European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: +44 (0)208 743 8880
Document No. D190-00-651-IS
Issue 2
06-03-2023
Sheet 9 of 15
Fault modes
- The fault modes listed 13-1 & 13-2 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.
13-1 Sounder Failure
•
Tone Failure
–
No Tone detected
•
Sounder Controller failure
–
No tone generation pulse
detected
•
Tone Rate Failure
–
Regular tone cycle erratic
13-2 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 16-4) 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.
