Deceleration Takes Too Long With Dynamic Braking Enabled; Motor Hunting Occurs When Operating With A Light Load - YASKAWA V1000 Series Installation & Start-Up Manual

Deceleration Takes Too Long With Dynamic Braking Enabled

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Cause
L3-04 is set incorrectly.
The deceleration time is set too long.
Insufficient motor torque.
Reaching the torque limit.
Load exceeded the internal torque limit
determined by the drive rated current.

Motor Hunting Occurs When Operating With a Light Load

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Cause
Carrier frequency is too high.
Large V/f setting value at low speeds
triggers overexcitation.
The maximum output frequency and the
base frequency reference are not set
properly in relationship to each other.
Hunting Prevention is disabled (V/f
control only).
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
5.9 Troubleshooting without Fault Display
Possible Solutions
• Check the Stall Prevention Level during deceleration (L3-04).
• If a braking resistor option has been installed, disable Stall Prevention
during deceleration (L3-04 = "0").
Set deceleration to more appropriate time (C1-02, C1-04, C1-06, C1-08).
• Assuming parameter settings are normal and that no overvoltage occurs
when there is insufficient torque, it is likely that the demand on the motor
has exceeded the motor capacity.
• Use a larger motor.
• Check the settings for the torque limit (L7-01 through L7-04).
• If the torque limit is enabled, deceleration might take longer than
expected because the drive cannot output more torque than the limit
setting. Ensure the torque limit is set to a large enough value.
• Increase the torque limit setting.
• If multi-function analog input terminal A1 or A2 is set to torque limit
(H3-02 or H3-10 equals 10, 11, 12, or 15), ensure that the analog input
levels are set to the correct levels.
• Ensure H3-02 and H3-10 are set to the right levels.
• Ensure the analog input is set to the correct value.
Switch to a larger capacity drive.
Possible Solutions
Lower the carrier frequency setting C6-02.
• Select the proper V/f pattern (E1-03).
• Use parameters E1-04 through E1-10 to set the V/f pattern in relation to
the load characteristics.
Set the proper values for the maximum output frequency and base
frequency (E1-04, E1-06).
• Enable Hunting Prevention by setting n1-01 = "1".
• (OLV only) Increase the speed feedback detection control gain and time
constant (n2-01, n2-02).
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