Atlas Copco GHS 900 VSD+

Instruction book
6996 0227 40 93
7 Problem solving
Warning
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
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 pressure
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 Atlas Copco
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
Membrane of vacuum control
valve defect
Replace membrane
Vacuum pump element out of
order
Consult Atlas Copco
Air leakage
Check the process lines for leakage