IM-P358-26 CH Issue 1
25
4. Turn the potentiometers (P2, P3 and P4) to the left with the exception of the sensitivity
potentiometer (P1) which should be turned to the middle position.
5. Set the 'Direction' switch to (+) (increase signal to retract spindle). Set the actuating signal to
4 mA (2 V). Switch on the mains supply.
The actuating drive will move to the lower end position and will be cut off by the limit switch.
6. At this point the multimeter should read 0 V. If it does not turn the shaft of the feedback
potentiometer until the multimeter reads the required 0 V (Figure 28) adjust the start
potentiometer P2 (Figure 29) until the close LED just switches off.
7. Set the actuating signal to 20 mA (10 V). The UP direction LED will light up and the actuating
drive will run to the upper end position and cut off. Gently turn the potentiometer P4 (stroke)
until the multimeter reads 10 Vdc. Gently turn the potentiometer P3 (range) clockwise until
both LEDs indicating the direction of action just extinguish.
8. Adjust the actuating signal through the whole range and check that the actuator positions
accordingly. Correct the sensitivity if required (P1). (Amount of signal variation to move
actuator. Decrease to reduce hunting).
9. Please note that if the potentiometer (P1) is adjusted, Steps 4 - 8 (Section 4.4) must be
repeated.
Similarly, split range settings can be set. The start and end signals must be set to
the required range which differ from the above example.
For increase signal to extend spindle set direction switch to "-". Manually set the
actuator to the uppermost set position and adjust the potentiometer to clockwise
stop. Set up as above (directions will be reversed).
Fig. 29
Neutral
Feedback
position
4 - 20 mA
x5 / 1
x5 / 4
x5 / 2
x4 / 1
x4 / 2
x4 / 3
Volt meter: read 0 - 10 V
2 - 10 V
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