1330 TROUBLESHOOTING GUIDE SYMPTOM STEP DIAGNOSTIC PROCEDURE A. Unit does not turn on when the START push button switch is pressed. 1 Measure input line voltage between TB1-1 and TB1-2. Line voltage should be between 189 and 253V AC. 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. If 1 or more fuses are blown check the following before reapplying AC power: 3 a) Set ohmmeter on X1 scale. Check rectifier bridge CR1 as follows: Ohmmeter (+) REPAIR PROCEDURE Check and repair external line voltage source. 1 or more fuses (F1-F3) blown. Replace blown fuse or fuses. Perform Step A3 before reapplying power. a) A low ohmmeter reading. a) Replace CR1. b) A sustained low reading indicates C2 is shorted. b) Replace shorted capacitor. Reading (-) CR1(+) CR1-A CR1(+) CR1 -B CR1(+) CR1 -C CR1-A CR1(-) CR1-B CR1(-) CR1-C CR1(-) infinite infinite infinite infinite infinite infinite b) Remove leads from one side of capacitor C2. CONT. PROBABLE FAILURE OR INDICATION External line source voltage not present. 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. NOTE: Check F6 and F7 fuses on the control assembly 50282. 1330 TROUBLESHOOTING GUIDE SYMPTOM STEP 4 DIAGNOSTIC PROCEDURE Check for open fuses on the control assembly 50282. Check F4 Check F5 Check F6 Check F7 5 Measure AC voltage across connector J8-5 to J8-6 on the control assembly 50282. 6 Swing back hinged panel assembly. Confirm that DS1 on the control assembly 50282 is lit PROBABLE FAILURE OR INDICATION F4 blown--T1 faulty -faulty relay (1CR, 4CR, 5CR). 1 2 Replace blown fuse and faulty component. F5 blown--K1 shorted. F6 and/or F7--Refer to Step A3. If voltage is present, relay 1 CR may be faulty. If voltage is zero refer to previous Steps A2, A3, and A4. 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. B. Contactor K energizes momentarily then unit trips off. REPAIR PROCEDURE After the unit trips off, but before pressing the STOP push button, look at lights DS2, 3, and 5 on Logic Assembly 50281. Replace blown fuse, or faulty relay a) Replace 2CR relay. b) Replace logic assembly 50281 . Correct the high input line condition If DS2 is lit, check line voltage as in Step A1. If DS3 is lit, set the speed pot to zero, press STOP, wait a moment, then press START push button. Proceed as follows: DS2 lit: High bus voltage a) Observe that DS3 is lit. a) Defective Logic Assembly. a) Replace 50281 Logic Assembly. b) Observe that DS3 is not lit. b) The original cause for DS3 to be lit is probably external to the inverter and possibly due to overload, defective motor or wiring. b) Perform diagnostic procedure 2.C. c) Disconnect the motor from the inverter (drive). Confirm that DS3 does not light when the speed pot is turned up to 50% speed. c) Overload or defective motor or defective wiring. c) Repair/replace motor or remove overload. 1330 TROUBLESHOOTING GUIDE 1330 TROUBLESHOOTING GUIDE SYMPTOM STEP DIAGNOSTIC PROCEDURE 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. C. The unit trips off during normal operation. PROBABLE FAILURE OR INDICATION Shorted power transistor module(s) . REPAIR PROCEDURE 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. After the unit trips off, but before pressing the STOP push button, look at lights DS1, 2 and 4 on logic assembly. 1 If DS1 is lit, check input line voltage as in Step A1 2 If DS2 is lit, proceed as follows: 3 DS1 lit: Low line voltage or previous low line voltage transients. Check and correct line voltage condition . a) Measure the input line voltage. Line voltage should not be greater than 253V AC. a) Line voltage is marginally high. a) Check and correct line voltage condition. 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. b) If the unit trips off, the decel. rate is set too high for the motor/load inertia. b) Do one or both of the following: 1 ) Decrease the deceleration rate. 2) Install a heavy duty dynamic brake. If DS4 lights momentarily when the unit trips off, proceed as follows: a) Examine STOP button and the associated wiring. a) Loose connection in STOP switch circuit. a) Repair loose connection. b) Monitor line voltage. b) Negative line voltage transient. b) Correct line voltage condition . 1330 TROUBLESHOOTING GUIDE SYMPTOM STEP DIAGNOSTIC PROCEDURE Measure the line-line voltage across each motor lead. The voltage should be approximately 230V AC per phase with speed pot fully CW. Visually check switch S4 and S5 settings (See Table 1, following). S4 and S5 are located on Logic Assembly 50281 . Visually check the setting of switch S1. (DC Boost) on the Logic Assembly 50281 . PROBABLE FAILURE OR INDICATION Open motor leads or faulty motor REPAIR PROCEDURE If voltage is zero replace the logic assembly. Volts/Hz set too low. Set switches to proper setting for desired Volts/Hz. 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 low speed pot positions. Slowly turn R19 until motor reaches full speed at full load during accel. Replace standard duty dynamic brake with heavy duty dynamic brake. D Unit turns on but the motor will not turn. 1 E. The motor slows down or stops when loaded . 1 F. The motor will not turn until the speed pot is near full CW. 1 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. 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. 1330 TROUBLESHOOTING GUIDE TABLE 1 - SWITCH POSITION STATUS SWITCH S4 - 6 POSITION Volts/Hz 4.42 4.08 3.97 3.83 3.74 3.63 3.40 3.18 2.95 2.72 2.61 2.50 2.38 2.27 2.16 2.04 1.93 1.82 1.70 1.59 1.47 1.36 1.25 1.13 1.02 0.91 0.79 0.45 S4-1 X O X O X O O O O O X O X O X O X O X O X O X O X O X O S4-2 X O X X O O X O X O X X O O X X O O X X O O X X O O X O S4-3 X X O O O O X X O O X X X X O O O O X X X X O O O O X X S4-5 O O O O O O X X X X O O O O O O O O X X X X X X X X O O S4-5 O O O O O O X X X X X X X X X X X X O O O O O O O O O O S4-6 X X X X X X O O O O O O O O O O O O O O O O O O O O O O S5-1 O O X X O X X O O X O X O O X O X O O X O X X O X O X X SWITCH S5 - 4 OR 6 POSTION SEE NOTE ❶ S5-2 S5-3 S5-4 S5-5 X X X X O X X X X O X X X O X X X O X X O O X X X X O X X X O X O X O X X O O X X O O X O O O X O O O X O O O X X X X O X X X O O X X O O X X O O X X O X O X O X O X O O O X O O O X O O O X O X X O O X X O O O X O O X O O O S5-6 O O O O O O O O O O O O O O O O O O O O O O O O O O O O