YASKAWA T1000V, Техническое руководство

Страница: 250 / 444

6.4 Fault Detection
250 YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
LED Operator Display Fault Name
oH4
Motor Overheat Fault (PTC Input)
• The motor overheat signal to analog input terminal A1 or A2 exceeded the fault detection level.
• Detection requires that multi-function analog input H3-02 or H3-10 = “E”.
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).
• Adjust the 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
• 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).
• 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).
Motor overheated by overexcitation
operation.
• Overexcitation increases the motor losses and the motor temperature. If applied too long, motor
damage can occur. Prevent excessive overexcitation operation or apply proper cooling to the motor
• Reduce the excitation deceleration gain (n3-13).
• Set L3-04 (Stall Prevention during Deceleration) to a value other than 4.
Speed Search related parameters are not set
to the proper values.
• 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”).
Output current fluctuation due to input
phase loss
Check the power supply for phase loss.