Yaskawa Z1000U - Manual (Page 127)

n L4-06: Frequency Reference at Reference Loss
Sets the frequency reference level at which the drive runs when L4-05 = 1 and when detecting a reference loss. The value is
set as a percentage of the frequency reference before the loss was detected.
No. Name Setting Range Default
L4-06 Frequency Reference at Reference Loss 0.0 to 100.0% 80.0%
n L5-01: Number of Auto Restart Attempts
Sets the number of times that the drive may attempt to restart itself.
Parameter L5-05 determines the method of incrementing the restart counter. When the counter reaches the number set to L5-01,
the operation stops and the fault must be manually cleared and reset.
The restart counter is incremented at each restart attempt, regardless of whether the attempt was successful. When the counter
reaches the number set to L5-01, the operation stops and the fault must be manually cleared and reset.
The number of fault restarts is reset to zero when:
• The drive operates normally for 10 minutes following a fault restart.
• A fault is cleared manually after protective functions are triggered.
• The power supply is cycled.
No. Name Setting Range Default
L5-01 Number of Auto Restart Attempts 0 to 10 Times 0 Times
n L5-03: Time to Continue Making Fault Restarts (enabled only when L5-05 = 0)
Although the drive will continue to execute fault restarts, this parameter will cause a fault if a fault restart cannot occur after
the time set to L5-03 passes.
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 successful, the drive
performs a Speed Search (Regardless of the status of b3-01 "Speed Search Selection") from the set speed command and the
Auto Restart Attempts count is increased by one. Even if the restart fails, the restart count is increased by one as long as the
drive attempted to rotate the motor. The restart count will not be incremented if the restart is not attempted due to a continuing
fault condition, (i.e., an ov fault). The drive waits L5-03 seconds before attempting another restart.
No. Name Setting Range Default
L5-03 Time to Continue Making Fault Restarts 0.1 to 600.0 s 180.0 s
Run
Fault
Attempts
Voltage
remains high
for a long time,
then reset (1) Drive trips on oC,
resets (2) and tries
again but motor still
shorted, trips again. oC condition
gone, resets (3)
and runs.
Time
L2-03 L2-03 L2-03
L5-03
Count
ov
1 2 3
oC oC
trying each
L5-03 seconds successful successful
try but
failed
Figure 4.28 Automatic Restart Timing Diagram
The auto restart count is reset back to 0 if any of the following occur:
• No further faults for 10 minutes after the last retry.
• The drive power is turned off (the drive must be without power long enough to let control power dissipate).
4.7 Basic Drive Setup Adjustments
YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual 127
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Start-Up Programming & Operation