_______________________________________________________________________________________________________________________________
European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: +44 (0)208 743 8880
www.e-2-s.com Fax: +44 (0)208 740 4200
Document No. D197-00-112-IS Issue B 16-06-17 Sheet 4 of 17 (4)
12) SIL 2 Instruction/Safety Manual
Fig 4 - The SIL 2 Module monitors the Beacon and interfaces to the customer plant.
Warning
–
To maintain the integrity of the SIL 2 units the system must be installed in accordance with this manual. Any
deviation could result in failure of the SIL 2 system and an unintended unit operation or function.
Warning
–
Unit must be installed, commissioned and used within the parameters outlined in this manual. Failure to comply
with this will result in potential unit failure within the system.
Warning
–
The unit must be powered in either Standby or Active modes to comply with the SIL 2 approval requirement.
Warning
–
If the power is disrupted the unit must be allowed to go through the commissioning cycle to reset, if this does not
happen and the power continues to be disrupted the unit will latch the fault and require a hard system reset.
SIL 2 System Description
The E2S BEx range of IECEx & ATEX compliant signaling
devices with integrated SIL 2 fault monitoring modules.
The SIL 2 module monitors the function of the device and
provides feedback to the control panel. A fault condition can
be communicated via independent fault contacts or by the
introduction to the monitoring circuit of an end of line resistor.
A SIL 2 system wiring for fault detection in standby and active
mode
– 4 wire installation can be seen as per section 14.1. A
SIL 2 system wiring for fault detection in standby and active
mode
– 2 wire installation can be seen as per section 14.2.
The new SIL 2 version of the E2S BExS110-SIL & BExS120-
SIL alarm horn sounder and BExBG05-SIL, BexBG10-SIL &
BexBG15-SIL Xenon strobe beacon are designed, tested and
certified, bringing plant safety to new levels.
Key benefits:
•
Signaling
device
function
is
checked
and
automatically reported to the control panel.
•
Eliminates the need for time consuming physical
inspections.
•
Increased plant safety, confidence that all devices
are fully functioning.
•
Designed to integrate seamlessly into your SIL 2
environment.
13) SIL 2 System Terms and Function
The SIL 2 Beacon Unit Monitors
•
Standby mode and Active mode
•
Health status of power supply
•
Beacons correct function and flash pattern
The SIL 2 beacon operates as part of a SIL 2 system.
The beacon will after commissioning remain powered in
Standby mode
(reverse polarity) until the beacon is required
to operate. When the signaling device is required to operate
beacon the polarity is changed back to normal supply and the
beacon will go into
Active mode
where it will start to
function/flash. When testing the system and beacons
operation, the system is put into
Active mode
.
The customer PLC will control whether the system is in either
of the main two operational modes.