Product Overview

The SZG65 WDGA SSI is a rugged draw-wire length measurement system designed for harsh industrial environments. Typical applications include lifts/elevators, lifting platforms, theatre stages, forklifts, and cranes. It offers measurement ranges from 0 mm up to 1250 mm with high precision and reliability.

Specifications

• Measurement Range: 0 to 1250 mm
• Resolution: Varies by bit per revolution, from 8 bits (approx. 2.5 positions/mm) up to 12 bits (approx. 40.9 positions/mm)
• Deviation: Less than 0.02% of the final value
• Measuring Wire: 0.48 mm thick nylon-coated high-grade steel wire
• Max Wire Speed: 7.5 m/s
• Pull Out Strength: Approx. 0.14 kg
• Housing: Anodised aluminium with chrome-plated steel case
• Weight: Max 1 kg including encoder
• Life Expectancy: At least 10 million cycles
• Operating Temperature: -20 °C to +70 °C
• Storage Temperature: -30 °C to +80 °C

Interface and Electrical Data

• Interface: SSI (Synchronous Serial Interface)
• Clock Input: Via opto-coupler, frequency 100 kHz to 500 kHz (up to 2 MHz on request)
• Data Output: RS485/RS422 compatible
• Output Code: Gray or binary code selectable
• Parity and Error Bits: Optional even/odd parity and error bit
• Turn On Time: Less than 1.5 seconds
• Supply Voltage: 10 VDC to 30 VDC or 4.75 VDC to 5.5 VDC
• Power Consumption: Max 0.8 W

Functional Features

• Absolute length measurement with position value retention during power loss, eliminating the need for reference runs.
• Intelligent spring suspension and nylon-coated stainless steel wire ensure long service life under difficult conditions.
• Compact design allows installation in tight spaces with flexible mounting options.
• Preset function to set zero position by applying +Ub for 2 seconds; deactivation by grounding the preset input.
• Positive direction defined by DIR input signal.

Ordering Information

The product code structure allows customization based on measurement range, wire type, mounting direction, resolution, interface, software version, output code, power supply, galvanic isolation, and connection type. For example:

• Measurement Range: 1250 = 1250 mm
• Wire: N = 0.48 mm nylon-coated steel wire
• Mounting Direction: UP, DN, FR, BK (wire exit up, down, front, back)
• Resolution: 8 to 12 bits singleturn
• Multiturn Resolution: 6 to 24 bits
• Interface: SI = SSI
• Software: A = latest release
• Code: B = binary, G = gray
• Power Supply: 0 = 10-30 V, 1 = 4.75-5.5 V
• Galvanic Isolation: 1 = yes
• Connection: CB8 (8-pin connector), L2 (2 m cable, IP65)

Connection Details

The encoder uses an 8-pin axial connector (CB8) or a 2 m shielded cable (L2) with the following pin assignments:

• Pin 1: GND (white)
• Pin 2: Plus U+ (brown)
• Pin 3: SSI CLK+ (green)
• Pin 4: SSI CLK- (yellow)
• Pin 5: SSI DATA+ (grey)
• Pin 6: SSI DATA- (pink)
• Pin 7: PRESET (blue)
• Pin 8: DIR (red)
• Shield: Connected to housing

Safety and Usage Notes

• The product is intended for industrial environments only and is not designed for safety-related applications.
• Installation and assembly must be performed by qualified personnel.
• Maximum cable length is 20 m at transmission rates up to 500 kHz; longer cables available on request.

Additional Mechanical and Electrical Data

• Mounting screws: M3 or M4 with specified torque values (1 Nm for M3, 2 Nm for M4)
• Operating temperature ranges vary by model, with some supporting down to -40 °C and up to +100 °C.
• Output circuit uses RS485 standard for robust communication.

Summary

The SZG65 WDGA SSI draw-wire encoder is a highly precise, durable, and flexible length measurement solution suitable for harsh industrial applications. Its absolute measurement capability, robust mechanical design, and configurable interface options make it ideal for integration into various lifting and positioning systems.