YASKAWA iQpump1000 User Manual page 263

HOA Keypad Display
The electrical thermal protection
characteristics and motor overload
characteristics do not match
The electrical thermal relay is operating at
the wrong level
Motor overheated by overexcitation
operation
Parameters related to Speed Search are set
incorrectly
Output current fluctuation due to power
supply loss
HOA Keypad Display
oL2
Cause
Load is too heavy
Acceleration or deceleration time is too
short
The output voltage is too high
Drive capacity is too small
Overload occurred when operating at low
speeds
Excessive torque compensation
Parameters related to Speed Search are set
incorrectly
Output current fluctuation due to input
phase loss
HOA Keypad Display
oL3
Cause
Parameter settings are not appropriate for
the load
Fault on the machine side (e.g., machine is
locked up)
HOA Keypad Display
oL4
Cause
Parameter settings are not appropriate for
the load
HOA Keypad Display
oL7
Cause
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
• Check the motor characteristics.
• Correct the type of motor protection that has been selected (L1-01).
• Install an external thermal relay.
• Check the current rating listed on the motor nameplate.
• Check the value set for the motor rated current (E2-01).
• Overexcitation increases the motor loss and the motor temperature. Excessive duration of overexcitation
may cause motor damage. Prevent excessive overexcitation operation or apply proper cooling to the motor.
• Reduce the excitation deceleration gain (n3-13).
• Set L3-04 (Stall Prevention during Deceleration) to a value other than 4.
• Check values set to Speed Search related parameters.
• Adjust the Speed Search current and Speed Search deceleration times (b3-02 and b3-03 respectively).
• After Auto-Tuning, set b3-24 to 1 to enable Speed Estimation Speed Search.
Check the power supply for phase loss.
Drive Overload
The thermal sensor of the drive triggered overload protection.
Reduce the load.
Increase the settings for the acceleration and deceleration times (C1-01 through C1-04).
• Adjust the preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not lower E1-08 and E1-10 excessively. 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 in parameter C4-01 until there is less current but no speed loss.
• Check the settings for all Speed Search related parameters.
• Adjust the current used during Speed Search (b3-03) and the Speed Search deceleration time (b3-02).
• After Auto-Tuning, set b3-24 to 1 to enable Speed Estimation Speed Search.
Check the power supply for phase loss.
Overtorque Detection 1
The current has exceeded the value set for torque detection (L6-02) for longer than the allowable time (L6-03).
Check L6-02 and L6-03 settings.
Check the status of the load. Remove the cause of the fault.
Overtorque Detection 2
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.
High Slip Braking oL
The output frequency stayed constant for longer than the time set to n3-04 during High Slip Braking.
Fault Name
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
5.2 Fault Detection
5
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