Restarting Operation After Transient Error (Auto Restart Function) - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

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.
• OC (Overcurrent)
• GF (Ground fault)
• PUF (DC bus fuse blown)
• OV (Main circuit overvoltage)
• UV1 (Main Circuit Undervoltage, Main Circuit MC Operation Failure)
* 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.
fault
occurance
fault
output
RUN
controller
retry
function
controller
base block
total base
block time
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controller
delay
5ms
L5-03 (max)
L2-03
Fig 6.33 Timing Chart for Auto Restart Function
Automatically Restart
• PF (Main circuit voltage fault)
• OL1 (Motor overload)
• OL2 (Inverter overload)
• OH1 (Motor overheat)
• OL3 (Overtorque)
*
45
6-