Toshiba Tosvert VF-A5 - Manual (Page 85)

LJ r
P
(Protection Parameters)
I I
U U
^ f
LJ LJ L-
Regeneration power ride-through
control
Related parameters
U u C I Regeneration power ride-through control L J u j E t I Ride-through time
This function allows operation to continue using regenerated energy from the motor when a momentary power
failure occurs.
Continuation may not be possible depending on the machine’s inertia or load state, so when selecting this
function, always perform a confirmation test. If an overvoltage trip (0 P) occurs when this function is operating
or continuation Is not possible for long periods of time, lengthen the acceleration/deceleration times. Automatic
restarting is possible without fault stopping when this function is used with the retry function.
U u C setting value Function
D
1
Regeneration power ride-through control OFF
Regeneration power ride-through control ON
* The ride-through time U u C t can be set between 0.0 and 25.0 seconds.
Since this function can keep only the inverter operational during an extended momentary power failure, the
applicability will depend on the remainder of the load system equipment.
Note that when using the standard control power connections, the inverter will be able to maintain control
power and operate for only approx. 100msec during a momentary power failure. However, for 30kW and
smaller units, control power can be maintained for a longer period of time by using the main circuit DC
terminals PA and PC as shown below.
PA PC RO so
—©
Remove the shorting bars between R0-R/L1
and S0-S/L2, or the inverter may be damaged.
Never use the above wiring for 37kW or larger
units, as the inverter may be damaged.
F I r 5 t :
Auto-restart
* Set the auto-restart parameter R r 5 b to use auto-restart,
R r - 5 b setting value Function
D OFF
/ On momentary power failure
E On ST make/break
3
Both / and S
R r - 5 t I set to / ... Activates when power is restored after a main circuit and control power circuit
undervoltage is detected.
I R r R h I set to p . . . Activates when ST-CC is opened and then closed again. (For commercial/inverter
power switching)
* Depending upon the inverter capacity, a wait time of 200ms to 1500ms is automatically set when restarting
after a gate block or CPU reset to reduce the motor’s residual voltage.
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