Bernard Controls AT SWITCH RANGE, Startup Manual

Page: 17 / 24

English
17
Signal direction inversion
If the TAM transmitter is fitted on an
actuator which closes in the
counterclockwise direction, it provides a
signal that increases from the closed
position to the open position.
If an opposite signal variation is required,
simply move 2 jumpers
(1) on the board
near the potentiometer:
•
direct signal: jumpers on 1-3 and
2-4.
•
reversed signal: jumpers on 1-2 and 3-4.
How to calibrate TAM
You must always start by calibrating the 0/4 mA setting.
1. Connect a milliammeter with or without load to read the
output current.
2. Drive the actuator to the position corresponding to 0/4 mA.
As a standard, it is the position at the end of an operation in
the clockwise direction, which is the CLOSED position.
3. While holding the pinion located just under the plate marked
“ 0% position ” , adjust the potentiometer by turning its screw
so that you reach the range where the current is at its
minimal value.
4. Turn the screw backwards to find the range where the
current starts to regularly increase.
5. Turn again the screw backwards and stop as soon as the
minimum value determined at step 3 is reached.
The potentiometer is then positioned at the beginning of its
track.
6. Precisely adjust the 0/4 mA using the TAM screw marked
“0/4mA”.
7. Drive the actuator to the position corresponding to 20 mA.
As a standard, it is the position at the end of an operation in
the counterclockwise direction, which is the OPEN position.
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