6.3 Fault Detection
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
oLE
oL2
Drive Overload
The thermal sensor of the drive triggered overload protection.
C a u s e
P o s s ib le S o l u t i o n
Load is too heavy.
Reduce the load.
A ccel/decel ramp is too short.
Increase the settings for the acceleration and deceleration tim es (C1-01 through C1-08).
The output voltage is too high.
• Adjust the preset V /f pattern (E 1-04 through E 1-10) by reducing E1-08 and E1-10.
• D o not lower E1-08 and E1-10 excessively. This reduces load tolerance at low speeds.
Drive capacity is too small.
Replace the drive with a larger model.
Overload occurred when operating at low speeds.
• Reduce the load when operating at low speeds.
• Replace the drive with a m odel that is one frame size larger.
• Lower the carrier frequency (C6-03).
E xcessive torque compensation.
Reduce the torque compensation gain (C 4-01) until there is no speed loss but less current.
Output current fluctuation due to input phase loss
Check the power supply for phase loss.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
O L3
oL3
Overtorque Detection 1
The current has exceeded the value set for torque detection (L 6-02) for longer than the allowable tim e (L6-03).
C a u s e
P o s s ib le S o l u t i o n
Parameter settings are not appropriate for the load.
Check the settings o f parameters L6-02 and L6-03.
Fault on the m achine side (e.g ., machine is locked up).
Check the status o f the load. Rem ove the cause o f the fault.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
о 1 4
oL4
Overtorque Detection 2
The current has exceeded the value set for Overtorque Detection 2 (L 6-05) for longer than the allowable time (L6-06).
C a u s e
P o s s i b l e S o l u t i o n
Parameter settings are not appropriate for the load.
Check the settings o f parameters L6-05 and L6-06.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
oPr
oPr
External D igital Operator Connection Fault
• The external operator has been disconnected from the drive.
N o t e :
A n oPr fault w ill occur when all o f the follow ing conditions are true:
• Output is interrupted when the operator is disconnected (o2-06 = 1).
• The U p/Dow n command is assigned to the operator (b1-02 = 0 and LOCAL has been selected).
C a u s e
P o s s i b l e S o l u t i o n
External operator is not properly connected to the drive.
• Check the connection between the operator and the drive.
• Replace the cable i f damaged.
• Turn o ff the drive input power and disconnect the operator. Then reconnect the operator and turn the drive input power back on.
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
0 5
oS
Overspeed
The motor speed feedback exceeded the F1-08 setting.
C a u s e
P o s s i b l e S o l u t i o n
Overshoot is occurring.
• Reduce the settings for C5-01 (Speed Control Proportional Gain 1) and increase C5-02 (Speed Control Integral Time 1).
• If using a closed loop vector m ode, enable Inertia Compensation.
Inappropriate parameter settings.
Check the setting for the overspeed detection level and the overspeed detection tim e (F1-08 and F1-09).
D i g i t a l O p e r a t o r D i s p l a y
F a u l t N a m e
O U
ov
DC Bus Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
• For 200 V class: approximately 410 V
• For 400 V class: approximately 820 V
C a u s e
P o s s i b l e S o l u t i o n
Deceleration ramp is too short and regenerative energy
is flow ing from the motor into the drive.
• Increase the deceleration ramp (C1-02, C1-04, C1-06, C1-08).
• Make sure the braking resistor rating/external braking transistor rating fits the application.
• If an external braking transistor is used, make sure it is connected properly and working as expected.
Fast acceleration ramp causes the motor to overshoot the
speed reference.
• Check if sudden drive acceleration triggers an overvoltage alarm.
• Increase the acceleration ramp (C1-01, C1-03, C1-05, C1-07).
• Increase the jerk setting in C2-02 (decrease if o1-03 > 3)
Surge voltage entering from the drive input power.
Install a DC reactor.
N o t e :
Voltage surge can result from a thyristor convertor and phase advancing capacitor using the same input power supply.
Ground fault in the output circuit causes the D C bus
capacitor to overcharge.
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
Drive input power voltage is too high.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the specifications.
The braking transistor is wired incorrectly.
• Check braking transistor wiring for errors.
• Properly rewire the braking resistor device.
Encoder cable is disconnected.
Reconnect the cable.
Encoder cable wiring is wrong.
Correct the wiring.
N oise interference along the encoder wiring.
Separate the wiring from the source o f the noise (often the output lines from the drive).
Drive fails to operate properly due to noise interference.
• R eview the list o f possible solutions provided for controlling noise.
• R eview the section on handling noise interference and check the control circuit lines, main circuit lines, and ground wiring.
Motor hunting occurs.
• Adjust the parameters that control hunting.
• Adjust the AFR tim e constant (n2-02 and n2-03).
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YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
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