YASKAWA V1000 Series Installation & Start-Up Manual page 198

5.4 Fault Detection
Load is too heavy.
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 maximum 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.
Cause
Overexcitation current is enabled.
Speed Search related parameters are
not set to the proper values.
Output current fluctuation due to
input phase loss
LED Operator Display
Cause
Load is too heavy.
198
Reduce the load.
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 = "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).
Disable the Motor Protection function (L1-01 = "0") 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 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.
• Disable overexcitation (n3-23 = "0").
• 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.
Reduce the load.
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
Possible Solution
Fault Name
Possible Solution