YASKAWA J1000 Technical Manual page 138

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.
Output current fluctuation due to input phase
loss
LED Operator Display
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.
Output current fluctuation due to input phase
loss
LED Operator Display
Cause
Parameter settings are not appropriate for the
type of load.
There is a fault on the machine side (e.g., the
machine is locked up).
LED Operator Display
Cause
External operator is not properly connected to
the drive.
LED Operator Display
Cause
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
• 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 increases the motor losses and thereby 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.
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 C1-04).
• 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 power supply for phase loss.
Overtorque Detection 1
oL3
The current has exceeded the value set for torque detection (L6-02) for longer than the allowable time
(L6-03).
Check the settings of parameters L6-02 and L6-03.
Check the status of the load. Remove the cause of the fault.
External Digital Operator Connection Fault
The external operator has been disconnected from the drive.
Note: An oPr fault will occur when both of the following conditions are true:
oPr
• Output is interrupted when the operator is disconnected (o2-06 = 1)
• The run command is assigned to the operator (b1-02 = 0 and LOCAL has been selected)
• Check the connection between the operator and the drive
• Replace the cable if damaged
• Turn off the drive input power and disconnect the operator. Next reconnect the operator and turn the
drive input power back on.
Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
ov
• For 200 V class: approximately 410 V
• For 400 V class: approximately 820 V (740 V when E1-01 is less than 400)
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Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
6.4 Fault Detection
6
137