power
▪ Measured motor temperature
▪ Measured controller temperature.
The range of the analogue output signal is from 0 to 10 V and is directly proporonal to
the system parameter. Refer to Logic interface connector on page 31.
Connect the analogue output to an applicable meter or indicator to display the
applicable system parameter or connect it to the customer control equipment (for
example, to operate other components in the pumping system at set values).
The analogue output can monitor only one system parameter at a me. You can
congure the controller to monitor dierent system parameter. Refer to Analogue signal
opons on page 67.
04/2022 - ©Edwards Limited
Page 14B80000880_G
B80000880_G - Intr
oducon

Edwards nEXT300 Specifications

General

Brand	Edwards
Model	nEXT300
Category	Water Pump
Language	English