Yaskawa iQpump Micro - Manual (Page 175)

Digital Operator Display Fault Name
oL4
Overtorque Detection 2
The current has exceeded the value set for Overtorque Detection 2 (L6-05) for longer than the allowable
time (L6-06).
Cause Possible Solution
Parameter settings are not appropriate for
the load
Check the settings of parameters L6-05 and L6-06.
Digital Operator Display Fault Name
oL5
Mechanical Weakening Detection 1
Overtorque occurred, matching the conditions specified in L6-08.
Cause Possible Solution
Overtorque occurred, triggering the
mechanical weakening level set to L6-08. Check for the cause of mechanical weakening.
Digital Operator Display Fault Name
oPr
External Operator Connection Fault
The external operator has been disconnected from the drive.
Note: An oPr fault will occur when all of the following conditions are true:
• Output is interrupted when the keypad is disconnected (o2-06 = 1).
• The Run command is assigned to the operator (b1-02 = 0 and HAND has been selected).
Cause Possible Solution
External operator is not properly connected
to the drive
• Check the connection between the keypad and the drive.
• Replace the cable if damaged.
• Turn off the drive input power and disconnect the keypad. Reconnect the keypad and reapply drive input
power.
Digital Operator Display Fault Name
ov
Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
• For 200 V class drives: approximately 410 V
• For 400 V class drives: approximately 820 V (740 V when E1-01 is less than 400)
Cause Possible Solution
Deceleration time is too short and
regenerative energy is flowing from the
motor into the drive
• Increase the deceleration time (C1-02 and C1-04).
• Install a dynamic braking resistor or a dynamic braking resistor unit.
• Set L3-04 to 1 to enable stall prevention during deceleration. Stall Prevention is enabled as the default
setting.
Fast acceleration time causes the motor to
overshoot the speed reference
• Check if sudden drive acceleration triggers an overvoltage alarm.
• Increase the acceleration time.
• Use longer S-curve acceleration and deceleration times.
• Enable the Overvoltage Suppression function (L3-11 = 1).
• Lengthen the S-curve at acceleration end.
Excessive braking load
The braking torque was too high, causing regenerative energy to charge the DC bus. Reduce the braking
torque, use a dynamic braking option, or lengthen decel time.
Surge voltage entering from the drive input
power
Install a DC link choke.
Note: Voltage surge can result from a thyristor convertor and phase advancing capacitor using the
same input power supply.
Ground fault in the output circuit causes the
DC bus capacitor to overcharge
• Check the motor wiring for ground faults.
• Correct grounding shorts and reapply power.
Improper parameters related to Speed
Search (including Speed Search after a
momentary power loss and after a fault
restart)
• Check the settings for Speed Search-related parameters.
• Enable Speed Search restart 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 Stationary Auto-Tuning for line-to-line resistance and then set b3-14 to 1 to enable Speed
Estimation Speed Search.
Drive input power voltage is too high
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
5.2 Fault Detection
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual 175
5
Troubleshooting