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Low voltages may lead to high motor currents. The overload relay will sense these and shut down the
compressor to protect the motor. If voltage is low while the compressor is off, locate and correct the
cause. If the voltage drops low only while the compressor is running, look for poor connections or
undersized wiring.
If any of the starters or contactors within the box chatter, or if the electronic controller drops out while
attempting to start, it is a clear indication that the wiring is inadequate for the compressor. Look for poor
connections or undersized wiring.
OTHER CONTROLS TROUBLESHOOTING
If the overload relay has tripped, disconnect and lock out power. Check all line and load connections to
the starter for proper torquing. Check that the overload relay is properly adjusted per the instructions
glued inside the control box. Look for any additional sources of heat which may affect the overload relay.
Reset the relay by pressing the reset button on the relay. Close up the box and restore power.
If overload problems persist, contact a qualified electrician or motor shop. Measure all incoming voltages
with the motor off and at full load. Measure amps while running full load. Correct wiring if voltages are
outside of limits or if imbalance is found in any of the sets of readings. If voltages are okay, but amps are
high, reduce the load on the motor.
Remember that the overload relay is designed to protect both the motor and the wiring. Do not misadjust
this protection.
If the Auto light is steadily lit, but motor does not start, check the starter coil and wiring from the controller
to the coil.
If the Auto light is steadily lit, but the compressor does not load, check the solenoid valve coil, the motor
starter contact, and the wiring from the controller to these components.
If pressure drops, but the Auto light does not stop flashing, check the adjustment and connections of the
pressure switch.
If the pressure rises, but the Auto light stays lit steadily, check the adjustment and connections of the
pressure switch.
NOTICE
Champion factory remanufactured replacement compressor airend units are
available from your authorized distributor, on an exchange basis, for all rotary
screw compressor units.
Summary of Contents for CHAMPION ROTORCHAMP EFB99B
Page 9: ...13 8 620 Page 2 13 8 620 Page 2 300EFB797 A Ref Drawing Figure 1 2 COMPRESSOR ILLUSTRATION...
Page 12: ...13 8 620 Page 5 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...
Page 13: ...13 8 620 Page 6 DECALS 216EAQ077 217EAQ077 222EAQ077 221EAQ077 208EAQ077...
Page 30: ...13 8 620 Page 23 Figure 4 3 WIRING DIAGRAM 300EFB542 D Ref Drawing...