Induction Type Angular Position Transducer PPI-01/C

Parameters

Description

Application: PPI-01/C transducer has been designed for operation in analog and digital automatic control and measuring systems working in harsh environmental conditions. Especially PPI-01/C has been designed for mounting in actuators series NWA 78 and NWA 100 manufactured by CHEMAR S.A. in Kielce and those other ones that heve been adapted for building in typical potentiometers.
The PPI-01/C transducer can be used also with other actuators, when there is not sufficient space for placing there the PPI-01/B transducer.

Design: PPI-01/C transducer consists of a resolver placed in an enclosure that is fitted for mounting on a screw, and of a rotary axle with a mechanical limiter. All that is connected with a permanent cable to the transducer. Adjusting potentiometers and a jumper for reversing the sense of rotation have been placed under the screwed-on cover. The transducer has been provided with a 500 mm long permanently attached cable.

Sealing: The axle - fluorovulcanizate, back cover - water-proof diaphragm, electronic components - silicone filling compound cured chemically.

Mounting: A detailed description of the transducer mounting in the NWA-78 drives, in the older model and in the new model of NWA-100 drives has been presented in the drawings. The only work necessary before mounting, which has to be done at the workbench, is drilling a hole F 45 mm in a plastic scale of the power transmission systems mechanical indicator. The mounting procedure has been prepared with regard to provide convenient access when servicing the adjusting potentiometers and the jumper for reversing the sense of rotation.
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.

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.