6.4 Faults
354 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Code Name Causes Possible Solutions
oL3 Overtorque Detection 1 A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the
fault.
The parameters are incorrect for the
load.
Adjust L6-02 [Torque Detection Level 1] and L6-
03 [Torque Detection Time 1] settings.
Note:
• The drive detects this fault if the drive output current is more than the level set in L6-02 for longer than L6-03.
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the Stopping Method set in L6-01 [Torque Detection Selection 1].
• L5-07 [Fault Reset Enable Select Grp1] disables the Auto Restart function.
Code Name Causes Possible Solutions
oL4 Overtorque Detection 2 A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the
fault.
The parameters are incorrect for the
load.
Adjust L6-05 [Torque Detection Level 2] and L6-
06 [Torque Detection Time 2] settings.
Note:
• The drive detects this fault if the drive output current is more than the level set in L6-05 for longer than L6-06.
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the Stopping Method set in L6-04 [Torque Detection Selection 2].
• L5-07 [Fault Reset Enable Select Grp1] disables the Auto Restart function.
Code Name Causes Possible Solutions
oL5 Mechanical Weakening
Detection 1
The drive detected overtorque as
specified by the conditions for
mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect
Select].
Do a deterioration diagnostic test on the machine
side.
Note:
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the Stopping Method set in L6-08.
Code Name Causes Possible Solutions
oL7 High Slip Braking Overload The load inertia is too large.
An external force on the load side
rotated the motor.
Something is preventing deceleration on
the load side.
• Decrease deceleration times in C1-02, C1-04,
C1-06, and C1-08 [Deceleration Times] for
applications that do not use High Slip Braking.
• Use a braking resistor to decrease the
deceleration time.
The value set in n3-04 [HSB Overload
Time] is too small.
• Increase the value set in n3-04.
• Connect a thermal overload relay to the motor,
and set n3-04 = 1200 s (maximum value).
Note:
• The drive detects this fault if the output frequency is constant for longer than n3-04.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
oPr Keypad Connection Fault The keypad is not securely connected to
the connector on the drive.
Examine the connection between the keypad and
the drive.
The connection cable between the drive
and the keypad is disconnected.
• Remove the keypad and connect it again.
• If the cable is damaged, replace it.
Note:
• The drive detects this fault if these conditions are correct:
–o2-06 = 1 [Keypad Disconnect Detection = Enabled].
–b1-02 = 0 [Run Command Selection 1 = Keypad], or the drive is operating in LOCAL Mode with the keypad.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
oS Overspeed There is overshoot. • Decrease C5-01 [ASR Proportional Gain 1] and
increase C5-02 [ASR Integral Time 1].
• Adjust the pulse train gain with H6-02 to H6-05
[Pulse Train Input Setting Parameters].
There is an incorrect number of PG
pulses set in the drive.
Set H6-02 [Terminal RP Frequency Scaling] to the
pulse train frequency during 100% reference
(maximum motor rotation speed).
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