YASKAWA V1000 Quick Start Manual page 91

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
Cause
Load is too heavy.
Cycle times are too short during
acceleration and deceleration.
Voltage is too high for the V/f
characteristics.
Drive capacity is too small.
Overload occurred when operating
at low speeds.
Excessive torque compensation.
Speed Search related parameters are
not set correctly.
YASKAWA ELECTRIC TOEP C710606 14A YASKAWA AC Drive - V1000 Quick Start Guide
• 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.
Increase the settings for 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.
Replace the drive with a larger model.
• Reduce the load when operating at low speeds.
• Replace the drive with a model that is one frame size larger.
• Lower the carrier frequency (C6-02).
Reduce the torque compensation gain (C4-01) until there is no speed loss but
less current.
• Check the settings for all Speed Search related parameters.
• Adjust the current used during Speed Search and the Speed Search
deceleration time (b3-03 and b3-02 respectively).
• After Auto-Tuning the drive, enable the Speed Search Estimation Type
(b3-24 = "1").
5.2 Fault Detection
Possible Solution
Possible Solution
5
91