YASKAWA V1000 Series Installation & Start-Up Manual page 255

Cause
Reaching the torque limit.
Load has exceeded the internal torque
limit determined by the drive rated
current.
Motor Hunting Occurs When Operating With a Light Load
■
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 TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
5.10 Detailed Troubleshooting
Possible Solutions
• 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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