5.8 L: Protection Functions
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual 309
Figure 5.98
Figure 5.98 Loss of Reference Function
To have a digital output trigger when frequency reference loss occurs, set H2-01, H2-02, or H2-03 to C. Refer to Setting
C: Frequency reference loss on page 280 for details on setting the output function.
Parameter L4-05 selects the operation when a frequency reference loss is detected.
Setting 0: Stop
Drive follows the frequency reference (which is no longer present) and simply stops the motor.
Setting 1: Continue operation with reduced frequency reference
The drive will continue operation at the frequency reference value set in parameter L4-06. When the external frequency
reference value is restored, the operation is continued with the frequency reference.
■
L4-06: Frequency Reference at Reference Loss
Sets the frequency reference level the drive runs with when L4-05 = 1 and a reference loss was detected. The value is set
as a percentage of the frequency reference when the loss was detected.
■
L4-07: Speed Agree Detection Selection
Determines when frequency detection is active using parameters L4-01 through L4-04.
Setting 0: No detection during baseblock
Setting 1: Detection always enabled
◆ L5: Fault Restart
After a fault has occurred, this function attempts to automatically restart the motor and continue operation instead of
stopping.
The drive can be set up to perform a self-diagnostic check and resume the operation after a fault has occurred. If the
self-check is successful and the cause of the fault has disappeared, the drive restarts by first performing Speed Search.
Refer to b3: Speed Search on page 192 for details.
DANGER! Never use the fault restart function in hoist-type applications.
The drive can attempt to restart itself following the faults listed below.
Use parameters L5-01 to L5-05 to set up automatic fault restart.
No. Name Setting Range Default
L4-05 Frequency Reference Loss Detection Selection 0 or 1 0
No. Name Setting Range Default
L4-06 Frequency Reference at Reference Loss 0.0 to 100.0% 80.0%
No. Name Setting Range Default
L4-07 Speed Agree Detection Selection 0 or 1 0
Fault Name Fault Name
Aov Power Supply Overvoltage oL1 Motor Overload
GF Ground Fault oL3 Overtorque 1
LF Output Phase Loss oL4 Overtorque Detection 2
LSo LSo Fault ov Control Circuit Overvoltage
oC Overcurrent STo Pull-Out Detection
oH1 Overheat 1 (Heatsink Overheat)
–
–
100%
400 ms
Analog
frequency
reference
Loss of
Reference
output
time
10%
ON
OFF
SIEP_C710636_02B_1_0.book 309 ページ ２０１５年１１月２５日 水曜日 午後４時５６分
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