YASKAWA V1000 Series

5.5 Fault Detection
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07) 215
Troubleshooting
5
Cause Possible Solution
Motor has overheated.
• 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).
Motor has overheated.
• 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.
Motor has overheated.
• 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.
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 C1-08).
• The drive is 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).