Bernard Controls MINIGRAL+ Anleitung Seite 11

3 COMMISSIONING OF MINIGAM+ POSITIONER CONTROL
3.1 DESCRIPTION
MINIGAM+ controls are used for valve class III modulating and is operating with 0-20mA, 4-20mA or 0-10V
input signals.
MINIGAM+ control board allows an accurate positioning (<2%).
The dead band can be set to adjust the accuracy of the positioning.
A potentiometer is always built-in with the MINIGAM+ board in order to provide a position feedback signal.
3.2 NOTES REGARDING THE ELECTRICAL CONNECTIONS
The MINIGAM+ is driven by an analogue signal and supplies an
output signal for remote position indication.
The signal cables have to be of a shielded type and be separa-
ted from power supply wires (1-inch distance min.). Otherwise
interference may occur.
The cable shield must be connected to terminal 71 and isolated
from the earth. If motorised valve setting has not already been
done by the valve supplier, please proceed as stated below.
3.3 MINIGAM+ CONFIGURATION
Different operating parameters are adjustable thanks to switches located on the circuit board.
Two switches located on the printed circuit board are used to select the "positioning" mode:
- Switches 5 and 6 positioned on A
Switches 1,2,3 and 4 allow to set the types of input-output signals.
Input Output
Signal Signal
0 to 10V 0 to 10V
2 to 10V 2 to 10V
4 to 20mA 4 to 20mA
0 to 20mA 0 to 20mA
Please note : Output signal doesn't need external voltage.
The switch 7 allows to set the direction of rotation :
- Switch 7 in A position: closing in clockwise direction.
- Switch 7 in B position: closing in counter clockwise direction.Switches (on printed circuit
board) are used to set the input and output signals of MINIGAM+ mode :
3.3.1 SELECTION OF POSITIONING OPERATION
3.3.2 SELECTION OF INPUT-OUTPUT SIGNALS
Switches position
1 2 3
B B B
B B B
A A A
A A A
3.3.3 MOTOR DIRECTION OF ROTATION
Input signal specification
4
Signal
B
A
0-20mA
4-20mA
A
0-10V
B
Input
impedance
260ohm
260ohm
10kohm
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