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User Guide Electrical Line Shaft for ADV200 Page 19 of 72
5.5 MECH RATIO Menu
The Electric Line Shaft application lets you follow a Master drive in phase with a relation expressed by the
following equation:
=
In which the overall relation is defined as:
=
1
1 +
100
where:
•
=
Els Act Mech Ratio
• : mechanical ratio between Master / Slave (with respect to fast shafts)
• : slip ratio between Slave / Master speeds;
• : slip/correction of
The Mech ratio is the ratio of rotations of the fast shafts (motor shafts) of the master to the slave to obtain the
same speed on the slow shafts. This value is derived from their respective kinematic chains. Once the
mechanical ratio (Mech ratio), is defined, Ratio0els will immediately indicate the ratio/slip between the
positions/speeds of the slow slave shafts with respect to the master.
Figure 6. Relation between ratios
The overall mechanical ratio is defined as follows:
=
The many types of kinematic chains can be grouped in two categories:
1. Gear mechanics
2. Non-gear mechanics
Drift can be prevented only with a type 1 kinematic chain because the mechanical ratio can be
expressed as a fraction; otherwise, drift can only be limited with external compensation systems.
E1
E1 RIP
Master
M
E
Gear
box
Motor shaft
Slow shaft
E1 E
1 RIP
Slave
M
E
E2
Gear
box
Motor shaft
Slow shaft
Master mechanical ratio
Slave mechanical ratio
Ratio Els
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