6
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Restarting Operation After Transient Fault (Auto Restart Function)
If an Inverter fault occurs during operation, the Inverter will perform self-diagnosis. If no fault is detected, the
Inverter will automatically restart. This is called the auto restart function.
Set the number of auto restarts in constant L5-01. A fault reset is attempted every 5 ms after a fault occurs and
minimum baseblock time has passed. The number of auto restarts is counted when the Inverter attempts a fault
reset and restarts operation. The protection function will operate if a fault continues to occur after auto restart-
ing the number of times set in L5-01.
The auto restart function can be applied to the following faults. If a fault not listed below occurs, the protec-
tion function will operate and the auto restart function will not.
* When L2-01 is set to 1 or 2 (continue operation during momentary power loss)
Auto Restart External Outputs
To output auto restart signals externally, set H2-01 to H2-05 (multi-function contact output terminals M1-M2,
P1-PC, P2-PC, P3-C3, and P4-C4 function selection) to 1E (auto restart).
Related Constants
Application Precautions
•
The number of auto restarts count is reset under the following conditions:
After auto restart, normal operation has continued for 10 minutes.
After the protection operation has been performed, and the fault has been verified, and an fault reset
has been input.
After the power supply is turned OFF, and then ON again.
•
Do not use the auto restart function with variable loads.
• OC (Overcurrent)
• RH (Braking resistor overheated)
• GF (Ground fault)
• RR (Braking transistor error)
• PUF (Fuse blown)
• OL1 (Motor overload)
• OV (Main circuit overvoltage)
• OL2 (Inverter overload)
• UV1 (Main Circuit Undervoltage, Main Circuit MC Operation Failure)
*
• OH1 (Motor overheat)
• PF (Main circuit voltage fault)
• OL3 (Overtorque)
• LF (Output phase failure)
• OL4 (Overtorque)
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vec-
tor
Open
Loop
Vector
2
L5-01
Number of
auto restart
attempts
Sets the number of auto restart
attempts.
Automatically restarts after a fault
and conducts a speed search from
the run frequency.
0 to 10
0
No
A
A
A
A
A
Num of
Restarts
L5-02
Auto restart
operation
selection
Sets whether a fault contact output
is activated during fault restart.
0: Not output (Fault contact is not
activated.)
1: Output (Fault contact is
activated.)
0 or 1
0
No
A
A
A
A
A
Restart Sel