5.10 Detailed Troubleshooting
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07) 255
Troubleshooting
5
■ Motor Hunting Occurs When Operating With a Light Load
Reaching the torque limit.
• 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.
Load has exceeded the internal torque
limit determined by the drive rated
current.
Switch to a larger capacity drive.
Cause Possible Solutions
Carrier frequency is too high. Lower the carrier frequency setting C6-02.
Large V/f setting value at low speeds
triggers overexcitation.
• 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.
The maximum output frequency and the
base frequency reference are not set
properly in relationship to each other.
Set the proper values for the maximum output frequency and base
frequency (E1-04, E1-06).
Hunting Prevention is disabled (V/f
control only).
• Enable Hunting Prevention by setting n1-01 = “1”.
• (OLV only) Increase the speed feedback detection control gain and time
constant (n2-01, n2-02).
Cause Possible Solutions
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