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Parameters
| Supply voltage and system |
12÷36 VDC, two-wired system |
| Measured range |
0÷300° |
| Range adjustment |
50÷100% |
| Output signal |
4÷20 mA |
| Protection class |
IP-64 |
| Working temperature |
-25÷70°C |
| Mechanical life period |
practically unlimited |
| VIbration resistance |
15 G |
Description
Application: PPI-01/B has been designed for operation in analog and digital automatic control and measuring systems working in harsh environmental conditions. Especially this transducer has been designed for actuators manufactured by ZAP S.A. in Ostrow Wielkopolski and CHEMAR S.A. in Kielce and those other ones that have been adapted for building in typical potentiometers.
Design: The transducer consists of an enclosure with a screwed stem for mounting, a rotary axle with a mechanical limiter and provided with 2 ball bearings, a rear screw-on cover and undetachable screened cable 500 mm long. Underneath the cover there is a zero adjusting potentiometer, range adjusting potentiometer, and a jumper for reversing the sense of rotation. Inside the enclosure there is a resolver and an electronic type processing system. Different lengths of the cable and axle are available when ordered.
Mounting: The transducer should be mounted to a base plate, 1.5÷3 mm thick, in a hole (F) 10 mm dia., using a locknut and a crown washer. A gear wheel to be fixed on the axle with a friction clutch. The cable should be cut to a proper size, the ends mended and fitted with terminals and the heat-shrinkable tubing (provided in the set). The larger tubing and terminal are for the screen end. Should the gear eccentricity be found (in older actuators) a flexible type base plate to be applied or adequate tooth clearance to be allowed for.
Sealing: The axle - fluorovulcanizate, back cover - water-proof diaphragm, electronic components - silicone filling compound cured chemically.
Starting: Having connected, engaged, and applied the supply voltage to the transducer, check the current flow in the measuring circuit. No current indication means the reverse direction of the applied voltage (the transducer is resistant to that). Next step is overrunning the actuator into a position corresponding to the 20 mA current in the line and setting this value by using the jumper for reversing the sense of rotation and the potentiometer for the range adjustment. Then overrun the actuator into a position corresponding to the 4 mA current in the line and set this value by using the zero adjusting potentiometer. The last operation is returning to 20 mA position and correcting possible deviation that might result from the adjustment action interrelations, by using the range adjustment potentiometer. In practice, when setting the extreme values one should take into account the actuators run-up and possible inaccuracy of the extremes. It is then recommended to set a little bit greater value than 4 mA and a little bit lower value than 20 mA.
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