Tam" Position Transmitter (Option) - Bernard SD Serie Instructions De Mise En Service

8. "TAM" POSITION TRANSMITTER (OPTION)

The TAM transmitter delivers a 0/4 to 20 mA signal linearly proportional to the
angular position of the valve.
Electric connections
Refer to the wiring diagram supplied with the actuator. See also some typical
wiring examples below.
FIltered or stabilised power supply should be provided within the 12 to 32
VDC range.
Maximum admissible ohmic load values are given in the table :
Energy Supply
DC (VOLT)
Signal direction inversion
The TAM transmitter, when supplied with a standard actuator, provides a
signal that rise from close position to open position, the standard opening
direction being counter-clockwise.
If an opposite signal variation is required, simply move 2 jumpers on the
board near the potentiometer.
Direct signal : jumpers on 1-3 and 2-4
Reversed signal : jumpers on 1-2 and 3-4
Settings
Connect a milliampermeter at the place of burden.
- Always start by adjusting the 0/4mA.
- Drive actuator to the position corresponding to the 0/4 mA (closed in
standard),
- Hold the pinion located just under the plate with the "0% position" marking
while driving the potentiometer screw. Adjust the potentiometer so that the
output current reaches a minimum value. Turn backwards until the current
value regularly increases then turn backwards again and stop as soon as the
minimum value determined here above has been reached.
The potentiometer is then positioned at the very beginning of its track.
- Then, use the TAM adjustment screw marked as "0/4mA" to adjust the
current to a value as close to the 0/4 mA as possible.
- Drive actuator to the position corresponding to the 20 mA (open in
standard),
- Turn the screw marked "20mA" in order to read exactly 20 mA on the
milliampermeter.
- Come back to the closed position and check that, for the 0% position, the
signal current shows a close to 0/4 mA and repeatable value.
Max. admissible
load Ohm
12 150
24 750
30 1050
12