104 Chapter 7 - Parameters Description
User Manual
COAST THROUGH
Rated value
Vdc
Mains loss
Speed
Set speed
UV alarm
b
Internal
ctrl setpoit
UV threshold
Acceleration with
set ramp
Dig out
Coast
thru
DC link control
enabling
Mains restoring
a
b
a
Figure 7.6.11: Coast through
a)
the load energy exhausts before the mains is recovered
b)
the mains is recovered before the load exhausts its energy
At the mains power loss, the drive will lead the motor to zero speed, with a ramp internally defined and
depending by the load inertia (not the one set).
If used, the braking device will provide the advantage to achieve as more as possible the specified deceleration
fast stop time
(F.208 - Dec time 4
).
When reached the zero speed and exhausted the load energy, if the mains is not recovered, the DC link will
drop under the UV threshold.
Recovering the mains power, the motor will be led back to its original speed, with the defined acceleration
ramp.
The status of the "Coast Trough" function, is available on digital output, programmed as "
Coast Thru
".
