YASKAWA Z1000U Technical Manual page 216

6.4 Fault Detection
HOA Keypad Display
Motor has overheated
HOA Keypad Display
oH4
Cause
Motor has overheated
HOA Keypad Display
oL1
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
The output voltage is too high
The wrong motor rated current is set to E2-01
The base frequency is set incorrectly
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
216
• 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 and C1-02).
• 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)
• The motor overheat signal to analog input terminal A1 or A2 exceeded the fault detection level.
• Detection requires setting multi-function analog inputs H3-02 or H3-10 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 and C1-02).
• 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
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 and C1-02).
• 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.
• Adjust the user-set 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.
• Check the rated frequency indicated on the motor nameplate.
• Enter the rated frequency to E1-06 (Base Frequency).
• 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.
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
Fault Name
Fault Name
Possible Solution
Fault Name
Possible Solution