Troubleshooting and Maintenance
6-6
6
6.3 SOLUTIONS FOR THE MOST FREQUENT PROBLEMS
Problem
Point to be
Corrective Action
Verified
Motor does not start
Incorrect wiring connection
1. Check all power and control connections. For instance, the digital inputs
set to start/stop, general enable, or no external error shall be connected to
the 24 Vdc or to DGND* terminals (refer to figure 3.16).
Analog reference
1. Check if the external signal is properly connected.
(if used)
2. Check the status of the control potentiometer (if used).
Incorrect settings
1. Check if parameters are properly set for the application.
Fault
1. Check if the inverter is not blocked due to a fault condition.
2. Check if terminals XC1:13 and XC1:11 are not shorted (short-circuit
at the 24 Vdc power supply).
Motor stall
1. Decrease motor overload.
2. Increase P0136, P0137 (V/f), or P0169/P0170 (vector control).
Motor speed
Loose connection
1. Stop the inverter, turn off the power supply, and check and tighten
fluctuates (oscillates)
all power connections.
2. Check all internal connections of the inverter.
Defective reference
1. Replace potentiometer.
potentiometer
Oscillation of the external
1. Identify the cause of the oscillation. If it is caused by electrical noise, use shielded
analog reference
cables or separate from the power and control wiring.
Incorrect settings
1. Check parameters P0410, P0412, P0161, P0162, P0175, and P0176.
(vector control)
2. Refer to the Software Manual.
Motor speed
Incorrect settings
1. Check if the values of P0133 (minimum speed) and P0134
too high or too low
(reference limits)
(maximum speed) are properly set for the motor and application used.
Control signal from
1. Check the level of the reference control signal.
the analog reference
2. Check the settings (gain and offset) of parameters P0232 to P0249.
(if used)
Motor nameplate
1. Check if the motor has been properly sized for the application.
Motor does not reach
Settings
1. Decrease P0180.
the rated speed,
2. Check P0410.
or motor speed starts
oscillating around
the rated speed
(Vector Control)
Off display
Keypad connections
1. Check the inverter keypad connection.
Power supply voltage
1. Rated values shall be within the limits specified below:
200-230 V power supply: - Minimum: 187 V
- Maximum: 253 V
380-480 V power supply: - Minimum: 323 V
- Maximum: 528 V
Blown fuses
1. Replace fuses.
Table 6.2
- Solutions for the most frequent problems
