Overview

This document provides detailed technical specifications, design varieties, and application guidelines for motor-driven potentiometers and set-point adjusters manufactured by FSG Fernsteuergeräte and Kurt Oelsch GmbH. These devices are primarily used in control and regulating circuits for presetting reference variables, signal conversion, and servo systems.

1. Product Types and Models

• Motor-Driven Potentiometers: Various series including PW309, PW613, PW620, PW70, and PW100 with angles of rotation around 340°-345°, resistance values from 10 to 100 ohms, and linearity between ±0.1% and ±0.5%. Multiple designs include two-fold to six-fold ganged potentiometers.
• Set-Point Adjusters: Available as manual (hand control) or motor-driven (DC or AC motors) devices. They include single or multiple ganged potentiometers with resistance, voltage, or current outputs. Accessories include cam-operated switches and signal converters.
• Servo Systems: Series M7-G30-PW613 designed for use in bridge or compensating circuits, often combined with servo amplifiers for indirect-acting measuring instruments.

2. Technical Specifications

• Motors: Synchronous motors (type M4) operate at 24, 48, 110, or 220 V with frequencies of 50 or 60 Hz and speeds of 250-300 rpm. DC motors (types M3 and M7) operate at 6, 12, or 24 V DC with nominal speeds around 3600 rpm.
• Running Periods: Standard gear running periods are 15, 30, 60, or 120 seconds, adjustable via built-in controller boards from 1 to 100 seconds. Gear series G30 offers approximately 1-second running time for follow-up systems; series D allows regulating times from 10 seconds up to 24 hours.
• Electrical Data: Supply voltages typically 18-33 V DC with current consumption around 40 mA. Switching voltage up to 250 VAC or 30 VDC, switching current up to 6 A (inductive load). Switching hysteresis less than 1°.
• Signal Inputs and Outputs: Inputs include 0-20 mA (Ri 50 ohms) or 0-10 V (Ri 10 kOhm). Outputs suitable for motor-driven potentiometers with resistance, voltage, or current outputs (0/4-20 mA or 0-10 V). Input and supply are electrically isolated.

3. Mechanical and Environmental Data

• Casing: Sheet steel with plastic bezel, protection rating IP44 front and IP10 rear.
• Temperature Range: Operating from -30°C to +70°C.
• Dimensions: Flush mounting formats according to DIN 43700 with panel cut-outs for sizes 48x48 mm, 72x72 mm, 96x96 mm, and 144x144 mm.
• Scale and Display: Various scale types (C and B), with options for white scale background and black graduation marks. Marine design variants include sight glass covers and pointer disks.

4. Functional Features and Accessories

• Set-point adjusters typically include two limit switches for endpoint limitation; larger sizes (96x96 mm and above) can have up to six cam-operated switches.
• Motor-driven potentiometers can be equipped with permanently adjusted or cam-adjustable limit switches.
• Signal converters and servo amplifiers are available as accessories to enhance functionality, including speed control of DC motors and adaptation of running periods.
• Applications include control desk instruments, switch cabinet mounting, analogue computing and regulating circuits, and marine applications such as rudder angle selection and engine room telegraphs.

5. Application Notes and Recommendations

• All potentiometers can be customized with any resistance value, angle of rotation, taps, and short circuit sections.
• Running periods and control times can be adapted to specific application needs using built-in trimming potentiometers or servo amplifiers.
• For servo systems, motor-driven potentiometers provide cost-effective, high-precision indirect measurement and control solutions.
• Electrical isolation between input and supply is mandatory for proper operation.

6. Standards and Testing

• Testing voltage: 550 V, 50 Hz, 1 minute.
• EMC compliance according to DIN EN 50081-1 and DIN EN 50082-1.

Summary

The document comprehensively details the design, technical parameters, and application scope of motor-driven potentiometers and set-point adjusters used in industrial control systems. It emphasizes modularity, customization, and compatibility with various control circuits, highlighting their use in servo systems and marine environments. Key features include adjustable running periods, multiple output types, robust mechanical design, and compliance with relevant standards.