Lenze 931M-931W - Manual (Page 74)

Parameter setting
Conversion factors (factor group)
Overview
7

74 KHB 13.0003-EN 2.0
7.2 Conversion factors (factor group)
7.2.1 Overview
Controllers are used in various applications, e.g. as direct drives, with downstream
gearbox, for line drives, etc.
To make parameter setting for all these applications easy, the factor group can be used to
parameterise the controller in a way that allows the user to enter and read all values, such
as, for instance, the speed, directly in the required units on the drive.
The controller uses the factor group to convert the entries into its internal units. I.e. the
factor group is used to define the mathematical relation (gearbox ratio and polarity)
between the physical units and the internal controller units.
7.2.2 Description of the objects
Index Name Possible settings Characteristics
Lenze Selection Description
6091
h
Gear_ratio
0 number_of_
supported_entries
00
h
{1
h
} 02
h VAR
UINT8 RO —
Maximally supported
subindices.
02
h
Two subindices are
supported.
1 motor_revolutions 1 1 {1} 1000 VAR INT32 RW —
Gearbox ratio
2 shaft_revolutions 1 1 {1} 1000 VAR INT32 RW —
Gearbox ratio
607E
h
0 polarity 00
h
00
h
{04
h
} 40
h,
80
h,
C0
h VAR
UINT8 RW —
Setting the sign of the
position and velocity values.
The direction of rotation can
be inverted by changing the
sign.
Often, it is useful to set both
flags to the same value.
Bit 6 40
h
0 multiply by 1 position_polarity-flag
1 multiply by -1
Bit 7 80
h
0 multiply by 1 velocity_polarity-flag
1 multiply by -1

Note!
If both the direction of rotation of the position controller and the direction of
rotation of the lower-level speed controller are inverted with a position
control, the signal will not be inverted due to the double inversion (first in the
position, then in the speed controller).