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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 parameter 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
restarting 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.
• OC (Overcurrent)
• GF (Ground fault)
• PUF (Fuse blown)
• OV (Main circuit overvoltage)
• UV1 (Main Circuit Undervoltage, Main Circuit MC Operation Failure)
• PF (Main circuit voltage fault)
• LF (Output phase failure)
* 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 H2-03 (multi-function contact output terminals M1-M2,
P1-PC, and P2-PC function selection) to 1E (auto restart).
Related Parameters
Name
Param-
eter
Display
Number
Number of
Sets the number of auto
auto restart
restart attempts.
attempts
Automatically restarts after a
L5-01
fault and conducts a speed
Num of
search from the run fre-
Restarts
quency.
Auto restart
Sets whether a fault contact
operation
output is activated during
selection
fault restart.
L5-02
0: Not output (Fault contact
is not activated.)
Restart Sel
1: Output (Fault contact is
activated.)
Setting
Description
Range
0 to 10
0 or 1
• RH (Braking resistor overheated)
• RR (Braking transistor error)
• OL1 (Motor overload)
• OL2 (Inverter overload)
• OH1 (Motor overheat)
*
• OL3 (Overtorque)
• OL4 (Overtorque)
Control Methods
Change
Factory
during
V/f
Open
Setting
Opera-
V/f
with
Loop
tion
PG
Vector
0
No
A
A
0
No
A
A
Continuing Operation
Regis-
Flux
ter
Vec-
tor
A
A
49EH
A
A
49FH
6-
77
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Troubleshooting
