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All smoke detectors of the smoke detection panel or extension unit indicate
Please disconnect the wires at terminal nos. 31/32 at the detector interface module. If
the alarm indication is still present, the detector interface module is defective and must
be exchanged. If the alarm is not displayed after disconnection of the wires, a short
circuit in the smoke detector line including the zener barrier is probable. Disconnect
the zener barrier and measure the resistance between 5 and 8. If a short circuit will be
indicated, the zener barrier must be replaced. If no short circuit has been found in the
zener barrier, the short circuit must be located in the wiring of the smoke detectors.
Please note, that all smoke detectors are connected in one line. Remove all smoke
detectors in this panel. No short circuit may be measured between terminal no.1/3 or
between terminal no.1 and enclosure or between terminal no.3 and enclosure.
Note:
• For setting of rotary switches please also refer to drawing nos. SDS01.100.80 -
SDS01.100.88.
• Changing of rotary switches will not be valid before power down and restart of the
smoke detection system.
Fault Finding Instructions SDS26
"FIRE", but no smoke is present
16.06.09
safetec
Seite 10 von 13
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