Trouble: Motor does not start (does not hum).
- Check all motor controls for proper wiring. Make sure magnetic starter coil is energized by voltage between L1 & L2 or by control power from a separate source. DO not have one side of coil wired to T3.
- Check all fuses and heaters for proper sizing as shown on Page 5. Replace if necessary.
- Check all connections from converter terminals to motor. Connections should be as shown on Pages 3 or 5.
- Check voltage between terminals T1 & T2. Voltage should be 220 – 250 Volts for 230 Volt H-A-S and should be 430 – 480 Volts for 460 Volt H-A-S.
Trouble: Motor does not start (but does hum or rotate slowly).
- Check for incorrect or crossed wires between motor and converter.
- VERY IMPORTANT! Using an accurate voltmeter, check voltage between T1 & T2 on the H-A-S while motor is trying to start! If the voltage drops below 210 Volts for 230 Volt H-A-S or below 420 Volts for the 460 Volt H-A-S, the service wire or the transformer is too small. The transformer should be at least 1 KVA per horsepower. The table on Page 5 lists wire sizes for installations that do not exceed 50 feet.
- Check all parts per procedure shown below.
Trouble: Motor starts but slows down after full speed has been reached or re-enters the starting cycle.
- Check voltage from T1 & T2. Voltage must be at least 210 Volts for 230 Volt H-A-S and 420 Volts for the 460 Volt H-A-S.
- Check Run Capacitors and replace if defective (see Checking Parts below).
- Motor may be overloaded if this problem is not encountered under “no load” conditions. (see Installation Checkout Instructions on Page 10 for no load conditions). Check full load amps T1 prior to re-entering the starting cycle, and if amperage exceeds vaule calculated from Explanation of Operation on Page 6, the motor is overloaded. Reduce load or replace motor and converter with a larger HP size. Remember, the converter must be the same HP size as the motor.
Trouble: Motor starts and runs properly except heaters trip overload relay.
- Check for undersized heater coils. See Explanation of Operation on Page 6 for calculation of heater coil sizes.
- Check for overload. If L1 amperage calculated in 1 above is exceeded when measured with an ammeter, the motor is overloaded.
- Check for excessive amperage for T3 with an ammeter. If amperage calculated in 1 above is exceeded under normal load conditions, the converter requires adjustment of its run capacitance. Complete Factory Troubleshooting Data Sheet on Page 9 and consult factory.
Trouble: Relay Chatters.
- Adjust the Relay Control according to Instructions on Page 3.
- Check voltage from T1 to T3. Compare reading to values shown on Installation Checkout Instructions on Page 10. If value does not fall within the range given, complete Factory Troubleshooting Data Sheet on Page 9.
Trouble: Motor heats abnormally.
- Check for overload (See appropriate table for amperages on Page 4.)
- Check for low voltage.
- Check for improper or loose connections.
- If problem is not solved by 1,2, or 3 above, complete Factory Troubleshooting Data Sheet on Page 9 and consult factory.
Trouble: Run Capacitors repeatedly become defective.
- Complete Factory Troubleshooting Data Sheet on Page 9, and consult factory.
Trouble: Electrolytic Capacitors repeatedly become defective.
- Check duration of starting cycle (must not exceed 15 seconds).
- Check motor for severe overload (the motor may re-enter the starting cycle repeatedly).
- Check for burned discharge resistors. Resistors should read approximately 10,000 ohms each.
- If a problem is not solved, complete Factory Troubleshooting Data Sheet on Page 9 and consult factory
PROCEDURES FOR CHECKING PARTS
- Remove capacitors completely from circuit and check for sorts (use ohmmeter only).
- Look for traces of oil oozing from capacitors. This indicates capacitor has been overheated and capacitor may be defective. Check for short circuits.
- If capacitor is swollen or disfigured, it is definitely bad and should be replaced.
- Check amperage in leads going to capacitor when in operation. If capacitor is open, no amperage will flow.
- Remove from circuit and check for short circuits or grounds (use ohmmeter only).
- Using ohmmeter, check control for continuity, opens, or grounds.
- A good resistor should read approximately 2500 Ohms across its two outside terminals.
Relay, Normally Closed
- Check coil with an ohmmeter for opens or grounds.
- Check armature for sticking or for faulty contacts.
Contactor, Normally Open
- Check same as for normally closed relay.
- If contactor is checked by energizing coil, remember that contactor must be in a vertical or upright position for proper operation.