Yaskawa iQpump1000 AC Drive Quick Start - Manual (Page 253)

HOA Keypad 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.
HOA Keypad Display Fault Name
oL7
High Slip Braking oL
The output frequency stayed constant for longer than the time set to n3-04 during High Slip Braking.
Cause Possible Solution
Excessive load inertia
• Reduce deceleration times in parameters C1-02 and C1-04 for applications that do not use High Slip
Braking.
• Use a braking resistor to shorten deceleration time.
Motor is driven by the load
Something on the load side is restricting
deceleration
The overload time during High Slip
Braking is too short
• Increase parameter n3-04 (High-slip Braking Overload Time).
• Install a thermal relay and increase the setting of n3-04 to maximum value.
HOA Keypad Display Fault Name
oPr
External HOA Keypad Connection Fault
The HOA keypad 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 LOCAL has been selected).
Cause Possible Solution
HOA keypad 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.
HOA Keypad 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)
• For 600 V class drives: approximately 1040 V
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.
5.2 Fault Detection
YASKAWA TOEP YAIP1W 01B YASKAWA AC Drive - iQpump1000 Quick Start Guide 253
5
Troubleshooting