E2S D1xB2X Series, Инструкция по эксплуатации

Страница: 8 / 19

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH sales@e2s.com Tel: +44 (0)208 743 8880
www.e2s.com Fax: +44 (0)208 740 4200
Document No. D191-00-601-IS Issue 1 20-03-2020 Sheet 8 of 8
16)
SIL 2 Wiring configuration and Beacon set-up
Figure 5 – Terminals and header pins for beacon
Power & Communication with the system control panel can be configured in two ways: - Although it is highly recommended that the
unit is wired as stated in this section 16-1

16-1 SIL 2 system wiring for fault detection in standby and active mode – 4 wire
installation (Recommended)
The customer is required to wire into both the beacon power supply terminals and also the SIL 2 Relay terminals TB1
The power supply terminals only need to have the supply power connected. This will be reverse polarity for monitoring mode and
normal polarity for active mode. There is no need to fit an EOL resistor on the power supply terminal as the TB1 is configured to
raise a fault alarm in any situation.
TB1 the SIL 2 monitoring relay, RLY 1-2 on the SIL 2 board which whilst powered is closed between TB1 terminals 1 & 2, however
on any fault will become an open circuit between TB1 terminals 1 & 2.
The fault will be seen via the SIL 2 TB1 terminals as soon as the fault occurs in either Active or Standby modes.
As factory default when there is no fault, the TB1 terminals 1 & 2 will be closed putting a 3.3k Ω current sense resistor in line.
If the circuit is driven with 24V dc the detection current seen is ~7.3mA @ 24V.
System faults will make RLY 1-2 contacts go open circuit between terminals 1 & 2 for any fault mode.
The only other fault mode is if the cable goes short circuit where a short will be seen by the panel.
There is an option (although not recommended) to alter the enable J1 header pin to link pins 1 & 2 (see figure 8) which shorts out
the 3.3K
Ω current sense resistor making TB1 terminal 1 & 2 into a switch. The disadvantage is that a short circuit on this cable
will not be detected
Figure 6 – Schematic of SIL 2 system wiring for fault detection in standby and active mode – 4 wire installation
TB1 Current
Sense Resistor
value
Current
drawn
(mA)
3.3k Ω 7.2mA
Beacon power
supply terminal
block
Current
drawn
(mA)
Active Mode 190mA
Standby Mode 25mA
Beacon Power Supply
Terminals
SIL Relay Terminals TB1
J1 Header – Shown in
factory default position A
(see section 18.3), places
TB1 Current sense
resistor in circuit
J2 Header – Shown in
factory default position A
(see section 14.3) removes
power supply terminal block
Fault resistor out of circuit.
On fault mode, current drops
to 0 as circuit goes open.
J7 Header – Shown in
factory default position A
(see section 20), set to
Normal operation
- - + +
1 2 3
For one unit only: