YASKAWA GA700 Technical Manual page 293

Code Name
Note:
• Detected if the braking resistor overheat protective function was triggered.
• The magnitude of the braking load trips the braking resistor overheat alarm, NOT the surface temperature. Consequently, the alarm
will be tripped when the duty cycle exceeds the rating permits of the braking resistor.
• Perform Fault Reset to clear the fault.
• Fault detection is enabled by L8-01 [Internal DB Resistor Protect Sel].
Code Name
rr Dynamic Braking
Transistor
Note:
Perform Fault Reset to clear the fault.
Code Name
SC Out Short Circuit or IGBT
Fault
Note:
• Occurs if a short circuit or ground fault on the drive output side, or an IGBT failure, is detected.
• Perform Fault Reset to clear the fault.
Code Name
SCF Safety Circuit Fault
Note:
Perform Fault Reset to clear the fault.
Code Name
SEr Too Many Speed Search
Restarts
Note:
• Detected if the number of speed search restarts exceeds the value set in b3-19 [Number of Speed Search Restarts].
• Perform Fault Reset to clear the fault.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Cause
The braking load is too large.
The chosen braking resistor is not
appropriate.
Cause
The drive control circuit is damaged.
The internal braking transistor of the
drive has malfunctioned.
Cause
The motor is damaged from overheat or
the motor insulation is deteriorated.
The contact with a damaged motor main
circuit cable is creating a short circuit.
The output transistor of the drive has
been damaged due to a short circuit or
ground fault on the drive output side.
Cause
The safety circuit is broken.
Cause
The speed search-related parameter
settings are not appropriate.
The motor is coasting in the opposite
direction of the Run command.
Possible Solution
• Recalculate braking load and braking power, and
reduce the braking load.
• Improve braking power by checking the choice
of braking resistor.
Check the braking resistor specifications again, and
select a suitable braking resistor.
Possible Solution
• Restart the drive and check if the fault still
remains.
• Replace either the control board or the entire
drive if the fault continues. For instructions on
replacing the control board, contact Yaskawa or
your nearest sales representative.
Possible Solution
Measure the motor insulation resistance, and
replace the motor if there is electrical conduction or
worn insulation.
• Check whether the motor main circuit cable is
damaged, and remove any short circuits.
• Measure the resistance between the motor main
circuit cable and the ground terminal. If there is
electrical conduction, replace the cable.
• Make sure terminal B1 and terminals U/T1, V/
T2, and W/T3 are not shorted. Also make sure
terminal - and terminals U/T1, V/T2, and W/T3
are not shorted.
• If a short circuit has occurred, contact Yaskawa
or your nearest sales representative.
Possible Solution
Replace the board or the entire drive. For
instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
Possible Solution
• Lower the value set in b3-10 [Speed Estimation
Detection Gain].
• Increase the value set in b3-17 [Speed Est. Retry
Current Level].
• Increase the value set in b3-18 [Speed Est. Retry
Detection Time].
• Perform Auto-Tuning again.
Set b3-14 = 1 [Bi-Direction Speed Search Select =
Enabled].
6.4 Fault
6
293