Edwards nEXT300 User Manual

Cause The high vacuum area of the system is contaminated.
Remedy Clean the high vacuum system.
Cause Check the system for leaks and contaminaon.
Remedy If a leak is found, repair it and clean the contaminaon.
Cause The inlet pressure is less.
Remedy
▪ Remove the pump from the system and test the ulmat
e pressure of the
pump only.
▪ Check the pump for contaminaon.
Do the leak test of the pump. If the leak rate more than
1x10
-7
mbar l s
-1
(1x10
-5
Pa l s
-1
), contact us or the supplier.
Fault The pump is very noisy or there is excessive vibraon or both
Cause The
rotaonal speed of the pump is same as the r
esonant frequency of the
aached system.
Remedy Change the natural frequency of the system or isolate the pump using exible
bellows.
Cause The vibraon is
transming from the rotary backing pump.
Remedy Install a exible bellows or a vibraon isolator in the backing line.
Cause The noise is irregular and increasing.
Remedy A defecve bearing. Con
tact us or the supplier.
Cause The pump makes a constant high pitched noise.
Remedy The rotor is out of balance. Contact us or the supplier.
Fault No serial comms
Cause No electrical supply, loss of serial link.
Remedy Check that:
▪ the electrical supply is on.
▪ the serial link is connected.
▪ the serial enable line is acv
e.
Cause Slide s
witch is not in the correct posion for R
S232 or RS485.
Remedy Check that:
▪ the electrical supply is on.
▪ the serial link is connected.
▪ the serial enable line is acve.
▪ Le for RS485, right for RS232.
▪ Right for parallel control and monitoring.
Cause Incorrect baud rate and node address.
Remedy Check baud rate and, if operang in mul-dr
op mode, the node address matches
those of the pump.
04/2022 - ©Edwards Limited
Page 84B80000880_G
B80000880_G - Fault nding

Edwards nEXT300 Specifications

General

Brand	Edwards
Model	nEXT300
Category	Water Pump
Language	English