YASKAWA CIMR-VU BA0001 Technical Manual page 275

Digital Operator Display
Cause
Motor has overheated.
Digital Operator Display
Cause
Cycle times are too short during acceleration
and deceleration.
• Drive overloaded at low speeds.
• Overload may occur at low speeds when
using a general-purpose motor, even if
operating within the rated current
limitation.
Although a special type of motor is being used,
the motor protection selection is set for a
general-purpose motor (L1-01 = 1).
Voltage is too high for the V/f characteristics.
The wrong motor-rated current is set to E2-01.
The motor base frequency for the drive input
power is set too low.
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.
Speed Search related parameters are not set to
the proper values.
Output current fluctuation due to input phase
loss
Digital Operator Display
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
Motor Overheat Fault (PTC Input)
oH4
• The motor overheat signal to analog input terminal A1 or A2 exceeded the fault detection level.
• Detection requires multi-function analog input H3-02 or H3-10 be set to E.
• Check the size of the load, the accel/decel times and the cycle times.
• Decrease the load.
• Increase the acceleration and deceleration times (C1-01 through C1-08).
• Adjust the preset V/f pattern (E1-04 through E1-10). This will mainly involve reducing E1-08 and
E1-10. Be careful not to lower E1-08 and E1-10 excessively because this reduces load tolerance at low
speeds
• Check the motor-rated current.
• Enter the motor-rated current as indicated on the motor nameplate (E2-01).
• Ensure the motor cooling system is operating normally.
• Repair or replace the motor cooling system.
Motor Overload
oL1 The electrothermal sensor tripped overload protection.
Note: The U4-16 value must be less than 100 before oL1 can be reset.
Increase the acceleration and deceleration times (C1-01 through C1-08).
• Reduce the load.
• Increase the speed.
• If the drive is supposed to operate at low speeds, either increase the motor capacity or use a motor
specifically designed to operate with the drive.
Set L1-01 to 2.
• Adjust the user set V/f patterns (E1-04 through E1-10). Parameters E1-08 and E1-10 may need to be
reduced.
• If E1-08 and E1-10 are set too high, there may be very little load tolerance at low speed.
• Check the motor-rated current.
• Enter the value written on the motor nameplate to parameter E2-01.
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
Set L1-01 to 0 to disable the Motor Protection function and install a thermal relay to each motor.
• Check the motor characteristics.
• Correct the value set to L1-01 (Motor Protection Function).
• 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 losses and the motor temperature. If applied too long, motor damage
can occur. 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, enable Speed Estimation Type Search (b3-24 = "1").
Check the power supply for phase loss.
Drive Overload
oL2
The thermal sensor of the drive triggered overload protection.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
6.4 Fault Detection
6
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