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User Guide Electrical Line Shaft for ADV200 Page 21 of 72
5.6 ELS RATIO Menu
If set correctly, the mechanical ratio (Mech ratio), Els Ratio corresponds to ratio/slip between the
positions/speeds of the slow shafts.
You can set up to 4 electric line shaft ratios, selectable by parameter, digital inputs, or fieldbuses.
The control diagram of the electric line shaft ratio is shown in the chapter “CONTROL DIAGRAMS” Figure 27.
Els Ratio.
The set ratio is calculated as:
=
The sign of the ratio indicates the direction of movement compared to the direction of mechanical coupling set
for the slave.
For each of the 4 ratios, you can set an acceleration ramp and a deceleration ramp that will act when the ratio
changes. The ramps refer to the motor’s maximum speed parameter (corresponding to the time needed to
accelerate from 0
to the speed set in parameter Speed ref top lim IPA 670 on REFERENCES menu).
Assuming that the master is moving at a constant speed and that the slave is following it, if the new ratio is
higher than the current ratio, the new ratio will be reached with the corresponding acceleration ramp; on the
contrary, if the new ratio is lower than the current ratio, the new ratio will be reached with the corresponding
deceleration ramp.
The 0 value in ramp parameters implies immediate application of the new speed reference.
The slave is not in synchronism with its master during the time needed to reach the new ratio.
At the end of each ratio change phase (and at the end of the Engage phase), a dedicated monitor variable will
signal that the selected ratio is in use.
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