YASKAWA V1000 Quick Start Manual page 92

5.2 Fault Detection
Output current fluctuation due to
input phase loss
Cause
Deceleration time is too short and
regenerative energy flows from the
motor into the drive.
Acceleration time is too short.
Excessive braking load.
Surge voltage entering from the
drive input power.
Ground fault in the output circuit
causing the DC bus capacitor to
overcharge.
Improper Setting of Speed Search
related parameters.
(Includes Speed Search after a
momentary power loss and after a
fault restart.)
92
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).
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).
High-Slip Braking OL
oL7
The output frequency stayed constant for longer than the time set in n3-04
during High-slip Braking.
Digital Operator Connection Fault
• The LCD operator has been disconnected from the drive. Note: An oPr fault
will occur when all of the following conditions are true:
oPr
• Output is interrupted when the operator is disconnected (o2-06 = 1).
• The run command is assigned to the LCD operator (b1-02 = 0 and LOCAL
has been selected).
Overspeed (Simple V/f with PG)
oS
Pulse input (RP) indicates that motor speed feedback exceeded F1-08 setting.
Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
ov
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V (740 V when E1-01 is less than 400)
• Increase the deceleration time (C1-02, -04, -06, -08).
• Install a braking resistor or a dynamic braking resistor unit.
• Enable stall prevention during deceleration (L3-04 = "1"). Stall prevention is
enabled as the default setting.
• Check if sudden drive acceleration triggers an overvoltage alarm.
• Increase the acceleration time.
• Use longer S-curve acceleration and deceleration times.
The braking torque was too high, causing regenerative energy to charge the DC
bus. Reduce the braking torque, use a braking option, or lengthen decel time.
Install a DC reactor. Note: Voltage surge can result from thyristor convertor
and phase advancing capacitor using same drive main input power supply.
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
• Check the settings for Speed Search related parameters.
• Enable Speed Search Retry function (b3-19 greater than or equal to 1 to 10).
• Adjust the current level during Speed Search and the deceleration time (b3-02
and b3-03 respectively).
• Perform Line-to-Line Resistance Auto-Tuning and then enable Speed
Estimation Type Speed Search (b3-24 = "1").
YASKAWA ELECTRIC TOEP C710606 14A YASKAWA AC Drive - V1000 Quick Start Guide
Possible Solution