Rockwell Automation SP120 ACDrive 115VAC, 1Ph, 230VAC, 1Ph/3Ph, 1/4-5.0HP - Manual (Page 55)

Troubleshooting the Drive 4-3
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4.3 Possible Drive Problems and Corrective Actions
Table 4.2 – Drive Problems
Problem Corrective Action
The motor does not start. 1. Check the power circuit
• Check the supply voltage
• Check all fuses and disconnects
2. Check the Motor
• Verify that the motor is connected properly
• Verify that no mechanical problems exist
3. Check the control input signals
• Verify that the start signal is present
• Verify that either the Run Forward or Run Reverse signal is active, but not
both
• Verify wiring of H, O, and L terminals if a remote speed pot is being used.
• If using 3 wire start, ensure that a 3 wire stop is programmed.
• Verify that the reset command {RS} is not active
4. Check the setting of A01 [ FREQUENCY COMMAND SELECT ]
5. Check setting of A02 [ START COMMAND SELECT ]
• If set to keypad start, check F04 [ START KEY DIRECTION ]; when set to 02, the
00 {FW} or 01 {RV} digital input must be active before pressing START.
The direction of motor
rotation is incorrect. 1. Check the motor output connections. Reverse two of the three phases if
necessary.
2. Check that the control inputs have been wired correctly.
3. If using 3-wire control, ensure that the 3-wire forward/reverse input is
programmed.
4. Check setting of F04 [ START KEY DIRECTION ]
The motor does not
accelerate properly. 1. Check to see that a frequency has been commanded.
2. Check to see if a preset frequency has been selected.
3. Check to see if the motor load is too high.
4. Check to see if the acceleration time is too long.
5. Check to see if manual boost and current limit are set properly.
The motor runs unstable. 1. If sudden high load changes occur, choose a drive and motor with higher
ratings or reduce the load changes.
2. If resonant frequencies occur in the motor, set up skip frequency bands.
3. If the input voltage is not constant, change the PWM carrier frequency.