YASKAWA iQpump1000 User Manual page 280

5.3 Alarm Detection
HOA Keypad Display
oH5
<1>
Cause
Motor has overheated.
<1> Detected in models 4A0930 and 4A1200.
HOA Keypad Display
oL1
Cause
Load is too heavy
Cycle times are too short during
acceleration and deceleration
A general-purpose motor is driven below
the rated speed with a high load
The output voltage is too high
The wrong motor rated current is set to
E2-01
The base frequency is set incorrectly
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
280
Motor Overheat (NTC Input)
The motor temperature exceeded the level set to L1-16 (or L1-18 for motor 2)
• Reduce the load.
• Check the ambient temperature.
Motor Overload
The electronic motor overload protection tripped
Reduce the load.
Increase the acceleration and deceleration times (C1-01 through C1-04).
• Reduce the load.
• Increase the speed.
• If the motor is supposed to operate at low speeds, either increase the motor capacity or use a motor
specifically designed to operate in the desired speed range.
• Adjust the user-set V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not set E1-08 and E1-10 too low. This reduces load tolerance at low speeds.
• 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.
• Enter the rated frequency to E1-06 (Base Frequency).
• 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.
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solution
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual