Load is too heavy
• Measure the output current.
• Decrease the load.
• Lower the carrier frequency (C6-02).
Internal cooling fan is stopped
• Replace the cooling fan.
• After replacing the cooling fan, set parameter o4-03 to 0 to reset the cooling fan maintenance.
Digital Operator Display Fault Name
oH1
Overheat 1 (Heatsink Overheat)
The heatsink temperature exceeded the drive overheat level. Overheat level is determined by drive
capacity (o2-04).
Cause Possible Solution
Surrounding temperature is too high
• Check the temperature surrounding the drive.
• Improve the air circulation within the enclosure panel.
• Install a fan or air conditioner to cool the surrounding area.
• Remove anything near the drive that might be producing excessive heat.
Load is too heavy
• Measure the output current.
• Lower the carrier frequency (C6-02).
• Reduce the load.
Digital Operator Display Fault Name
<1>
oH5
Motor Overheat (NTC Input)
The motor temperature exceeded the level set to L1-16 (or L1-18 for motor 2)
Cause Possible Solution
Motor has overheated
• Reduce the load.
• Check the ambient temperature.
<1> Detected in models 4A0930 and 4A1200.
Digital Operator Display Fault Name
oL1
Motor Overload
The electronic motor overload protection tripped
Cause Possible Solution
Load is too heavy Reduce the load.
Cycle times are too short during acceleration
and deceleration
Increase the acceleration and deceleration times (C1-01 through C1-04).
A general-purpose motor is driven below the
rated speed with a high load
• 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.
The output voltage is too high
• 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.
The wrong motor rated current is set to E2-01
• Check the motor-rated current.
• Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate.
The base frequency is set incorrectly
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
The electrical thermal protection
characteristics and motor overload
characteristics do not match
• Check the motor characteristics.
• Correct the type of motor protection that has been selected (L1-01).
• Install an external thermal relay.
The electrical thermal relay is operating at the
wrong level
• Check the current rating listed on the motor nameplate.
• Check the value set for the motor rated current (E2-01).
Motor overheated by overexcitation operation
• 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.
5.2 Fault Detection
140
YASKAWA ELECTRIC TOEP YAIP1U 01B YASKAWA AC Drive - P1000 Quick Start Guide
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