YASKAWA GA700 Series

7.4 Fault
344 YASKAWA SIEPC71061705H GA700 Series Technical Manual
Code Name Causes Possible Solutions
If the drive detects ov in these conditions, the speed
search-related parameters are incorrect:
• During speed search
• During momentary power loss recovery
• When the drive starts again automatically
• When you use an IE3 premium efficiency motor
• Examine the settings for all speed search related parameters.
• Set b3-19 ≠ 0 [Speed Search Restart Attempts ≠ 0 times].
• Adjust b3-03 [Speed Search Deceleration Time].
• Do Stationary Auto-Tuning for Line-to-Line Resistance and
then set b3-24 = 1 [Speed Search Method Selection = Speed
Estimation].
• Use these values to adjust the parameters.
• b3-03 [Speed Search Deceleration Time] = default value ×
2
• L2-03 [Minimum Baseblock Time] = default value × 2
• L2-04 [Powerloss V/f Recovery Ramp Time] = default value
× 2
The power supply voltage is too high. Decrease the power supply voltage to match the drive rated
voltage.
The braking resistor or braking resistor unit wiring
is incorrect.
Correct wiring errors in the connection to the braking resistor or
braking resistor unit.
The encoder cable is disconnected or wired
incorrectly.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Noise interference along the encoder cable. Isolate the encoder cable from the drive output line or a different
source of electrical interference.
Electrical interference caused a drive malfunction. • Examine the control circuit lines, main circuit lines, and
ground wiring, and decrease the effects of electrical
interference.
• Make sure that a magnetic contactor is not the source of the
electrical interference, then use a Surge Protective Device if
necessary.
The load inertia is set incorrectly. • Examine the load inertia settings with KEB, overvoltage
suppression, or stall prevention during deceleration.
• Adjust L3-25 [Load Inertia Ratio] to match the qualities of the
machine.
You used the Short Circuit Braking function when
A1-02 = 5 [Control Method Selection = OLV/PM].
Connect a braking resistor to the drive.
There is motor hunting. • Adjust n1-02 [Hunting Prevention Gain Setting].
• Adjust n2-02 [Automatic Freq Regulator Time 1] and n2-03
[Automatic Freq Regulator Time 2].
• Adjust n8-45 [Speed Feedback Detection Gain] and n8-47
[Pull-in Current Comp Filter Time].
Speed Search at Start does not complete correctly
when:
• A1-02 = 8 [Control Method Selection = EZOLV]
• E9-01 = 0 [Motor Type Selection = Induction
(IM)]
Set b3-24 = 2 [Speed Search Method Selection = Current
Detection 2].
The drive detects ov [Overvoltage] when A1-02 = 2
[OLV] and when:
• The acceleration completes
• The deceleration starts
• The load changes suddenly
• Increase the value set in n2-03 [Automatic Freq Regulator
Time 2] in 50 ms increments.
Note:
Make sure that this parameter setting is: n2-02 [Automatic
Freq Regulator Time 1] ≤ n2-03. When you adjust n2-03, you
must also increase the C4-06 [Motor 2 Torque Comp Delay
Time] value by the same ratio.
• Increase C4-06 in 10 ms increments.
Note:
Make sure that this parameter setting is: C4-02 [Torque
Compensation Delay Time] ≤ C4-06. When you adjust C4-06,
you must also increase the n2-03 [Automatic Freq Regulator
Time 2] value by the same ratio.
Note:
• The drive detects this error if the DC bus voltage is more than the ov detection level while the drive is running.
• Do a Fault Reset to clear the fault.
• For 200 V class drives, the detection level of ov is approximately 410 V. For 400 V class drives, the detection level is approximately 820 V.
• L5-08 [Fault Reset Enable Select Grp2] disables the Auto Restart function.
Code Name Causes Possible Solutions
PE1 PLC Fault 1
The communication option detected a fault. Refer to the manual for the communication option card.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
PE2 PLC Fault 2
The communication option detected a fault. Refer to the manual for the communication option card.
Note:
Do a Fault Reset to clear the fault.