88
YASKAWA
TOEPC71061782C GA800 Drive Installation & Primary Operation
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.
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.
oL7
High Slip Braking Overload
The load inertia is too large.
•
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.
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.
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).
The
oS
detection level is set incorrectly.
Adjust
F1-08 [Overspeed Detection Level]
and
F1-09 [Overspeed
Detection Delay Time]
.
If the drive detects the fault at start or in the low
speed range (10% or less) and
n8-57 = 1 [HFI
Overlap Selection = Enabled]
for PM Control
methods, the high frequency injection gain is too
high.
•
Set
E5-xx [PM Motor Parameters]
correctly or do Rotational
Auto-Tuning.
•
Decrease the value of
n8-41 [HFI P Gain]
in 0.5 unit increments.
Note:
Set
n8-41 > 0.0
for IPM motors.
ov
Overvoltage
The deceleration time is too short and too much
regenerative energy is flowing back into the drive.
•
Set
L3-04 = 1 [Stall Prevention during Decel = General
Purpose]
.
•
Increase the values set in
C1-02, C1-04, C1-06, or C1-08
[Deceleration Times]
.
•
Connect a dynamic braking option to the drive.
•
Perform Deceleration Rate Tuning.
The acceleration time is too short.
•
Make sure that sudden drive acceleration does not cause the
fault.
•
Increase the values set in
C1-01, C1-03, C1-05, or C1-07
[Acceleration Times]
.
•
Increase the value set in
C2-02 [S-Curve Time @ End of Accel]
.
•
Set
L3-11 = 1 [Overvoltage Suppression Select = Enabled]
.
The braking load is too large.
Connect a dynamic braking option to the drive.
There are surge voltages in the input power supply.
Connect a DC link choke to the drive.
Note:
If you turn the phase advancing capacitors ON and OFF and use
thyristor converters in the same power supply system, there can
be surge voltages that irregularly increase the input voltage.
The drive output cable or motor is shorted to ground
(the current short to ground is charging the main
circuit capacitor of the drive through the power
supply).
1.
Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2.
Re-energize the drive.
The speed search-related parameters are set
incorrectly (this fault also occurs during recovery
from momentary power loss and after Auto Restarts).
•
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 set
b3-24 = 1 [Speed Search Method Selection = Speed Estimation]
.
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.
