Parker 5703-1 Setpoint Repeater – Multi-Drive Speed-Lock Without Quadraloc Controller

Brand ABB

Model Parker 5703-1

Product Overview

The Parker 5703-1 is a specialized fiber optic setpoint repeater unit designed for use with Parker 590P Series DC digital drives. Unlike generic industrial communication modules, the Parker 5703-1 serves a single, critical function within drive system architectures: it enables a line of DC drives to operate in speed-lock configuration without requiring the more expensive 5720 Quadraloc controller. This makes the Parker 5703-1 an economical yet highly effective solution for multi-drive synchronization applications where accurate speed-holding is required but the extreme precision of the Quadraloc system is not necessary.

At its core, the Parker 5703-1 functions as an electrical signal-to-light converter, transmitting a 16-bit speed signal between drives via fiber optic cable. The unit connects to each drive‘s P3 port—a port otherwise used only for offline EEPROM data upload and download—and converts the RS232-compatible signal levels to fiber optic transmissions. This conversion provides galvanic isolation between drives, eliminating ground-loop currents that can corrupt speed reference signals in multi-drive installations. The Parker 5703-1 itself does not alter the signal in any way; all scaling, ratioing, and speed-locking logic is performed within the drive software, while the repeater unit simply provides a clean, isolated transmission medium.

The Parker 5703-1 is housed in a compact DIN rail mounted enclosure with a 400mm connection cable for the P3 port, while the primary unit-to-unit interconnection is achieved through fiber optic cable. Each unit features one fiber optic receiver and two fiber optic transmitters, providing flexible configuration options for daisy-chain or redundant transmission topologies. When the link selector is in the normal right-hand position, the second transmitter repeats the output signal; in the left-hand position, it repeats the input signal. This dual-transmitter architecture enables the Parker 5703-1 to serve as either a signal repeater or a branching point within a fiber optic drive network.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	Parker 5703-1
Manufacturer	Parker
Product Type	Setpoint Repeater Unit / Fiber Optic Communications Module
Compatible Drives	590P Series DC Digital Drives
Input Interface	P3 Port (RS232 compatible signal levels)
Connection Cable	400mm P3 port cable (provided)
Fiber Optic Interface	1 receiver, 2 transmitters
Fiber Type	Standard industrial fiber optic cable
Signal Format	16-bit speed signal
Mounting	DIN rail mounted enclosure
Power Supply	Derived from drive P3 port
Isolation	Galvanic isolation via fiber optic transmission
Configuration	Link selector for input/output signal routing
Transmission Distance	Extended via fiber optic (far exceeds RS232 limits)

Main Features and Advantages

Cost-Effective Multi-Drive Speed-Locking: The Parker 5703-1 provides an economical alternative to the 5720 Quadraloc controller for applications requiring speed-locked operation across multiple 590P DC drives. By utilizing the existing P3 port and fiber optic transmission, the Parker 5703-1 eliminates the need for additional controller hardware while still delivering reliable speed synchronization. For installations where the absolute precision of the Quadraloc system is not required, the Parker 5703-1 offers a practical solution that reduces both equipment cost and cabinet space requirements.

Complete Galvanic Isolation via Fiber Optics: The Parker 5703-1 converts electrical RS232 signal levels to fiber optic transmissions, providing complete galvanic isolation between interconnected drives. This isolation is critical in multi-drive systems where significant ground potential differences can exist between drives powered from different sources or located in separate electrical enclosures. Without isolation, ground-loop currents can introduce noise into the speed reference signal, causing speed instability or synchronization errors. The Parker 5703-1 eliminates these risks entirely, ensuring clean signal transmission regardless of grounding conditions.

Flexible Dual-Transmitter Architecture: Each Parker 5703-1 unit is equipped with one fiber optic receiver and two fiber optic transmitters, providing exceptional configuration flexibility. The unit can function as a simple repeater, extending the transmission distance of the speed signal; as a branching point, allowing one drive’s signal to be distributed to multiple downstream drives; or as a redundant transmitter, providing backup signal paths. The link selector switch determines whether the second transmitter repeats the incoming signal or the outgoing signal, enabling the Parker 5703-1 to adapt to diverse network topologies without hardware modification.

Seamless Integration with 590P Drive Platforms: The Parker 5703-1 is purpose-built for the 590P Series DC digital drive platform, utilizing the P3 port that is standard on every drive in the series. The provided 400mm P3 cable ensures reliable connection while limiting transmission errors within the drive enclosure. Configuration is performed entirely through the drive software—the Parker 5703-1 can be configured to point to any relevant parameter in the drive block diagram, with default connections routing the scaled input to “additional speed demand” and the output to “speed demand.” This software-based approach simplifies commissioning and allows the repeater to adapt to specific application requirements.