Other Faults

Motor not turning - A failure alarm is displayed: see above. Once the error has been corrected, enter the failure Reset command. If the keypad display is dark, it may indicate that the AC voltage supply to terminals U1/V1/W1 is missing or an internal fuse is faulty.

Check if the Enable and/or Start command is missing (refer to the configuration of the reg. terminals). If the drive is not accepting commands, ensure the correct operating mode is selected.

If a protective device ahead of the power supply has tripped, it may be incorrectly sized or the input jumper may be faulty. If the analog input used for the reference value was not assigned or assigned incorrectly, it may cause issues.

If the motor is turning in the wrong direction, check the polarity of the reference signal and the motor connection. CAUTION: if the motor rotation is reversed, the two encoder cables (A+ and A- or B+ and B-) have to be reversed also.

Motor not reaching nominal speed - The drive may be encountering a speed limit. Check the Speed max amount, Speed max pos, and Speed max neg parameters. If the drive is working at the current limit (LED limit), possible causes include the motor being overloaded, the inverter being sized too small, incorrect V/f characteristics set, or T current lim reduction selected via the Torque reduct parameter.

Check if the value for the number of encoder pulses is too high and set the correct value for the "encoder 1 pulses" parameter. If an override signal is reducing the main reference, check the configuration. Ensure the Speed base value parameter is set correctly.

Motor accelerates immediately to maximum speed - If the reference is set via an analog input, check whether the signal varies from min. to max. If a potentiometer is used for the reference, ensure there is a 0V (common) connection present.

If the encoder is not connected or incorrectly connected, select the Enc 1 speed parameter in the MONITOR \ Measurement \ Speed \ Speed in rpm menu and manually turn the motor clockwise (viewed from the front of the shaft) with the regulator disabled. The indicated value should be positive.

If the indicated value does not change or if random values are shown, check the power supply and cabling to the encoder. If the indicated value is negative, reverse the encoder connections by exchanging channel A+ and A- or B+ and B-.

Motor accelerates too slowly - The ramp value may be incorrectly set. If the motor is running at max. current, possible causes include the motor being overloaded, the drive being sized too small, or incorrect V/f characteristics set.

Motor decelerates too slowly - The ramp value may be incorrectly set.

Motor turns slowly, although the reference value is Zero - A minimum speed may be entered in the drive. If there is interference due to an unused analog input, set unused analog inputs to OFF.

Disconnect the reference on the analog input. If the drive now stands still, the effect may be due to the cable resistance of the 0V (common) leg. Use the offset compensation on the analog input and set the Offset input xx parameter so that the drive stands still.

Output voltage oscillates under load - The value for Rotor resistance may not be correct. Refer to the section "Checking and manual tuning of rotor resistance for field-oriented mode" in the AVi instruction book.

Motor not supplying the maximum torque or maximum output power - The value for Magnetizing curr may be less than required for the connected motor.

The ratio of Output voltage / Output frequency in the MONITOR / Measurements menu should be approximately equal to the ratio of Base voltage / Base frequency. If the drive is working at the current limit, check whether the value for Full load curr in the CONFIGURATION menu is correctly set and the current limit value.

If the value for Magnetizing curr and/or Rotor resistance parameters is not correct, optimize the tuning as described in the instruction book.

The speed during acceleration with maximum current is not linear - Reduce the Speed I and Speed P proportionally. If this does not lead to improvement, optimize the regulator per the instruction book.

Speed oscillating - Check the Speed P and Speed I parameters. If the operating point is in the constant HP range, check the Flux P and Flux I parameters. If the value for Rotor resistance is incorrect, optimize the tuning as described in the AVi instruction book.

Drive not reacting to adaptive speed regulation - Adaptive speed regulation may not be enabled. Enable spd adap = Enabled. Ensure the Adap reference is assigned to an analog input.

Motor potentiometer function not executed - The function may not be enabled. Enable motor pot = Enabled. If operating via the terminal strip, ensure Motor pot up and/or Motor pot down and Motor pot sign are assigned to digital inputs.

Jog operation not possible - A start command may still be present. The function may not be enabled. Enable jog = Enabled. If operating via the terminal strip, ensure Jog + and/or Jog - are assigned to digital inputs.

Internal speed reference values not actuated - The function may not be enabled. Enab multi spd = Enabled. If operating via the terminal strip, ensure Speed sel 0, Speed sel 1, and Speed sel 2 are assigned to digital inputs.

Multi-Ramp function not reacting - The function may not be enabled. Enab multi rmp = Enabled. If operating via the terminal strip, ensure Ramp sel 0 and Ramp sel 1 are assigned to digital inputs.

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