European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: +44 (0)208 743 8880
Document No. D157-00-651-IS
Issue 2
06-03-2023
Sheet 8 of 14
The SIL 2 unit will also check for signal polarity.
If a fault is found the SIL 2 unit will go into
Fault mode
.
If power is disrupted the SIL 2 unit will go into
Fault mode
, in
fault mode the Power relay RLY1-1 will close whilst SIL 2 relay
RLY1-2 will become open be circuit between terminals 1 & 2.
Fault modes
- The fault modes listed 12-1 & 12-2 below will
make the SIL 2 unit change the state for relays RLY1-1 and
RLY1-2.
In fault mode the Power relay RLY1-1 will close whilst SIL 2
relay RLY1-2 will become open circuit between terminals 1 &
2.
12-1 Sounder Failure
•
Tone Failure
–
No Tone detected
•
Sounder Controller failure
–
No tone generation pulse
detected
•
Tone Rate Failure
–
Regular tone cycle erratic
12-2 Power Failure / SIL 2 Failure
•
SIL 2 Controller failure
–
Internal function and system
checking flags fault
•
Rapid Power cycling
–
System indicates power
instability
•
Total Power Failure
It is possible to reset these faults if they were transitory.
Resetting Failure (by power cycling) - It is possible that the SIL
2 unit can be reset by powering the unit off for a period greater
than 20 seconds. On restarting the unit and running through
the commissioning cycle the fault may clear.
Resetting Failure (by Hard Reset) - It is possible that the SIL 2
unit can be reset by hard resetting the unit using the reset
jumper within the unit (see section 15-4) on hard resetting.
On restarting the unit and running through the commissioning
cycle, the fault may clear. It is necessary to run the test function
cycle again to see if the fault is still evident.
If the hard reset process does not correct the latched fault the
alarm horn sounder may require further investigation, please
contact your local E2S representative.
Commissioning System - Functional start-up of System
(Normally in reverse polarity mode)
When Commissioning system the power must not be disrupted
to the SIL 2 Unit within the unit’s initialization cycle which is
5
seconds
.
Once past this period the SIL 2 system is fully operational and
will be in monitoring the sounder and power in Standby mode.
The relay RLY1-2 on the SIL 2 unit will only remain open for a
maximum of 1 second on commissioning start-up. RLY1-2 will
subsequently close contacts 1 & 2 indicating healthy
operation. Contact 1 & 2 will only remain open in the event of
a fault or a loss of power.
System Testing (Active Mode normal polarity)
The SIL 2 system will remain monitoring the power in standby
mode until the polarity is changed to normal mode to enable
an active system for sounder functional testing.
Important
: - The polarity must be held in active mode for a
period in excess of
15 seconds
to ensure a full system check
is performed.
Once the test period has been completed the unit can be
switched back to standby mode by reversing the polarity.
If no faults have been found during the test the relays will
remain in steady state.
The SIL 2 unit will continue to monitor the power and module
function.
Important
: - The automated test cycle
must
be undertaken on
at least a weekly basis to maintain the SIL 2 units reliability.
System Activation (Active Mode normal polarity)
The SIL 2 system will remain monitoring the power in standby
mode until the polarity is changed to Active mode to enable an
active system for sounder to function as a warning signaling
device.
Important
:- The polarity must be held in active mode for a
period in excess of 15 seconds to ensure a full system check
is performed whilst in alarm mode, although it is expected that
during a system activation this period will be significantly
greater.
Note
:- The fault indication signal on TB1 can take up to 50
milliseconds to indicate system fault.
