Cause Possible Solution
Surrounding temperature is too hot.
• 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.
Current flowing to control circuit
terminal +V exceeded the tolerance
level.
• Check the current level of the terminal.
• Set the current to the control circuit terminal to be 20 mA or less.
LED Operator Display Fault Name
oL1
Motor Overload
The electrothermal sensor tripped overload protection.
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).
• 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.
• 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.
Although a special type of motor is
being used, the motor protection
selection is set for a general-purpose
motor (L1-01 = 1).
Set L1-01 = “2”.
Voltage is too high for the V/f
characteristics.
• 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.
The wrong motor-rated current is set
to E2-01.
• Check the motor-rated current.
• Enter the value written on the motor nameplate to parameter E2-01.
The maximum frequency for the
drive input power is set too low.
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
Multiple motors are running off the
same drive.
Disable the Motor Protection function (L1-01 = “0”) and install a thermal relay to
each motor.
The electrical thermal protection
characteristics and motor overload
characteristics do not match.
• Check the motor characteristics.
• Correct the value set to L1-01 (Motor Protection Function).
• 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).
Overexcitation current is enabled.
• Overexcitation is a potential serious danger to the motor.
• Reduce the excitation deceleration gain (n3-13).
• Set L3-04 (Stall Prevention during Deceleration) to a value other than 4.
Output current fluctuation due to
input phase loss
Check the power supply for phase loss.
LED Operator Display Fault Name
oL2
Drive Overload
The thermal sensor of the drive triggered overload protection.
Cause Possible Solution
5.4 Fault Detection
130
YASKAWA ELECTRIC TOEP C710606 25B YASKAWA AC Drive J1000 Installation & Start-Up Manual
2/6/2008-14:44
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