Contents
All emergency lighting units type -SRM include an automatic self-testing function. Every 8 days a test will be automatically performed. The functionality of the unit, the lamp (LED or fluorescent tube) and the battery are being tested during 2 minutes. Additionally, every 12 months, a full duration testing is being performed.
The self-tests are started without taking the status of the emergency lighting in maintained mode into account. The lamp will be turned on and supplied from the battery, no matter if it was on or off in maintained mode at the starting time of the self-testing.
Computer addressable units over M-BUS
If a DUROLIGHT-SRM emergency light is connected to a remote control system through the M-BUS, the self-test is triggered once a week by the monitoring device. In this case, it is possible to determine the day of the week and the time for test start. If communication with controller is interrupted at the time of the test, the test is started automatically about one day later. Once the communication is back in order, the final result is transmitted back to the controller. The self-tests are carried out without taking into account the state of the lamp in maintained operation. This means that the lamp is ignited and powered by the battery. In the case of power failure during the test, the test is continued. Power interruptions shorter than one minute have no effect on the eight day cycle (seven day cycle for M-BUS system). The first test is started eight or seven days after installation to determine full functionality of the luminaire after system commissioning. This is a duration test run for the devices rated operation time, followed by the full recharge of the battery. Since the time and day of the week in a M-BUS system can be programmed independently for even and odd devices, and for standalone devices the test interval is 8 days with random delay between 0 and 6 hours, there is low probability that two adjacently mounted luminaries are tested at the same time. Thus it is unlikely to have fully discharged batteries in these lights simultaneously.
Within one year a full duration testing followed by a battery re-activation is being performed.
Remote control
To monitor all emergency lights in a central location, all -SRM or -SRMMB emergency lighting units are connected via the bus line with the monitoring controller.
Errors
Battery charging fault
A battery charging fault detection (most often due to a faulty connection of the battery) is resulting in the following faulty status:
- The mains operation is inhibited. The lamp is in its off-state, no matter if the emergency lighting is on or off in maintained mode.
- The signal LED (visual indicator) is flashing red (within a 1 second period).
- All the following self-tests are inhibited.
Important note:
The battery charging is continuously monitored, independently of the self-testing cycles. If the battery is disconnected or its connection faulty under mains operation, there can be some delay until the battery charging fault is actually being detected. For example in case of charging cycles necessary to charge NiMH or Li-Ion batteries, the charger is blocked during long periods and is only working during shorter ones. The battery charging can obviously only be monitored when the charger is effectively into operation.
Battery charging fault clearing
Due to the continuous monitoring of the battery, the battery charging fault condition will be cleared as soon as the faulty condition is removed. The mains operation will be released and the signal LED turned on green.
Important note:
- The re-initialisation after battery charging fault clearing is considered as a new start of the emergency lighting. This means that the testing cycle will start again from the beginning (first duration test within 8.5 days and the following one within one year).
- The fault status will be transmitted to the supervision unit.
Battery capacity fault
If the battery capacity is not sufficient to perform the self-testing in its full duration (in this case the battery is fully discharged before the end of the test), the following faulty status is happening :
- The signal LED (visual indicator) is flashing red (with a 1 second period).
- All the following self-tests are inhibited.
Important note:
- In this case, contrary to battery charging fault, the mains operation is not inhibited.
- The fault status will be transmitted to the supervision unit.
Battery capacity fault clearing
This faulty condition will be reinitialised as soon as the battery is replaced by a new one. Due to the continuous monitoring of the battery, its replacement can be monitored. After that, the signal LED will turn on green again.
Important note:
- The re-initialisation after battery capacity fault clearing is considered as a new start of the emergency lighting. This means that the testing cycle will start again from the beginning (first duration test within 8.5 days and the following one within one year).
- The fault clearing condition will be transmitted to the supervision unit. Through the supervision unit it is possible to signalise this fault clearing status, to print it and to record it centrally, or to transmit it further.
Lamp (LED or fluorescent tube) fault
A lamp fault detection during self-testing is resulting in the following faulty status :
- The signal LED is discontinuously flashing red (alternately : 4 times flashing with a 1 second period then off).
- Within every minute (longer cycles with fluorescent tubes and shorter ones with LED lamps) an ignition procedure is started to try to turn on the lamp.
- The mains operation is inhibited.
Important note for emergency lighting unit without integrated maintained operation (i.e. units without LED-converter for LED-lamps or without electronic ballast for fluorescent lamps) :
A lamp fault can only be detected during self-testing. Therefore it can happen that a lamp might be faulty under mains operation and at the same time that the signal LED might still be green. Using fluorescent tubes, this situation can happen more frequently due to the fact that fluorescent tubes are preheated only on one side under emergency operation and on both sides during mains operation. The fault status will be transmitted to the supervision unit.
Important note for emergency lighting unit with integrated maintained operation (i.e. units with LED-converter for LED-lamps or with electronic ballast for fluorescent lamps) :
A lamp fault can not only be detected during self-testing but also under maintained mode, as soon as or each time the mains the lamp is turned on. In both cases the unit has the same faulty status (as described above) and the same ignition procedure tries take place until the lamp is repaired or replaced. The fault status will be transmitted to the supervision unit.
Lamp fault clearing
Due to the fact that ignition tries are periodically started, this faulty condition will be reinitialised at most one minute after replacement or repair of the lamp. The new (or repaired) lamp will automatically turn on and the faulty condition reinitialised. After that the signal LED will be green again.
Important note:
- Contrary to battery fault conditions, the re-initialisation after lamp fault clearing is not considered as a new start of the emergency lighting. This means that the testing cycles will keep being performed in the existing sequence.
- The fault clearing condition will be transmitted to the supervision unit. Through the supervision unit it is possible to signalise this fault clearing status, to print it and to record it centrally, or to transmit it further.
System failure
If a self-testing cannot be fully performed and if no battery or lamp faults are detected before the interruption of the self-testing sequence, the electronic supervision unit will identify this problem as a system failure. The following status will happen :
- The signal LED will be turned off.
Important note:
- In this case, contrary to battery charging fault or lamp fault conditions, the mains operation will not be inhibited.
The fault status will be transmitted to the supervision unit. - System failure clearing
The system failure will automatically be cleared at the start of the next self-testing. If this self-testing is performed correctly, the signal LED will turn on green again. The fault clearing condition will be transmitted to the supervision unit. Through the supervision unit it is possible to signalise this fault clearing status, to print it and to record it centrally, or to transmit it further.
Important security notice
In case of mains failure occurring during a faulty condition, the emergency lighting unit will still try to turn on the lamp, whatever the faulty condition might be (lamp fault or battery capacity fault).
Audible Alarm for SRMMB types
SRMMB type units will produce an audible alarm for a few seconds every hour if the unit is faulty for any reason.
Signal LED
Summary of signal LED states and of the corresponding possible faulty conditions :
- off state: mains failure, battery fully discharged, system failure or faulty unit.
- continuously flashing red: battery charging fault (battery not connected) or battery capacity fault (battery capacity too low).
- discontinuously flashing red: lamp fault.
- green: everything ok.
MWeb
MWeb, supervision unit for SRM
Input devices
EAS-SRM is an input device providing two push buttons, 8 inputs for monitoring external circuits open/close state, 4 inputs for the AC mains presence detection, and 4 relays for controlling external devices. It can communicate with the MWEB controller on the SRM bus (non real-time) and/or over the RS-485 bus for real-time operation.
EAS2-SRM is an input device providing one connection for monitoring of the external open/close circuit state, and one input for the AC mains presence detection. It can communicate with the MWEB controller on the SRM bus (non real-time).
EAS4-SRM is an input device providing four connectors for monitoring external circuits open/close state, and two inputs for the AC mains presence detection. It can communicate with the MWEB controller on the SRM bus (non real-time) and/or over the RS-485 bus for real-time operation. The device will operate during power outages – backup battery inside.