BSD-340-user-guide-eng, Doc. 1004474-2, 2020-09-18,
Autronica Fire and Security AS
Page 7
3. A detector has restarted, in which case it opens its loop switch and sends a Restart
message
Due to the electric properties and signalling type of the PowerLoop, the only way BSD-340 can
investigate and repair such problems is to power down the loop and raise it again. This is very
different from AL_Com loops, where AutroSafe can do all sorts of “troubleshooting” while the
loop is in normal operation. The AutroSafe will indicate ‘loop disabled’ during any loop raises
initiated by the system after a fault is detected.
2.2.3 Loop wiring
Due to the high current consumed by the loop units on a PowerLoop, it is vital that the wiring
length is checked with the PowerLoop Calculator in the Autrosafe Configuration Tool. This tool
ensures that the power loss in the cables does not exceed the operational parameters of the loop.
The system is designed to have BSD_340 PowerLoop Drivers distributed around the site, using
AutroFieldBus communication (maximum 1000+ meters cable length). BSD-340 PowerLoop
Drivers should be located as close to the connected loop as possible to reduce cable length.
Because of radio communication, whenever more than one BSD-340 is mounted together in a
cabinet, and loops are wired together, the system is more likely to have crosstalk issues (see
chapter 2.4).
2.3 Loop handling
2.3.1 Reporting topology to AutroSafe
During AutroSafe INIT the PowerLoop handling goes like this:
• Phase 1 of AutroSafe INIT: BSD-340 power-up/close-switch raise of its PowerLoop. This
takes approx. 50 seconds for a 15-unit loop.
Note! The BSD-340 knows how many detectors there are on the loop (see chapter 2.2.2
above). This means that after commissioning procedure has been run loop-by-loop, later
INITs will have much greater chance to succeed even with a lot of crosstalk.
• Phase 2 of AutroSafe INIT: BSD-340 reports the PowerLoop to the panel.
Note! If there are any missing detectors on the loop, the BSD-340 will first report the whole loop
topology to the panel. Next, the BSD-340 will report the missing detector. Timing between these
two reports is so short that the operator will immediately get the report of a missing detector on
the loop.
• Phase 3 AutroSafe INIT: When AutroSafe sends parameters to detectors, BSD-340 is
transparent to these messages.
2.3.2 Loop handling / RESET
As described in chapter 2.2.2, BSD-340 must use loop raise to evaluate and/or fix fault situations.
If BSD-340 detects a loop problem, it sends a RESTART message for itself to AutroSafe. AutroSafe
then executes general LoopDriver handling, which is:
1. Send a message to BSD-340 to power down the loop.
The loop is marked Disabled in the panel.
A disabled loop is not polled.
2. Send a message to BSD-340 to power up the loop.
At this point, BSD-340 does the power-up/close-switch sequence (see chapter 2.3.1).
When finished, it sends an “answer” to the power command back to AutroSafe.
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