Key Features

The 5701 Series Control System is part of the 57 System family and is designed to monitor and control field installed industrial gas detectors.

The key features of the system are as follows.

Provides up to 16 gas detection channels in a standard 19” subrack using a 3U card format.

Provides up to 8 gas detection channels in a 3U card format in a half 19” subrack.

Racks are available for both front and rear wiring.

Simple field connection for wires up to 2.5mm2.

Single channel operation mode for high integrity systems.

Channel control cards are removable and do not interfere with other wiring.

Catalytic bridge or 4 – 20mA input.

Optional alarm switching relay output.

Multi-alarm modes for master, zone and voting alarms.

UP, DOWN, STEL and LTEL / RATE alarm outputs.

Update alarms for single or multi-channel alarms.

Remote inhibit and reset inputs.

Relay output on and/or off delay.

Selectable 0 – 20mA or 4 – 20mA isolated monitor outputs.

Easy calibration and operation with dedicated engineering card.

EMC compliant.

Options available through engineering card:

* Master alarm update.

* Event printer.

* Serial communication using Modbus protocol.

Architecture

The system consists of a single 1” (2.54 cm) wide board mounted in a ruggedized rack designed for European style cabinets.

Two rack widths are available:

a. 19-inch with 17 card slots for up to 16 channel control cards and one engineering card.

b. Half 19 inches with 9 card slots for up to 8 channel control cards and 1 engineering card.

Each subrack contains one engineering card and one DC input card to form the rack system.

The system is designed to accommodate different customer wiring configurations, and for this reason, the control functions are separated from the relays and field wiring connections.

Therefore, single channel gas detection consists of :

a. Sensor Driver Module

For compatibility with a wide range of input and sensor types, the circuitry required to control the sensors is mounted on separate plug-in sensor driver modules.

These modules plug directly into the channel control card and are factory installed. www.abb-drive.com Two different modules are available, one for catalytic inputs and the other for 4 – 20mA inputs.

b. Single Channel Control Cards

Each single-channel control card is self-contained and contains all the necessary electronic circuitry to provide sensor actuation, alarm detection, and gas level indication for that gas detection channel.

c. Field Interface or Relay Card

Field interface/relay cards provide interface connections between the control card and the respective field-connected gas sensors. In addition, relay cards provide alarm outputs for field connections.