YASKAWA T1000V Technical Manual page 251

LED Operator Display
Cause
Load is too heavy.
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.
LED Operator Display
Cause
External operator is not properly connected
to the drive.
LED Operator Display
Cause
Overshoot or undershoot is occurring.
Incorrect PG pulse settings.
Inappropriate parameter settings.
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Drive Overload
oL2
The thermal sensor of the drive triggered overload protection.
Reduce the load.
Increase the settings for the acceleration and deceleration times (C1-01 through C1-08).
• Adjust the 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.
External Digital Operator Connection Fault
• The external operator has been disconnected from the drive.
oPr
Note: An oPr fault will occur when all of the following conditions are true:
• Output is interrupted when the operator is disconnected (o2-06 = 1).
• The run command is assigned to the operator (b1-02 = 0 and LOCAL has been selected).
• Check the connection between the operator and the drive.
• Replace the cable if damaged.
• Turn off the drive input power and disconnect the operator. Next reconnect the operator and turn
the drive input power back on.
Overspeed (Simple V/f with PG)
oS
Pulse input (RP) indicates that motor speed feedback exceeded F1-08 setting.
• Adjust the gain by using the pulse train input parameters (H6-02 through H6-05).
• Increase the settings for C5-01 (Speed Control Proportional Gain 1) and reduce C5-02 (Speed
Control Integral Time 1).
Set the H6-02 (Pulse Train Input Scaling) = 100%, the number of pulses during maximum motor
revolutions.
Check the setting for the overspeed detection level and the overspeed detection time (F1-08 and F1-
09).
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
6.4 Fault Detection
6
251