FAULT FINDING
36
M200–LV M250–LV
FAULT
CAUSE
REMEDY
’Power on’. L.E.D. does
CONTROL VOLTAGE NOT
Check the control fuses.
not illuminate.
AVAILABLE
Check the transformer secondary windings for the control voltage.
Controller indicates trip
condition.
CONTROL CIRCUIT
INTERRUPTED BY A SAFETY
DEVICE
Check machine for indicated fault. Attempt to ’reset’ the controller. If the fault
persists investigate further.
Compressor trips
INSUFFICIENT COOLANT
Check the coolant level.
indicating a high
compressor
CIRCULATION
Check that the coolers are clean.
compressor
temperature.
Check the coolant system for blockages.
Check the operation of thermostatic valve.
POOR ELECTRICAL
CONNECTION
H.A.T. thermistors fail-safe. The unit will trip due to open or short circuit.
INSUFFICIENT COOLING TAKING
PLACE
Check that the cooling air flow is not obstructed at:
. The inlet grille
. The cooler matrix
. The exhaust vents
Check that the ducting (if fitted) is the correct size.
EXCESSIVELY HIGH AMBIENT
TEMPERATURE
(i.e. greater than 46
o
C (115
o
F).
Improve the ventilation to the compressor room.
Compressor trips and
indicates
motor overload.
EXCESSIVE CURRENT HAS
CAUSED THE THERMAL
OVERLOAD (MOL) TO TRIP
Check the actual operating pressure and lower the setting if it is too high. Isolate
the electrical supply and check that the airend and motor rotate freely. Check the
separator element for excessive pressure drop.
Check that the mains voltage is not below the specified value.
Compressor shutdown.
ISOLATION VALVE CLOSED.
Open the valve and restart.
Display shows
OVERPRESSURE.
BLOWDOWN SYSTEM
Check the operation of the load solenoid.
OVERPRESSURE.
INEFFECTIVE.
Check the operation of the unloader valve – strip and clean if necessary.
Compressor will not
DEMAND TOO HIGH
Check for leaks, open service valves or exceptionally high demand.
build up rated pressure.
OFFLINE PRESSURE SET TOO
LOW
Check the offline pressure setting.
Compressor will not
load.
INLET VALVE NOT OPENING
Ensuring that all power to the machine is switched off, check that the valve is free
to open.
Check the operation of the stepper motor.
Compressor fails to
–
Check the operation of the inlet valve.
deliver rated
capacity.
Check the operation of the stepper motor.
capacity.
Check the offline/online pressure setting.
Check the inlet filter for contamination. The L.E.D. should indicate if it is blocked.
Excessive coolant
BLOCKED SCAVENGE LINE
Clear the blockage.
consumption.
RUPTURED OR FOULED
SEPARATOR ELEMENT
Change the element.
Rapid cycling or
RAPID LOAD/UNLOAD CYCLING
Duty cycle too rapid – Increase system capacity.
receiver will not
blow–down to unloaded
Change the Intellisys controller to show modulation operation.
blow–down to unloaded
running pressure.
MINIMUM PRESSURE VALVE
(MPV) STUCK OPEN
Strip the MPV, examine and repair if necessary.
Safety valve blows
MPV STUCK CLOSED
Strip MPV, examine and repair if necessary.
when compressor goes
on load.
SAFETY VALVE FAULTY
Check the setting of the safety valve and the rated pressure.
Compressor trips indi-
cating a high com-
pressor temperature.
INSUFFICIENT COOLING TAKING
PLACE
If machine is water cooled or seawater cooled, check that the cooling water is
flowing. Check that there is no air in the water cooling system. Check that the
strainer is not blocked.