Bernard Controls Range EZ Serie Instructions De Mise En Service page 7

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
- Drive actuator to the position corresponding to the 20 mA (open position),
- 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 4 mA and repeatable value.
4.5 AUXILIAIRY CONTROL SWITCHES
The OPEN and CLOSED signalling can be managed separately by two separated control switches.
These switches are actuated by brown and grey cams.
They can be connected through terminals 20 to 25 as follow :
4.6 HEATING RESISTOR
Each actuator includes a heating resistor. As soon as the actuator is installed in the field, it is
recommanded du supply the resistor to prevent condensation.
4.7 CAUTION
Replace covers immediately after start-up and make sure that their seals are clean. Never fail
to replace the protection covers. If water ever enters, dry thoroughly before replacing covers.
Settings
Connect a milliampermeter at the place of burden.
- Always start by adjusting the 4mA.
- Drive actuator to the position corresponding to the 4 mA (closed
position),
- Hold the pinion located just under the plate with the «0% position»
marking while driving the potentiometer screw. Adjust the poten-
tiometer 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
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the current to a value as close to the 4 mA as possible.
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