YASKAWA Z1000U Technical Manual page 157

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.
L5-03
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).
• The RESET key is pushed after the last reset attempt.
The setting of parameter L5-02 determines whether the fault output (MA-MB) will be closed during an auto restart attempt.
The setting of L5-02 can be important when using the drive with other equipment.
The following faults will allow the Auto Restart function to initiate:
• oC (Overcurrent)
• LF (Output Phase Loss)
• PF (Input Phase Loss)
• oL1 (Motor Overload)
• oL3 (Overtorque Detection 1)
• oL2 (Drive Overload)
• ov (Overvoltage)
• GF (Ground Fault)
• Uv1 (Undervoltage)
• oH1 (Heatsink Overheat)
In order for auto restart after a Uv1 fault, Momentary Power Loss Ride-thru must be enabled (L2-01= 1: "Power Loss Ridethru
Time"). Setting H2-01, H2-02 or H2-03 to 1E configures a digital output as "Restart Enabled" to signal if an impending auto
restart is possible.
n
L5-04: Fault Reset Interval Time
Determines the amount of time to wait between restart attempts when parameter L5-05 is set to 1.
No.
L5-04
YASKAWA SIEP YAIZ1D 01C Z1000U HVAC MATRIX Drive Bypass Technical Manual
Name
Time to Continue Making Fault Restarts
Run
ov
Fault
trying each
L5-03 seconds successful
Attempts L2-03
L5-01
Count
Voltage
remains high
for a long time,
then reset (1)
Figure 5.46 Automatic Restart Timing Diagram
Name
Fault Reset Interval Time
Setting Range
0.00 to 600.0 s
oC oC
try, but
failed successful
L2-03 L2-03
1 2 3
Time
Drive trips on oC, oC condition
resets (2) and tries gone, resets (3)
again but motor still and runs.
shorted, trips again.
Setting Range
5.8 L: Protection Functions
Default
180.0 s
Default
0.5 to 600.0 s
5
10.0 s
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