BTR DG-Mini, Руководство пользователя

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BTR Controls, Inc.
PROGRAMMING
DG-Mini V7 Rev. C Standard HW manual V 1.0.2 42
Position sensor
The DG-Mini controller requires a position sensor to operate a door. The controller must know the resolution of the
connected position sensor. The resolution of the position sensor is the amount of movement/displacement the sensor is
able to measure. Typically a rotary encoder, a type of position sensor, is used with the controller. The resolution of a
rotary encoder is usually given as a ratio over one full revolution of the sensor such as 1.4°, 8-bit or 256 counts per
revolution (all the same resolution). The resolution and maximum number of revolutions for a selected rotary sensor are
supplied by the manufacturer.
A rotary encoder can be mounted in different locations on a door. The two most common locations are directly to the
motor shaft or on the drum shaft. This is important to note as the controller must be programmed to match the
expected rotary encoder’s resolution
in relation to the motor
including any reductions in resolution due to the mounting
location.
For example, if a rotary encoder with a resolution of 256 counts per revolution is mounted directly to a motor shaft, the
final resolution would be 256 counts per revolution as there are no resolution reductions. Conversely, if a rotary encoder
is mounted to a drum shaft driven by a gear motor with a ratio of 10:1, the final resolution would be (256 / 10 = 27) 27.
This equates to the rotary encoder reporting 27 counts (1/10 of a rotation) for every full revolution of the motor. This
final resolution number is programmed into the controller during installation. This value is critical. The position sensor
measures the door position and reports it to the controller. The controller then uses this value to operate the motor and
to determine door position. The controller is optimized when full door travel (open position - closed position) is greater
than 1000 counts but less than 10000 counts. The number of counts for full door travel, as described above, is
dependent on the resolution of the position sensor used and its mounting location. The controller uses an internal
position variable that has a maximum range of -32767 to +32767 counts. Therefore it may be necessary to scale the
position sensor reported position to satisfy the optimum travel and maximum count restrictions. Please seek assistance
from BTR Controls, Inc when determining an appropriate position sensor and its corresponding programming
requirements.
When using a BTR Absolute Encoder it is not necessary to manually program the individual position sensor parameters.
Using the Gear Ratio parameter, located in the System Config->Motor Config menu, the DG-Mini can automatically
configure itself. The Gear Ratio parameter is the number of motor revolutions needed for the BTR Absolute Encoder to
make one full revolution. This depends only on the mounting of the BTR Absolute Encoder
in relation to the motor . For
example, if the BTR Absolute Encoder is mounted directly to the motor shaft the Gear Ratio parameter would be set to
1. Conversely, if the BTR Absolute Encoder is mounted to a drum shaft driven by gear motor with a ratio of 10:1, the
gear ratio would be set to 10. No further program is required.
Position sensor
P
OSITION
S
ENSOR
M
ENU
E
NCODER
T
YPE
Description:
Type
2Ph Encoder Quadrature incremental encoder (reference switch required)
Limit Switch
Not supported in standard software.
BTR Encoder BTR absolute encoder.
AWG Encoder Not supported in standard software.
Dynaco Encoder Dynaco absolute encoder
GFA Encoder
GFA absolute encoder
Feig TST-PD Feig absolute encoder
Dall MAE Dall MAE absolute encoder
B102 B102 Albany absolute encoder