Automatically Restart
6-45
Restarting Operation After Transient Error (Auto Restart Function)
If an Inverter error occurs during operation, the Inverter will perform self-diagnosis. If no error is detected, the
Inverter will automatically restart. This is called the auto restart function.
The auto restart function can be applied to the following errors.
* When L2-01 is set to 1 or 2 (continue operation during momentary power loss)
If an error that is not listed above occurs, the protection function will operate and the auto restart function will
not work.
The number of auto restarts is set in parameter L5-01. If a fault occurs the inverter performs the auto restart
corresponding to Fig 6.33. The inverter tries to restart every 5 ms for the maximum time of L5-03. All retries
performed during L5-03 are regarded as one restart attempt.
The internal counting of restart attempts is reset to 0 when the drive has run 10 minutes without fault.
Fig 6.33 Timing Chart for Auto Restart Function
• OC (Overcurrent) • PF (Main circuit voltage fault)
• GF (Ground fault) • OL1 (Motor overload)
• PUF (DC bus fuse blown) • OL2 (Inverter overload)
• OV (Main circuit overvoltage) • OH1 (Motor overheat)
• UV1 (Main Circuit Undervoltage, Main Circuit MC Operation Failure)
*
• OL3 (Overtorque)
L2-03
L5-03 (max)
5ms
controller
delay
fault
occurance
fault
output
RUN
controller
retry
function
controller
base block
total base
block time
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