YASKAWA P1000 Technical Manual page 200

6.4 Fault Detection
HOA Keypad Display
The wrong motor rated current is set to E2-01
The maximum output frequency is set incorrectly
Multiple motors are running off the same drive
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 input phase loss Check the power supply for phase 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 Check the power supply for phase loss.
HOA Keypad Display
oL3
Cause
Parameter settings are not appropriate for the load Check L6-02 and L6-03 settings.
Fault on the machine side (e.g., machine is locked
up)
HOA Keypad Display
oL7
Cause
200
• Check the motor-rated current.
• Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate.
• Check the rated frequency indicated on the motor nameplate.
• Set E1-03 to a V/f pattern matching the application.
Set L1-01 to 0 to disable the motor protection function and then install a thermal relay to each motor.
• 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).
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 and C1-02).
• Set E1-03 to a V/f pattern matching the application.
• 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 no speed loss but less current.
• 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.
Overtorque Detection 1
The current has exceeded the value set for torque detection (L6-02) for longer than the allowable time
(L6-03).
Check the status of the load. Remove the cause of the fault.
High Slip Braking oL
The output frequency stayed constant for longer than the time set to n3-04 during High Slip Braking.
YASKAWA SIEP YAIP1B 01B YASKAWA AC Drive – P1000 Bypass Technical Manual
Fault Name
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Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution