Delta RMC151 - Manual (Page 912)

RMC70/150 and RMCTools User Manual
9.2.2.2.6. Acceleration Scale
Type: Axis Parameter Register
RMC70 Address: %MDn.18, where n = 12 + the axis number
RMC150 Address: %MDn.18, where n = 24 + the axis number
System Tag: _Axis[n].AccScale, where n is the axis number
How to Find: Axes Parameters Pane, Setup tab: Primary Control Setup
Data Type: REAL
Units: (pu/s 2 )/V or (pu/s 2 )/mA
Range: any
Default Value: 1
Description
This parameter is used together with the Acceleration Offset parameter to convert the
Voltage or Current of a single-input acceleration to an Actual Acceleration. The
Acceleration Scale specifies how many position units equal one transducer voltage or
current unit.
The Acceleration Scale and Acceleration Offset parameters apply only to acceleration
inputs. They are not used to calculate the derived Actual Acceleration on position or
velocity inputs.
To reverse the direction of the feedback, use a negative Acceleration Scale.
Changing this Parameter
Because this parameter affects motion, the axis must be disabled or in Direct Output
before writing to this parameter. The Enabled and Direct Output Status Bits indicate these
states of the axis. When changing this parameter from RMCTools, the software will
automatically do this for you. This may cause a halt on the axis, which is expected.
Setting the Acceleration Scale
In general, to set the scale, determine how many voltage or current units correspond to
one acceleration unit (inches/sec 2 , meters/sec 2 , etc., as desired). The Acceleration Scale
is the inverse of that number.
See the Analog Acceleration Scaling topic for more details.
Why bother?
It is important to specify the measurement units to be used for each axes. Setting the
Scale converts the information from the transducer into meaningful measurement units.
9.2.2.2.7. Acceleration Offset
Type: Axis Parameter Register
RMC70 Address: %MDn.19, where n = 12 + the axis number
RMC150 Address: %MDn.19, where n = 24 + the axis number
System Tag: _Axis[n].AccOffset, where n is the axis number
How to Find: Axes Parameters Pane, Setup tab: Primary Control Setup
Data Type: REAL
Units: V or mA
Range: any
892 Delta Computer Systems, Inc.