CONTROL SYSTEMS
J585 ST-RELAY16
2192-10475-000-000
Page 3
Introduction
The ST-RELAY16 board contains sixteen single-pole changeover relays. Five of the relays
have both their normally closed and normally open contacts brought out to the output
connector. The remaining 11 relays are fitted with jumpers to allow either the normally open or
normally closed contact to be used. The board provides up to 1000V of electrical isolation
between your STE based control system and the electrical system being controlled. The
isolation between adjacent channels is limited by the wiring and connectors to 100V. The
power switching rating for the relay contacts is 60W (resistive load). The relays and board
layout are designed to switch voltages up to 220V DC (125V AC) and currents up to 2.0A.
Arcom recommend that for safety reasons 48V DC should be the maximum voltage switched
by this board.
Features
• 8 changeover relays with a power switching rating of 60W (resistive load)
• Switching voltage upto 48v DC and switching currents up to 1.0A
• Output status readback register
• Relay drivers disabled on power up and reset
• Both normally closed and/or normally open contacts are available at the output connector
• RC snubber networks on all outputs
• STEbus interface (ANSI/IEEE Std. 1000-1987)
• Board access LED
• Operating temperature range, -20°C - +70°C
• Power consumption @ +5V +/- 5% 480mA max. with all relays energised
• MTBF: 47,000 hours (using generic figures from MIL-HDBK-217F at benign ground)
Handling
All STE boards contain CMOS devices that could be damaged in the event of static electricity
being discharged through them. At all times please observe anti-static precautions when
handling the board and always unpack and install the board in an anti-static working area.
Software
A Utility Disk is supplied with your ST-RELAY16. It contains a host of software utilities
designed specifically for each board. Please refer to the README.TXT file on the disk for
further information.
