12.8 L: PROTECTION
764 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
■ L4-06 Freq.Ref@RefLoss
No.
(Hex.)
Name Description
Default
(Range)
L4-06
(04C2)
Freq.Ref@RefLoss
Sets the frequency reference as a percentage to continue drive operation after it detects a
frequency reference loss. The value is a percentage of the frequency reference before the drive
detected the loss.
80.0%
(0.0 - 100.0%)
Set L4-05 = 2 [FrefLoss Det.Selection = Run@L4-06PrevRef] to enable this parameter.
■ L4-07 SpAgree Det.Selection
No.
(Hex.)
Name Description
Default
(Range)
L4-07
(0470)
SpAgree Det.Selection
Sets the condition that activates speed detection.
1
(1, 2)
1 : No Detect@BB
Detects the frequency while the drive is operating. When the drive turns off its output, it will not detect frequency.
2 : Always Detect
◆ L5: FAULT RESTART
The Auto Restart function tries to keep machines operating when the drive detects a transient fault.
The drive can do a self-diagnostic check and continue the operation after a fault has occurred. If the cause of the
fault goes away, the drive does speed search and restarts. It will not stop and the drive will not record a fault
history. Use L5-02 [Fault@Reset Select] to select the operation of fault relay signals during Auto Restart
operation.
Sets if the drive will do Auto Restart and the number of times the drive will try to do Auto Restart in a set time. If
the number of Auto Restart tries is more than the set value during the set time, drive output shuts off and operation
stops. If this happens, remove the cause of the fault and manually restart the drive.
DANGER! Sudden Movement Hazard. Failure to obey can cause death or serious injury. Do not use the fault restart function in
hoist or lifting applications.
The drive can do Auto Restart when these faults occur:
Note:
You can disable Auto Restart for faults if you must not restart the machine after the fault.
Table 12.54 List of Faults during which Auto Restart is Available
Fault Name
Parameters to Disable
Auto Restart
GF Ground Fault L5-08
LF Output Phase Loss -
oC Overcurrent -
oH1 Heatsink Overheat L5-08
oL1 Motor Overload L5-07
oL2 Drive Overload L5-07
oL3 Overtorque Detection 1 L5-07
oL4 Overtorque Detection 2 L5-07
Fault Name
Parameters to Disable
Auto Restart
ov Overvoltage L5-08
PF Input Phase Loss -
rH Braking Resistor Overheat -
rr Dynamic Braking
Transistor Fault
-
STPo Motor Step-Out Detected -
Uv1 DC Bus Undervoltage
*1
L5-08
*1 Uv1 is the target for the auto restart process when L2-01 = 1 [RideThru@PwrLoss = Enabled], and L2-50 = 0, 1, 2, 3
[RidThruMode@PwrLoss = Timer Controlled, While CPU Active, KEB Mode, KEB Stop Mode].
■ L5-01 Auto-Reset Attempts
No.
(Hex.)
Name Description
Default
(Range)
L5-01
(049E)
Auto-Reset Attempts
Sets the number of times that the drive will try to restart.
0
(0 - 10 times)
The drive resets the number of Auto Restart attempts to 0 in these conditions:
• The drive operates correctly for 10 minutes after a fault restart.
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