Section Vii - Problem Solving - Quincy Compressor QOF 2 Instruction Manual

Section VII - Problem solving

Attention
1. Before carrying out any maintenance, repair work or adjustment, switch off the
voltage.
2. Open and lock the isolating switch to prevent an accidental start.
3. Isolate the compressor by closing the outlet valve.
4. Depressurize the system by opening the drain valve(s).
Compressor
Condition
The compressor
does not start.
The compressor
does not stop
and/or safety
valve blows.
Pressure
difference
between stopping
and starting
cannot be
adjusted
Compressor
capacity or
pressure below
normal
34
Fault
Pressure too high.
On/off switch (Q1)
malfunctioning or loose
connection
Thermal overload of switch (Q1)
Switch (TSHH) open or motor
protection relay (F21) tripped
Air pressure switch (PS) out of
order
Air pressure switch (PS) opens
too late or not at all.
Safety valve (SV) opens too
soon.
Air pressure switch (PS) out of
order
Air consumption exceeds
capacity of compressor.
Choked air filter
Safety valve leaking
Drive belts slipping.
Compressor element out of
order
Quincy Compressor
Remedy
Compressor will start again
when the pressure drops to the
starting pressure.
Have electrical connections
checked.
Test switch. Replace if necessary.
Restart after cooling down.
Wait for switch to cool down.
Replace switch if necessary.
Reset overload relay (F21).
Test switch, replace if necessary.
Readjust switch, replace if
necessary.
Have valve replaced.
Replace if necessary.
Check equipment connected.
Remove and check filter.
Replace if necessary.
Replace valve.
Check condition of belts and
belt tension.
Correct or replace as required.
Consult the supplier.