Section VII - Problem Solving
Warning
CAUTION!
Before carrying out any maintenance, repair work or adjustment, stop vacuum pump,
close the air inlet valve and wait 3 minutes.
Press the emergency stop button and switch off the voltage.
Vent the vacuum pump by opening the plug on the cover of the air inlet filter.
For location of components, see sections:
• Introduction.
• Operation instructions
• Maintenance.
Open and lock the isolating switch.
Lock the air inlet valve during maintenance or repair.
The operator must apply all relevant Safety precautions.
Before electrical maintenance
CAUTION!
Wait for at least 10 minutes before starting any electrical repairs as dangerous high
voltage remains on the capacitors of the start and speed regulation unit during some
minutes after switching off the voltage.
Faults and remedies, vacuum pump
If the alarm LED is lit or flashes, consult sections Event history menu or Service menu.
Condition
Fault
Remedy
The pump
cannot reach
ultimate pres-
sure
Air leakage in the inlet piping connections
Check for leakages in the inlet filter
assembly and piping. Check sealing
between components
Low oil level
Top-up oil
Oil contaminated
Replace oil
Solenoid-valve malfunctioning
Replace valve
Membrane of vacuum control valve defect
Replace membrane
Vacuum pump element out of order
Consult Quincy
The pump
cannot reach
stated vacuum
Air consumption exceeds air delivery of
vacuum pump
Check equipment connected
Clogged air filter element
Replace the filter
Too high pressure drop between process
and pump inlet
Check the process lines for correct size
and for leakage. Correct if necessary
Low oil level
Top up oil
Oil contaminated
Replace oil
Solenoid valve malfunctioning
Replace valve
Quincy Vacuum Pump-QSV Series
87
