Milwaukee Electric Tool Corporation
13135 West Lisbon Road
Brookfield, Wisconsin 53005
TEL: (800)
TROUBLE SHOOTING
Always disconnect unit from the power supply system before removing hoist covers or the back cover of control station.
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| Hook fails to stop at end of travel |
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| 1. Limit switch not operating | 1. Check adjustment (See LIMIT SWITCH ADJUSTMENT, page 8). Check connections against wiring diagram. | ||
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| Tighten loose connections or replace. |
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| 2. Brass limit switch nuts not moving on shaft | 2. Check for stripped threads or bent nut guide. | ||
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| 3. Hoist reversing contactor malfunctioning | 3. Remove electrical cover and check reversing contactor. | ||
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| Hoist does not respond to pushbutton |
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| 1. Power failure in supply lines | 1. Check circuit breakers, switches and connections in power supply lines. | ||
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| 2. Wrong voltage or frequency | 2. Check voltage and frequency of power supply against the rating on the nameplate of the motor. | ||
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| 3. Improper connections in hoist or pushbutton | 3. Check all connections at line connectors and on terminal block. Check terminal block on dual voltage hoists for | ||
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| proper voltage connections. |
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| 4. Brake does not release | 4. Check connections to the solenoid coil. Check for open or short circuit. Check for proper adjustment (See BRAKE | ||
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| ADJUSTMENT, page 9). |
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| 5. Faulty hoist reversing contactor | 5. Check coils for open or short circuit. Check all connections in control circuit. Check for burned contacts. | ||
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| Replace as needed. |
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| Hook does not stop promptly |
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| 1. | Hoist overloaded | 1. Reduce load to within rated capacity of hoist. | |
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| 2. | Brake not holding | 2. Check brake adjustment (See BRAKE ADJUSTMENT, page 9). It may be necessary to replace discs. | |
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| Hook moves in wrong direction |
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| 1. | Three phase reversal | 1. Reverse any two wires (except the green ground wire) at the power source (See INSTALLATION 2c, page 5). | |
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| 2. | Improper connections | 2. Check all connections against wiring diagram. | |
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| Hoist hesitates to lift when energized |
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| 1. | Hoist overloaded | 1. Reduce load within rated capacity of hoist. | ||
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| 2. Motor brake requires adjustment | 2. Check motor brake adjustment (See BRAKE ADJUSTMENT, page 9). | ||
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| 3. Worn overload limiting clutch | 3. Replace clutch. | ||
| 4. | Low voltage | 4. Determine cause of low voltage and bring up to within plus or minus 10% of the voltage specified on the motor. | ||
| 5. | Faulty SINPAC® starting switch or start capacitor |
| Measure voltage at the hoist reversing contactor while lifting a load. | |
| 5. Replace faulty component. | ||||
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| (single phase hoists only) |
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| Hook raises but will not lower |
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| 1. | “DOWN” circuit open | 1. Check circuit for loose connections. Check “DOWN” limit switch for malfunction. | ||
| 2. | Broken conductor in pushbutton cable | 2. | Check each conductor in the cable. If one is broken, replace entire cable. | |
| 3. | Faulty hoist reversing contactor | 3. | Check coils for open or short circuit. Check all connections in control circuit. Check for burned contacts. | |
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| Replace as needed. |
| 4. | Loose screw clamps | 4. | Ensure that screw clamps are tightened on the terminal blocks and reversing contactor. | |
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| Hook lowers but will not raise |
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| 1. | Hoist overloaded | 1. | Reduce load to within rated capacity of hoist. | |
| 2. | Low voltage | 2. | Determine cause of low voltage and bring up to within plus or minus 10% of the voltage specified on the motor. | |
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| Measure voltage at the hoist reversing contactor while lifting a load. |
| 3. | “UP” circuit open | 3. Check circuit for loose connections. Check “UP” limit switch for malfunction. | ||
| 4. | Broken conductor in pushbutton cable | 4. | Check each conductor in the cable. If one is broken, replace entire cable. | |
| 5. | Faulty hoist reversing contactor | 5. | Check coils for open or short circuit, check all connections in control circuit. Check for burned contacts. | |
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| Replace as needed. |
| 6. | Faulty capacitor (single phase hoist only) | 6. | Check starting capacitor on motor. Replace if necessary. | |
| 7. | Worn overload limiting clutch | 7. | Replace overload clutch assembly. | |
| 8. | Loose screw clamps | 8. | Ensure that screw clamps are tightened on the terminal blocks and reversing contactor. | |
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| Motor overheats |
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| 1. | Excessive load | 1. | Reduce load to within rated capacity of hoist. | |
| 2. | Low voltage | 2. | Determine cause of low voltage and bring up to within plus or minus 10% of the voltage specified on the motor. | |
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| Measure voltage at the hoist reversing contactor while lifting a load. |
| 3. | Extreme external heating | 3. | As the ambient temperature rises towards the 130°F limitation of the unit, frequency of the hoist operation must be | |
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| limited to avoid overheating of the motor. See ADVERSE ENVIRONMENTAL CONDITIONS, page 4. |
| 4. | Frequent starting or reversing | 4. | Excessive inching, jogging or reversing should be avoided since this type of operation will drastically shorten the life | |
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| of motor, contactor and brake. |
| 5. | Brake dragging | 5. | Check brake adjustment (See BRAKE ADJUSTMENT, page 9). | |
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| Lack of proper lifting speed |
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| 1. | Hoist overloaded | 1. Reduce load to within rated capacity of hoist. | |
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| 2. | Brake dragging | 2. Check for proper brake adjustment or other defects. | |
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| 3 | Low voltage | 3. Ensure that the voltage at the reversing contactor is within ±10% of the nominal voltage while lifting a load. | |
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| 4. Overload limiting clutch intermittently slipping | 4. Replace overload clutch assembly. | ||
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