YASKAWA GA700 Technical Manual page 290

6.4 Fault
Code Name
oL7 High Slip Braking oL
Note:
• Detected if the output frequency stayed constant for longer than n3-04 [High-Slip Braking Overload Time].
• Perform Fault Reset to clear the fault.
Code Name
oPr Keypad Connection Fault
Note:
• Detected if all of the following conditions are true:
–o2-06 = 1 [Ope Select @Keypad is Disconnect = Enabled] has been set.
–b1-02 = 0 [Run Command Selection 1 = Keypad] has been set, or operation in LOCAL is being executed using the keypad.
• Perform Fault Reset to clear the fault.
Code Name
oS Overspeed
Note:
• Detected if the motor speed remains above the value set in F1-08 [Overspeed Detection Level] for longer than F1-09 [Overspeed
Detection Delay Time].
• Perform Fault Reset to clear the fault.
• If detected, the drive will operate the motor according to the stop method set in F1-03 [Operation Select at Overspeed].
Code Name
ov Overvoltage
290
Cause
The load inertia is too big.
An external force on the load side
caused the motor to move.
Something is restricting deceleration on
the load side.
The value set in n3-04 is too small.
Cause
The keypad is not securely connected to
the connector on the drive.
The extension cable between the drive
and the keypad is disconnected.
Cause
Overshoot is occurring.
Incorrect number of PG pulses has been
set.
The oS detection level has not been set
appropriately.
Cause
Deceleration time is too short and
regenerative energy is flowing from the
motor into the drive.
The acceleration time is too short.
The braking load is too large.
Surge voltages are entered into input
power supply.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Possible Solution
• Reduce deceleration times in C1-02, C1-04, C1-
06, and C1-08 [Deceleration Time] for
applications that do not use High Slip Braking.
• Shorten the deceleration time using a braking
resistor.
• Increase the value set in n3-04.
• Connect a thermal overload relay to the motor,
and set n3-04 = 1200 s (maximum value).
Possible Solution
Check the connection between the keypad and the
drive.
Replace the cable if damaged.
Possible Solution
• Reduce C5-01 [ASR Proportional Gain 1] and
increase C5-02 [ASR Integral Time 1].
• Adjust the pulse train gain using the pulse train
input setting parameters H6-02 to H6-05.
Set H6-02 [Pulse Train Input Scaling] to the pulse
train frequency during 100% reference (maximum
motor rotation speed).
Adjust F1-08 and F1-09.
Possible Solution
• Set L3-04 = 1 [Decel Stall Prevention Selection
= General Purpose].
• Increase the value set in C1-02, C1-04, C1-06,
or C1-08 [Deceleration Time].
• Connect a dynamic braking option to the drive.
• Check if sudden drive acceleration triggers an
overvoltage fault.
• Increase the value set in C1-01, C1-03, C1-05,
or C1-07 [Acceleration Time].
• Increase the value set in C2-02 [S-Curve Time @
end of Accel].
• Set L3-11 = 1 [OV Suppression Function Select
= Enabled].
Connect a dynamic braking option to the drive.
Connect a DC reactor to the drive.
Note:
Within the same power supply system, turning
phase advancing capacitors on and off,
operating thyristor converters, and the like may
apply surge voltages and cause the input voltage
to rise abnormally.