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Amended: Jan 2014
Locating a fault on a loop
If the fault is a short circuit middle or a open circuit on the loop the check auto-config function can be
used. This is in the supervisor level on the others section of the display. When this function is used
the panel will go round the loop from the start until it cannot communicate with a device it will then
show an open circuit at an address, this will help locate a short/open circuit in the middle of a loop. If
check auto-config shows a fault at the end of the loop but no short or open can be found, the problem
may be a resetting detector, see 'loop voltage drop' above in “Open circuit” Positive/Negative section
above. Alternatively run the Intermittent fault search in the high level menu.
If an address is suspected as been faulty or dual addressed the test device function can be used to
locate the device. Test device is in the engineer level under testing. When a device is put into test its
LED should light up, two will light up if both devices have the same address. If the tested device is a
sounder it will sound continuous. Sometimes the faulty device will not respond if this is the case test
the device before the faulty one and the one after the faulty one to help locate the exact device.
