BEKA BA3903 Pageant RS485-IS Connector Instructions
- June 9, 2024
- BEKA
Table of Contents
BEKA BA3903 Pageant RS485-IS Connector
INTRODUCTION
The BA3903 enables an RS485-IS twisted pair bus cable to be easily connected to, and looped-through, a device with a standard RS485-IS port. The BA3903 incorporates a sub D9 male connector that mates with the standard female connector on an RS485-IS device, such as a Pageant plug-in CPU module. The BA3903-IS connector contains duplicate input and output screw terminals enabling twisted pair field wiring to be easily connected to, and looped- through, the RS485-IS device. The BA3903 connector also contains a switchable terminating resistor for use at the end of an RS485-IS line.
RS485-IS PHYSICAL LAYER
RS485-IS is a 2-wire intrinsically safe communications standard. The physical
layer standard is summarised in the, ‘Profibus RS485-IS User and Installation
Guideline’. The maximum intrinsic safety input and output safety parameters
for each device are defined allowing up to 32 devices to be connected to a
single bus cable However, the maximum current output of the fieldbus isolator
powering the bus cable may restrict the number of devices that can be
connected.
CONNECTIONS AND USE
- Step 1 Unscrew the back cover retaining screw and carefully lift it off.
- Step 2 For connecting to a field device and looping-through the bus.
- Step 3 Reassemble the BA3903 connector Ensure that the two jack-screws are correctly positioned before refitting the top cover and replacing the securing screw.
When the BA3903 connector is used for connecting the bus to a RS485-IS field device and looping the bus through the device, discard the plate covering the bus out cable exit and slide the terminating resistor switch into the not connected position. Connect the bus cable to the appropriate in and out terminals ensuring that the two cable retention clamps are in electrical contact with the bus cable braid to maintain cable screen continuity
Earthing
The screen of the RS485-IS twisted pair bus cable should be earthed in the safe area as shown in Fig 1. If a BA3903 connector is plugged into a socket on a hazardous area RS485-IS port which has an earthed connector shroud, care should be taken to avoid circulating currents. Ideally each intrinsically safe circuit should only have a single earth connection in the safe area. Multiple earth connections should be connected to the plant’s potential equalising conductor.
MAINTENANCE
Pageant BA3903 connectors should be regularly inspected to ensure that they have not been damaged. The frequency of inspection depends upon environmental conditions. No attempt should be made to repair a faulty BA3903 Connector. Suspect Connectors should be returned to BEKA associates or your local BEKA agent.
GUARANTEE Connectors which fail within the guarantee period should be returned to BEKA associates or your local BEKA agent. It is helpful if a brief description of the fault symptom(s) is provided.
CUSTOMER COMMENTS BEKA associates are always pleased to receive comments from customers about our products and services. All communications are acknowledged and whenever possible, suggestions are implemented
BEKA
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