Setting Of Mechanical Stops And Travel Limit Switches - Bernard Controls EZ Serie Inbetriebnahmeanleitung

5.3 MinigaM+ configuration
Different operating parameters are adjustable thanks to switches located on the circuit board.
Switches 5, 6 and 7 located on the circuit board are always on position A.
Selection of input-output signals
Switches 1, 2, 3 and 4 allow to set the types of input-output signals.
Switches position
Input Output
Signal Signal
1 2 3
0 to 10V 0 to 10V B B B
2 to 10V 2 to 10V B B B
4 to 20mA 4 to 20mA A A A
0 to 20mA 0 to 20mA A A A

setting of MechanicaL stops anD traveL LiMit switches

5.4
To adjust the limit switches, it's possible to remove the potentiometre
board. In this case, It's necessary to do a full adjustment of the output
signal.
Mechanical stops description and function :
These items avoid any over-travelling during handwheel operations.
The stops can be positioned either on the actuator itself or on the 1/4 Turn
worm gearbox if any.
Actuators and gears are supplied and tested for a 90° operation.
Fine adjustment of the stop screws position is possible within a limit
of ± 2° maximum
Travel limit switches description and function:
The cams operating the limit switches are on a cylindrical block which does not require any disas-
sembly. Each cam can be set independently of the others. The white and black cams are for OPEN
and CLOSE travel limit switches. The other cams actuate additional limit switches (Example : For
signalling).
How to operate the cams:
a) Put a screwdriver in the slot of the button encircled by the same color as the cam to be set,
b) Press lightly to disengage the cam of locked position,
c) By turning the screwdriver rotate the cam to the position in which it can trip the limit switch,
d) Remove screwdriver and ensure that the button has come back to its original position, thus
locking the cam in chosen place.
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Input signal specification
4
Input
Signal
B impedance
A
0-20mA 260ohm
4-20mA 260ohm
A
0-10V 10kohm
B
Procedure of mechanical stops and travel limit switches setting:
a) Loosen stop screws by 2 turns.
b) Manually drive the valve to the closed position. If mechanical stops
are reached before the valve closing is completed, it means that the
2° maximum adjustment tolerance has been exceeded ; do not try
to go beyond this limit.
c) Set the cam of the «CLOSED» travel limit switch.
d) Turn stop screws clockwise to the mechanical contact, reloosen 1.5
turn, and secure by lock nut..
Proceed in the same way in OPEN position.
Perform complete electrical valve opening and closing operations
it is mandatory that the motor stops on the travel limit switch
and not on the mechanical stop.
5.5 setting of reMote position signaL
5.5.1 setting of cLoseD position (0%)
Drive the actuator carefully to the closed position.
Connect a milliamperemeter or a millivoltmeter on terminals 71, 72.
With a screwdriver, adjust the potentiometer until reading 4mA (4-
20mA signal), 0mA (0-20mA signal) or 0V (0-10V signal).
Start an actuator opening and check that the signal current/voltage
increases.
5.5.2 setting of open position (100%)
Drive the actuator carefully to the open position.
Connect a milliamperemeter or a millivoltmeter on terminals 71, 72.
With a screwdriver, adjust the potentiometer until reading 20mA (0-20mA and 4-20mA signal) or
10V (0-10V signal).
The actuator is now ready to operate following an input signal.
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