LED Display LCD Display Fault Name
The feedback signal has risen above the level
set in P1-11, High Feedback Level, for the
time set in P1-12, High Feedback Level Fault
Delay Time.
This is effective only when P1-13, High
Feedback Selection, is set to 0 (Fault and
digital out).
• Set the High Feedback fault characteristics in P1-11 and P1-12.
• Drive response to this condition is controlled by P1-13, High Feedback Selection. Auto-restart of this
fault is controlled by L5-41, High Feedback Fault Retry Selection.
LED Display LCD Display Fault Name
H1H20
HWL
High Water Level
The “High Water Level” digital input is active (H1-0o = 90).
Cause Possible Solution
The Low Water Level switch is activated or
P1-31, High Water Digital Input
Configuration, is programmed incorrectly.
Lower the water level and/or adjust the High Water Level switch.
LED Display LCD Display Fault Name
LF
LF
Output Phase Loss
• Phase loss on the output side of the drive.
• Setting L8-07 to 1 or 2 enables Phase Loss Detection.
Cause Possible Solution
The output cable is disconnected
• Check for wiring errors and properly connect the output cable.
• Correct the wiring.
The motor winding is damaged
• Check the resistance between motor lines.
• Replace the motor if the winding is damaged.
The output terminal is loose
• Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Gauges and
Tightening Torques on page 50 for details.
The rated current of the motor being used is
less than 5% of the drive rated current
Check the drive and motor capacities.
An output transistor is damaged If the problem continues, replace the drive.
A single-phase motor is being used The drive cannot operate a single phase motor.
LED Display LCD Display Fault Name
LF2
LF2
Output current imbalance
One or more of the phases in the output current is lost.
Cause Possible Solution
Phase loss has occurred on the output side of
the drive.
• Check for faulty wiring or poor connections on the output side of the drive.
• Correct the wiring.
Terminal wires on the output side of the drive
are loose.
Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Size and Torque
Specifications on page 57 for details.
No signal displays from the gate driver
board.
Replace the drive. Contact Yaskawa for assistance.
Motor impedance or motor phases are
uneven.
• Measure the line-to-line resistance for each motor phase. Ensure all values are the same.
• Replace the motor. Contact Yaskawa for assistance.
LED Display LCD Display Fault Name
LFB
LFB
Low Feedback
The feedback signal is too low.
Cause Possible Solution
The feedback signal has dropped below the
level set in P1-08, Low Feedback Level, for
the time set in P1-09, Low Feedback Level
Fault Delay Time.
This is effective only when P1-10, Low
Feedback Selection, is set to 0 (Fault and
digital out).
• Set the Low Feedback fault characteristics in P1-08 and P1-09.
• Drive response to this condition is controlled by P1-10, Low Feedback Selection.
• Auto-restart of this fault is controlled by L5-40, Low Feedback Fault Retry Selection.
6.3 Fault Detection
258
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual
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