Load encoder to load
scaling
Motor to load
scaling
Motor encoder to
motor scaling
Load encoder
Motor
encoder
Load
90.53
90.54
90.61
90.62
90.43
90.44
X
Y
Y
Y
Y
X
X
X
e
e
M
1
Any gear ratio between the load encoder and the load is defined by 90.53 and 90.54.
Similarly, any gear ratio between the motor encoder and the motor is defined by 90.43
and 90.44. In case the internal estimated position is chosen as load feedback, the gear
ratio between the motor and load can be defined by 90.61 and 90.62. By default, all of
the ratios mentioned above are 1:1. The ratios can only be changed with the drive
stopped; new settings require validation by 91.10.
Position counter
The control program contains a position counter feature that can be used to indicate
the position of the load. The output of the counter function, parameter 90.7, indicates
the scaled number of revolutions read from the selected source (see section Load and
motor feedback).
The relation between revolutions of the motor shaft and the translatory movement of
the load (in any given unit of distance) is defined by parameters 90.63 and 90.64. This
gear function can be changed without the need of a parameter refresh or position counter
reinitialization – however, the counter output is only updated after new position input
data is received.
For detailed parameter connections of the load feedback function, see the block diagram
on page 628.
56 Program features
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