Yaskawa F7 Drive Programming Manual - Manual (Page 133)

Programming 125
L4-05 Frequency Reference Loss Detection Selection
L4-06 Frequency Reference at Loss of Frequency Reference
Setting Range: 0.0 to 100.0% of previous frequency reference
Factory Default: 80.0% of previous frequency reference
The Drive can be configured to compensate for the loss of its external frequency reference. An external frequency reference is
considered lost if it drops 90% of its value in 400mS or less.
Fig. 90 Loss of Frequency Reference Timing Diagram
To enable Frequency loss detection, set L4-05= “1: Enabled @ % of PrevRef”. If Frequency Reference Loss Detection is
enabled and the reference is lost, the Drive continues to operate at the frequency referenced by parameter L4-06. When the
frequency reference returns, the Drive again follows the frequency reference.
Setting H2-01/H2-02= “C: Loss of Ref”, configures a digital output as a Frequency Reference Loss indication only when
L4-05= “1: Enabled @ % of PrevRef”.
L5 Fault Restart
L5-01 Number of Auto Restart Attempts
Setting Range: 0 to 10
Factory Default: 0
L5-02 Auto Restart Operation Selection
All major faults will cause the Drive to stop. For some faults it is possible to configure the Drive to attempt a restart
automatically. After the fault occurs, the Drive baseblocks for L2-03 seconds. After the baseblock is removed the Drive checks
if a fault condition still exists. If no fault condition exists the Drive will attempt to restart the motor. If the restart is
Setting Description
0 Disabled
1 Enabled @ % of PrevRef (factory default)
Setting Description
0 No Fault Relay (factory default)
1 Fault Relay Active
t
Frequency
Reference
Output
Frequency t
10%
T
L4-06
100%
T = 400mS
100%
10%
TIME