Fault Finding - Edwards nES40A Instruction Manual

9. Fault finding

Condition
Pump does not start
Pump does not reach the ultimate pressure
Pumping speed is too low
After switching off pump under vacuum, pressure in system rises too fast
Pump gets too hot
Oil in intake line or in vacuum vessel
Pump's oil consumption too high, oil mist at exhaust
Oil is turbid
Pump is excessively noisy
Fault Pump does not start
Cause Pump is connected incorrectly.
Remedy Connect the pump correctly. Refer
Cause Motor protection switch incorrectly set or fuse is blown.
Remedy Set the motor protection switch properly or change the fuse. Refer
the system
Cause Operating voltage does not match motor.
Remedy Replace the motor.
Cause Motor is malfunctioning.
Remedy Replace the motor.
Cause Oil temperature is below 12 °C (54 °F).
Remedy Heat the pump and pump oil or use a different oil.
Cause Oil is too viscous.
Remedy Use appropriate oil grade. Refer to
Exhaust filter or exhaust line is clogged.
Cause
Remedy Replace the filter or clean the exhaust line. Refer to
page 24.
Fault Pump does not reach the ultimate pressure
Cause There is an external oil leak.
Remedy Repair the pump.
Cause Float valve does not close.
Remedy Repair the valve. Refer to
A35134880_A
A35134880_A - Fault finding
on page 26
on page 27
on page 27
on page 29
on page 29
on page 18.
Check the float valve
Page 26
on page 26
on page 28
on page 28
Connection to the system
Change the oil on page 24.
Replace the exhaust filters
on page 25.
on page 27
on page 18.
Connection to
on
02/2022 - ©Edwards Limited