GEH-6641E
—————— Function Description ——————
122
Ch.1
In a configuration with a multiple drive/motor, where a coordinated stop is usually required, the master Drive must
have, together with the Enable Mst and Enable Slv programming, an analog output set as PL next factor.
The PL next factor signal sets the ratio between the line speed and the present speed.
It must be connected to the Speed ratio. When the power loss is detected, the master speed decreases accord-
ing to the ratio calculated between
Speed ref and Motor speed.
Such ratio states the reference for the slave, in order to decrease the speed in a linear way according to the speed
of the master Drive. The motor functioning at a speed controlled by the master can be monitored on a digital
output of the master drive programmed as PL next active.
With a configuration for a multiple motor, such function can be performed only with the Drives connected on
common DC buses.
PI regulator
Speed ratio
calculator
To Analog input set
as "Speed ratio" of
Next Drive
PI regulator
Current Limit
Power Loss Stop
Current Limit
Power Ride Thru
DC link voltage
PLS I gain
23.28984 A/V/s
PLS P gain
0.349347 A/V
PLS Vdc ref
736,307 V
Norm Speed
Speed ref
PLS active
PL next active
PL next factor
DC link voltage
PLR I gain
15.6817 A/V/s
PLR P gain
0.235225 A/V
PL function sel
Off
PLS mains st src
NULL
Figure 1.11.2.1: Power Loss Control Function
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