YASKAWA V1000 Series Installation & Start-Up Manual page 199

Cycle times are too short during
acceleration and deceleration.
Voltage is too high for the V/f
characteristics.
Drive capacity is too small.
Overload occurred when operating
at low speeds.
Excessive torque compensation.
Speed Search related parameters are
not set correctly.
Output current fluctuation due to
input phase loss
LED Operator Display
Cause
Parameter settings are not
appropriate for the type of load.
There is a fault on the machine side
(e.g., the machine is locked up).
LED Operator Display
Cause
Parameter settings are not
appropriate for the type of load.
There is a fault on the machine side
(e.g., the machine is locked up).
LED Operator Display
Cause
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
Increase the settings for the acceleration and deceleration times (C1-01
through C1-08).
• Adjust the preset V/f pattern (E1-04 through E1-10). This will mainly involve
reducing E1-08 and E1-10.
• Be careful not to lower E1-08 and E1-10 excessively because this reduces
load tolerance at low speeds.
Replace the drive with a larger model.
• Reduce the load when operating at low speeds.
• Replace the drive with a model that is one frame size larger.
• Lower the carrier frequency (C6-02).
Reduce the torque compensation gain (C4-01) until there is no speed loss but
less current.
• Check the settings for all Speed Search related parameters.
• Adjust the current used during Speed Search and the Speed Search
deceleration time (b3-03 and b3-02 respectively).
• After Auto-Tuning the drive, enable the Speed Search Estimation Type
(b3-24 = "1").
Check the power supply for phase loss.
Overtorque Detection 1
oL3
The current has exceeded the value set for torque detection (L6-02) for longer
than the allowable time (L6-03).
Check the settings of parameters L6-02 and L6-03.
Check the status of the load.
Remove the cause of the fault.
Overtorque Detection 2
oL4
The current has exceeded the value set for Overtorque Detection 2 (L6-05) for
longer than the allowable time (L6-06).
Check the settings of parameters L6-05 and L6-06.
Check the status of the load.
Remove the cause of the fault.
High-Slip Braking OL
oL7
The output frequency stayed constant for longer than the time set in n3-04
during High-slip Braking.
5.4 Fault Detection
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
5
199