42.
7.0
TROUBLESHOOTING GUIDE
7.1 FAILURE TO START
POSSIBLE CAUSE
CORRECTION
Power not turned “ON”.
Turn “ON” by closing the main disconnect.
Blown control circuit fuse.
Find and correct cause. Replace fuse on transformer or power
supply.
Blown 460 volt Phase Protector fuse
(s)
Find and correct cause. Replace fuse(s).
High air temperature switch open.
(see “High Discharge Air
Temperature”, Section 7.9)
See Description of Operation for verification of input LED
condition.
Overload relays tripped.
Correct the cause of the overload condition reset; the overload
and press the reset keypad. See Description of Operation /
Display and Controls manual.
Faulty starter contactor.
Check the contactor for malfunction, burnt contacts, or loose
connections.
Power failure.
Check incoming power supply.
Defective sensor.
Check pressure switch, temperature switch or remote device.
See Description of Operation.
Loose wire connections.
Check all wiring terminals for contact and tightness.
Faulty power supply.
Check 120 VAC and 24 VDC power.
Alarm not reset.
Correct fault and reset alarm.
Start Delay Timer is still counting
down.
Wait for counter to reach zero.
7.2 UNSCHEDULED SHUTDOWN
POSSIBLE CAUSE
CORRECTION
High air discharge temperature (see
“High Discharge Air Temperature”,
Section 7.9)
Check Compressor Display and see Description of Operation for
verification.
Thermal overload relays tripping.
See “Overload Relay Tripping”, Section 7.3.
Power failure.
Check incoming power supply.
Defective sensor.
Check pressure switch, temperature switch or remote device.
See Description of Operation.
Loose wire connections.
Check all wiring terminals for contact and tightness.
High reservoir pressure.
See “High Reservoir Pressure”, Section 7.8.
Faulty Compressor Control Display.
See Description of Operations. Replace as necessary.
7.3 OVERLOAD RELAY TRIPPING
POSSIBLE CAUSE
CORRECTION
Excessive discharge pressure.
Lower full load pressure setting at pilot valve and/or at
Compressor Display panel.
Low voltage and/or power factor
and/or voltage imbalance.
Check voltage, amperages and power factor while operating the
unit at full load and full pressure.
Incorrect overload setting.
Check motor name plate and compare to overload setting within
Compressor Control panel.
Faulty motor.
Remove motor and have tested at motor manufacturer repair
center.
Summary of Contents for KI Series
Page 1: ...1 Model __________________ Serial __________________ Rotary Screw Air Compressors...
Page 8: ...7 INTENTIONALLY BLANK...
Page 9: ...8 CHAPTER 1 GENERAL INFORMATION...
Page 19: ...10 CHAPTER 2 INSTALLATION INSTRUCTIONS...
Page 26: ...17 CHAPTER 3 ELECTRICAL INFORMATION...
Page 30: ...21 CHAPTER 4 COMPRESSOR LUBRICANT...
Page 39: ...30 INTENTIONALLY BLANK...
Page 40: ...31 CHAPTER 5 AIR INLET FILTER INFORMATION...
Page 43: ...34 INTENTIONALLY BLANK...
Page 44: ...35 CHAPTER 6 COMPRESSOR OPERATIONS...
Page 49: ...40 INTENTIONALLY BLANK...
Page 50: ...41 CHAPTER 7 TROUBLESHOOTING...
Page 57: ...48 CHAPTER 8 FORMS RECORDS AND ELECTRICAL SCHEMATICS...
Page 58: ...49...
Page 59: ...50...
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Page 65: ...56 INTENTIONALLY BLANK...
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