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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-54 |
| Working temperature |
-25÷70°C |
| Mechanical life period |
practically unlimited |
| VIbration resistance |
15 G |
Description
Application: PPI-01/A has been designed for operation in analog and digital automatic control and measuring systems working in harsh environmental conditions.
Design: PPI-01/A transducer consists of an enclosure, inside of which there is a rotating sleeve fitted for mating with a counter-stud. There is a mechanical limiter for the sleeve. Inside the enclosure there is a resolver and an electronic type processing system. Adjusting potentiometers and a jumper for reversing the sense of rotation have been placed under the screwed-on cover. A screened cable 500 mm long is permanently attached to the enclosure.
Mounting: The transducer is mounted in SWA, SWB and SWC actuators in the place of a potentiometer, by screwing the enclosure with 2 studs provided, through the holes used previously by the potentiometer. If the gear wheel has been found rubbing at the transducer enclosure (in old type actuators), a spacer washer to be put under the enclosure (delivered with the order). 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 size tubing and terminal are for the screen end.
Starting: The mechanical engaging to be performed by screwing the counter-stud cap in, while locking the transducer sleeve with the No.6 spanner. 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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