Toshiba Tosvert VF-AS1 - Manual (Page 99)

E6581301
E-33
5
5.18.2 Regenerative power ride-through control/Deceleration stop during power failure/Synchronized acceleration/deceleration
WXE : Regenerative power ride-through control
H : Non-stop control time/Deceleration time during power failure
H : Synchronized deceleration time
H : Synchronized acceleration time
H : Regenerative power ride-through control level
[Parameter setting]
Title Function Adjustment range Default setting
WXE
Regenerative power ride-through
control selection
 :Disabled
 :Power ride-through
 : Deceleration stop during power failure:
 :Synchronized deceleration/acceleration
(synchronized acceleration/deceleration
signal)
 :Synchronized deceleration/acceleration
(synchronized acceleration/deceleration
signal+power failure)

H
Non-stop control time/Deceleration
time during power failure
 ~  sec. 
H Synchronized deceleration time  ~ sec. 
H Synchronized acceleration time  ~ sec. 
H Regenerative power ride-through control level  ~% 
Note 1: The power ride-through control time when WXE= depends on the setting of H, and the deceleration
time when WXE= depends on the setting of H.
Also, the deceleration time and the acceleration time when WXE= or  depend on the setting of H
and that of H, respectively.
Note 2: Even if these functions are used, a motor may free run according to load conditions.
In this case, use the auto-restart function along with this parameter function.
Note 3: These functions do not operate at the time of torque control or position control.
Note 4: Jog run function doesn't operate at synchronized acceleration/deceleration.
Note 5: Although the setting can be written into memory if WXE is set to  (power ride-through control), it cannot be
written if WXE is set to  (deceleration stop during a power failure).
■ An example of setting when WXE=
[When power is interrupted]
Motor speed
Several hundreds of milliseconds
to several tens of seconds.
Input voltage
Coasting time
Note: If power is interrupted
during deceleration stop,
power ride-through control
will not be performed.
[If momentary power failure occurs]
Motor speed
Input voltage
Non-stop control Normal acceleration
• Function
1) Regenerative power ride-through control: When momentary power failure occurs during operation, this
function makes operation continue using the regeneration
energy from a motor.
2) Deceleration stop during power failure: When momentary power failure occurs during operation, this
function stops the motor quickly compulsorily. A forcible stop is
carried out in H (Deceleration time) using the regeneration
energy from the motor.
(Deceleration time varies with control.)
After the forced stop, the inverter remains static until you put off
the operation command momentarily.
3) Synchronized acceleration/deceleration: When used with bobbin winders for textile machines, for
example, to prevent yarns from breaking in the event of a
momentary power failure or after the recovery from a power
failure, this function stops multiple machines simultaneously or
makes them reach their respective command frequencies
simultaneously by regulating their deceleration time or
acceleration time.
+ The time for which the operation of the motor
can be continued depends on the machine
inertia and load conditions. Before using this
function, therefore, perform verification tests.
+ Use with the retry function allows the motor to
be restarted automatically without being
brought to an abnormal stop.