The acceleration or deceleration times are too
short.
Calculate the torque needed during acceleration relative to the load inertia and the specified acceleration
time.
If the right amount of torque cannot be set, make the following changes:
• Increase the acceleration time (C1-01, -03 )
• Increase the S-curve characteristics (C2-01 through C2-04)
• Increase the capacity of the drive.
The drive is attempting to operate a
specialized motor or a motor larger than the
maximum size allowed.
• Check the motor capacity.
• Ensure that the rated capacity of the drive is greater than or equal to the capacity rating found on the
motor nameplate.
Magnetic contactor (MC) on the output side
of the drive has turned on or off.
Set up the operation sequence so that the MC is not tripped while the drive is outputting current.
V/f setting is not operating as expected.
• Check the ratios between the voltage and frequency.
• Set parameter E1-04 through E1-10 appropriately.
• Lower the voltage if it is too high relative to the frequency.
Excessive torque compensation.
• Check the amount of torque compensation.
• Reduce the torque compensation gain (C4-01) until there is no speed loss and less current.
Drive fails to operate properly due to noise
interference.
• Review the possible solutions provided for handling noise interference.
• Review the section on handling noise interference and check the control circuit lines, main circuit
lines and ground wiring.
Overexcitation gain is set too high.
• Check if fault occurs simultaneously to overexcitation function operation.
• Consider motor flux saturation and reduce the value of n3-13 (Overexcitation Deceleration Gain).
Run command applied while motor was
coasting.
• Program the Speed Search command input through one of the multi-function contact input terminals
(H1-
= “61” or “62”).
The motor cable is too long
Use a larger drive.
LED Operator Display
Fault Name
oFA01
Option Unit Fault
Replace the option unit.
Cause
Possible Solution
The option unit is not properly connected to
the drive.
Turn the power off and reconnect the option unit.
LED Operator Display
Fault Name
oH1
Overheat 1 (Heatsink Overheat)
The temperature of the heatsink has exceeded the overheat detection level.
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.
Current flowing to control circuit teV
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).
6.4 Fault Detection
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6
Troubleshooting
