Rotary transducers

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PR20

Rotating potentiometer transducers

PR20

Rotating potentiometer transducers

The PR20 transducers convert rotary motion into a resistance variation, ensuring high precision and reliability for industrial applications.

Main features:

• Through-hollow shaft with Ø20 mm bore.

• Shock-resistant, self-extinguishing housing, resistant to solvents, gasoline, oils, and grease.

• Precision rotary potentiometer driven by a transmission system connected to the drive shaft.

• Available with 1, 3, 5, or 10-turn potentiometers, with gear ratios in multiplication or reduction.

• Gear reducer with clutch for potentiometer protection.

• For proper use, it is essential to know the number of revolutions the drive shaft must complete to cover the total measuring stroke (see Pitch table).

Available versions:

• PR20: cable output.

• PR20C: connector output.

• PR20-I: integrated analog interface, 24V DC power supply, 4-20mA output.

• PR20-V: integrated analog interface, 24V DC power supply, 0-10V output.

• PR20-RS485: RS485 Modbus RTU serial interface for position measurement and diagnostic data transmission to the PLC. user guidance with 3 fully customizable status LEDs (red/green). Compatible with communication protocols: Profinet, EthernetIP, Powerlink, and EtherCAT via GatewayPR20.

Applications:

When combined with an electronic display (V4P, P3X, it provides an economical and effective measurement system for position control in machine tools, automation, woodworking, marble processing, and other material machining, with a maximum resolution of ±0.1 mm

Photogallery

APPLICATION EXAMPLES

Angular position control of a pivoting arm

Linear position control of an axis

PR20

1. Lock-pin

2. Fixing screw

3. Fixing bores

PR20C

1. Lock-pin

2. Fixing screw

3. Fixing bores

EMC 2014/30/EU

Weight 180 gr

Accuracy PR20RS: 16 bit

Colour Grey RAL 7004

Conversions/second PR20RS: 12

Electric connection PR20: cable length 2,5,10 meters
PR20C: 4 poles connector
PR20RS:
cable 2m, other measures on request;
connector M12x1: 4 poles male;
Splitter M12T: 4 poles male + 4 female;
Splitter M12Y: 4 poles female + 4 female

Field bus interface PR20RS: Modbus (Profinet, EthernetIP, EtherCat, Powerlink)

Linearity ± 0,25%

Maximum rotation 340° ±4°
1080° ±10°
1800° ±10°
3600° ±10°

Maximum rotation speed with ratio 1/1 400 RPM, 1000 RPM for short periods

Nominal power 1 W

Output hollow shaft Ø 20 H7

Potentiometers (rev.) 1 (340°) - 3 (1080°) - 5 (1800°) - 10 (3600°)

Power supply PR20RS: 10 - 30 Vdc max 100mA

PR20, PR20C: hollow shaft foro 20 H7

Protection degree IP54

Range PR20RS: 0, 65535

Relative humidity 10 ± 90 %

Resistance 10 KOhm

RoHs 2011/65/UE

Transmission ratios PR20 multiplying: 1/3 - 1/2;
reduction: 1/1 - 3,3/1 - 10/1 - 12/1 - 18/1 - 24/1 - 30/1 - 54/1 - 72/1 - 90/1

Working temperature -10 ± 70°C

Reducing technopolymer bushes for OP.
➜ for more complete information, see BF

The P Interface turns the signal supplied by a potentiometric transducer into current 0-20 mA, 4-20 mA or voltage 0-10Vdc.
Its typical employment is the current or voltage transmission of signals supplied by a remote potentiometric transducer to remote supervision systems.
Special features of the P interface are its low cost and simple setting: activating two trimmers it’s possible to refer the entire output range to the stroke of the poten-tiometer effectivly employed.
The instrument is carried out in a 3-module case for assembling on DIN EN50022 guide.

VERSIONS

VERSIONS
INTP0	Power supply 115Vac
INTP1	Power supply 230Vac
INTP2	Power supply 24Vac
INTP3	Power supply 24Vdc

TECHNICAL FEATURES
Input impedance	1 Mohm
Linearity	endless
Max. load impedance for current output	600 Ohm
Min. load impedance for voltage output	1Kohm
Output resolution	12 Bit
Outputs	0÷10 Vdc; 4÷20mA; 0÷20mA
Potentiometer input	1÷50 Kohm
Power supply	115Vac, 230Vac, 24Vac, 24Vdc 3VA
Relative humidity	10 ÷ 90 %
Working temperature	÷50°C
EMC	2014/30/UE
RoHS	2011/65/UE

DIMENSIONS

The instruments of the V_P series are multifunction microprocessor display units with input from potentiometric transducer that are particularly indicated for the measurement of linear and angular dimensions.
• V4P: the measured value can be compared with 2 or 3 alarms settable for enabling many relays whose status is displayed by LEDs. Two analog outputs, a voltage 0-10V or -10 to +10 V, the other 4 ÷ 20mA 12-bit resolution, and its possible to configure the instrument and check its status via serial interface RS485 with MODBUS RTU protocol.
➜ for more complete information, see V_P

The P_X positioning units serie are programmable microprocessor single-axis positioner with relay or analogue outputs.
• P3X: processes signals provided by potentiometric position transducers linear or rotary. The 16-key keyboard with 6 operation indicators make it simple and easy to use and the setup of the positioner.
➜ for more complete information, see P_X.

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PR20
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TRANSMISSION RATIO CALCULATION

To optimize the precision, it is essential to select a transmission ratio and potentiometer combination that provides a slightly higher number of turns than required to cover the full stroke.
Available potentiometers:
1 turn (340°) - 3 turns (1080°) - 5 turns (1800°) - 10 turns (3600°)
Each potentiometer can be paired with a reduction or multiplication transmission ratio from the available options:
Multiplication: 1/3 - 1/2
Reduction: 1/1 - 3.3/1 - 10/1 - 12/1 - 18/1 - 24/1 - 30/1 - 54/1 - 72/1 - 90/1

PRACTICAL EXAMPLES

Example 1. - Calculation with a known number of turns

The transducer must complete 230 total turns to cover the full potentiometer stroke.
Choice: 10-turn potentiometer with a 24/1 transmission ratio
Calculation: 24 × 10 = 240 turns
➜ A small surplus of turns is always recommended to ensure a safety margin

Example 2. - Calculation with known distance and pitch

A screw with a 4 mm pitch must travel a distance of 550 mm.
Required turns calculation:
550 ÷ 4 = 137.5 turns
Selection: 5-turn potentiometer with a 30/1 transmission ratio
Calculation: 30 × 5 = 150 available turns

Example 3. - Angular displacement measurement

An angular displacement of 105° must be measured.
Selection: 1-turn potentiometer (340°) with a 1/3 multiplication ratio
Calculation: 340 ÷ 3 = 113.5° available
➜ For angular measurements, a 1-turn potentiometer is preferable for higher accuracy

PR20 - multiplying	PR20 - reducing
1/3	1/1
1/2	3,3/1
	10/1
	12/1
	18/1
	24/1
	30/1
	54/1
	72/1
	90/1