YASKAWA V1000 Series Installation & Start-Up Manual page 197

The internal cooling fan has reached
its performance life or has
malfunctioned.
Current flowing to control circuit
terminal +V exceeded the tolerance
level.
LED Operator Display
oH3
Cause
Motor has overheated
LED Operator Display
oH4
Cause
Motor has overheated.
LED Operator Display
Cause
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual
• Check the maintenance time for the cooling fan (U4-04).
• If U4-04 exceeds 90%, replace the cooling fan.
Replacement on page
• After replacing fan, reset the fan maintenance time (o4-03 = "0").
• Check tCheck the current level of the terminal.
• Set the current to the control circuit terminal to be 20 mA or less.
Motor Overheat Alarm (PTC Input)
• The motor overheat signal to analog input terminal A1 or A2 exceeded the
alarm detection level.
• Detection requires multi-function analog input H3-02 or H3-10 be set 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). This will mainly involve
reducing E1-08 and E1-10.
• Be careful not to lower E1-08 and E1-10 excessively, as 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.
Motor Overheat Fault (PTC Input)
• The motor overheat signal to analog input terminal A1 or A2 exceeded the
alarm detection level.
• Detection requires that multi-function analog input H3-02 or H3-10 = "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). 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.
Motor Overload
oL1
The electrothermal sensor tripped overload protection.
5.4 Fault Detection
Refer to Cooling Fan
254.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
5
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