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  Drives Service & Support > Legacy > 1330 > 1-5HP > Troubleshooting

Warnings:

  • Use specified incoming line fuses to guard against equipment damage and hazards due to failure of Electrolytic Capacitors.
  • Hazardous voltage levels exist on the Control Printed Circuit Board. Disconnect power, open guard and remove board for servicing.
  • Always remove power from the drive when wires are being connected or reconnected or fuses are replaced. The removal should be done by means of an external disconnect switch. (The STOP push button switch on the door will not remove AC power from the drive.)
  • Do not change adjustments set by the factory.
  • If the procedures detailed here have been completed, or you do not feel you are qualified or comfortable working with high voltage, and the difficulty has not been corrected, consult your nearest Allen-Bradley office.
Symptom Step Diagnostic Procedure Probable Failure or Indication Repair Procedure
Unit does not turn on when the START button switch is pressed. 1 Measure input line voltage between TB1-1 and TB1-2. Line voltage should be between 189 and 253V AC. External line source voltage is not present Check and repair external line voltage source.
  2 Measure input line voltage between TB1-1 to K1-L1, TB1-2 to K1-L2 and TB1-3 to K1-L3. (TB1-3 to K1-L3 measurement not required for single phase option.)Voltage should be zero. 1 or more fuses (F1-F3) are blown Replace blown fuse or fuses. Perform Step A3 before reapplying power.
3

If 1 or more fuses are blown check the following before reapplying AC power:
Use an ohmmeter to check rectifier bridge CR1 as follows:

Ohmeter Reading
+ - --------
CR1(+) CR1-A Infinite
CR1(+) CR1-B Infinite
CR1(+) CR1-C Infinite
CR1-A CR1(-) Infinite
CR1-B CR1(-) Infinite
CR1-C CR1(-) Infinite

 

A low ohmmeter reading.

 

Replace CR1

 

Note: Check F6 and F7 fuses on the control assembly 50282.
4

Remove leads from one side of capacitor C2.

Connect positive (+) ohmmeter lead to capacitor positive (+). Connect negative (-) ohmmeter lead to capacitor negative (-). Set ohmmeter on X1 scale. The meter should immediately read low, then the meter indicator should slowly swing to a high (infinite) reading.

 A sustained low reading indicates C2 is shorted Replace Shorted Capacitor
5

Check for open fuses on the control assembly 50282.

Check F4, F5, F6, & F7

F4 blown - T1 faulty - faulty relay (1CR, 4CR, 5CR).

F5 blown - K1 shorted

F6 and/or F7 blown - Refer to step A3

 Replace blown fuse and/or faulty component
6 Measure AC voltage across connector J8-5 to J8-6 on the control assembly 50282. If voltage is present, relay 1CR may be faulty. If voltage is zero, refer to previous steps A2, A3, and A4. Replace blown fuse, or faulty relay
7 Swing back hinged panel assembly. Confirm that DS1 on the control assembly 50282 is lit.

a. If DS1 is lit, but fuses F6 and/or F7 are not blown, relay 2CR may be faulty.

b. if DS1 is not lit and all fuses are good, logic assembly 50281 may be faulty.

a. Replace 2CR relay.

b. Replace logic assembly 50281.
B. Contactor K1 energizes momentarily then unit trips off. 1

After the unit trips off, but before pressing the STOP push button, look at lights DS2, 3 & 5 on logic assembly 50281.

If DS2 is lit, check line voltage as seen in step A1.

 DS2 lit: High Bus voltage Correct the high input line condition.
  2

If DS3 is lit, set the speed pot to zero, press STOP, wait a moment, then press START push button. Proceed as follows:

a) Observe that DS3 is lit.

b) Observe that DS3 is not lit.

c) Disconnect the motor from the inverter (drive). Confirm that DS3 does not light when the speed pot is turned up to 50% speed.

a) Defective Logic Assembly.

b) The original cause for DS3 to be lit is probably external to the inverter and possibly due to overload, defective motor or wiring.

c) Overload or defective motor or defective wiring.

a) Replace 50281 Logic Assembly.

b) Perform diagnostic procedure 2.C.

c) Repair/replace motor or remove overload.
3 If DS5 is lit, remove AC input power. Swing back the hinged panel assembly. Using Power Switch Assembly Tester, P/N 300003, check each driver module as outlined in the Tester Manual. Shorted power transistor module(s). Replace faulty driver module(s) and return to factory for repair. If a tester P/N 300003 is not available, replace all three driver modules and return them to factory.
c. The unit trips off during normal operation. 1 After the unit trips off, but before pressing the STOP push button, look at lights DS1, 2 and 4 on logic assembly. If DS1 is lit, check input line voltage as in Step A1. DS1 lit: Low line voltage or previous low line voltage transients. Check and correct line voltage condition.
  2

If DS2 is lit, proceed as follows:

a) Measure the input line voltage. Line voltage should not be greater than 253V AC.

b) Restart the unit by pressing STOP, then START push button. Rotate the speed pot until the desired motor speed is achieved. Now rapidly rotate the speed CCW to zero.

 a) Line voltage is marginally high.

b) If the unit trips off, the decel. rate is set too high for the motor/load inertia.

 a) Check and correct line voltage condition.

b) Do one or both of the following:

1) Decrease the deceleration rate, See Section 2.5.0 in this manual.

2) Install a heavy duty dynamic brake.
  3

If DS4 lights momentarily when the unit trips off, proceed as follows:

a) Examine STOP button and the associated wiring.

b) Monitor line voltage.

 a) Loose connection in STOP switch circuit.

b) Negative line voltage transient.

 a) Repair loose connection.

b) Correct line voltage condition.
D. Unit turns on but the motor will not turn. 1 Measure the line-line voltage across each motor lead. The voltage should be approximately 230V AC per phase with speed pot fully CW. Open motor leads or faulty motor. If voltage is zero, replace the logic assembly
E. The motor slows down or stops when loaded. 1 Visually check switch S4 and S5 settings (See Table 1, page 5). S4 and S5 are located on Logic Assembly 50281. Volts/Hz set too low Set switches to proper setting for desired Volts/Hz.
F. The motor will not turn until the speed pot is near full CW. 1 Visually check the setting of switch S1. (DC Boost) on the Logic Assembly 50281. Motor breakaway torque is too high for the amount of set DC boost. Set switch S1 to a higher number setting until the motor turns at a low speed pot positions.
G. The motor will not reach full speed when fully loaded. 1 Slowly turn R19 (accel. Limit) on Logic Assembly 50281 clockwise. Accel. current limit set too low. Slowly turn R19 until a motor reaches full speed at full load during accel.
H. Unit will not restart after cycling. 1 Allow unit to cool for 5 minutes; press STOP, then START push buttons. Unit should restart. Cycle rate too rapid for standard duty dynamic brake. Replace standard duty dynamic brake with heavy duty dynamic brake.

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