YASKAWA U1000 Technical Manual page 378

6.4 Fault Detection
Digital Operator Display
Motor has overheated
Digital Operator Display
Cause
Motor has overheated
Digital Operator Display
Cause
Load is too heavy
Cycle times are too short during acceleration
and deceleration
A general-purpose motor is driven below the
rated speed with a high load
V/f characteristics (voltage and frequency) are
not suitable.
The wrong motor rated current is set to E2-01
The electrical thermal protection
characteristics and motor overload
characteristics do not match
The electrical thermal relay is operating at the
wrong level
Motor overheated by overexcitation operation
Parameters related to Speed Search are set
incorrectly
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• 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 preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not set E1-08 and E1-10 too low. This reduces load tolerance at low speeds.
• Check the motor rated current.
• Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate.
• Ensure the motor cooling system is operating normally.
• Repair or replace the motor cooling system.
Motor Overheat Fault (PTC Input)
oH4
• The motor overheat signal to analog input terminal A1, A2, or A3 exceeded the fault detection level.
• Detection requires setting multi-function analog inputs H3-02, H3-10, or H3-06 to E.
• 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 preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.
• Do not set E1-08 and E1-10 too low. This reduces load tolerance at low speeds.
• Check the motor rated current.
• Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate.
• Ensure the motor cooling system is operating normally.
• Repair or replace the motor cooling system.
Motor Overload
oL1
The electronic motor overload protection tripped
Reduce the load.
Note: Reset oL1 when the U4-16 value falls below 100.0%. U4-16 value must be less than 100.0%
before oL1 can be reset.
Increase the acceleration and deceleration times (C1-01 through C1-08).
• Reduce the load.
• Increase the speed.
• If the motor is supposed to operate at low speeds, either increase the motor capacity or use a motor
specifically designed to operate in the desired speed range.
Set V/f pattern setting parameters E1-04 through E1-10 to match the motor characteristics.
• Check the motor-rated current.
• Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate.
• Check the motor characteristics.
• Correct the type of motor protection that has been selected (L1-01).
• 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 increases the motor loss and the motor temperature. Excessive duration of
overexcitation may cause motor damage. 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.
• Check values set to Speed Search related parameters.
• Reduce the Speed Search Operation Current Level 1 (Current Detection Type 2, Current Detection
Type 3, Speed Estimation Type 2) (b3-31).
• After Auto-Tuning, set b3-24 to 1 to enable Speed Estimation Speed Search.
Fault Name
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual