Oldham SharpEye NP40IGB, Руководство пользователя, Страница: 19 / 50

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1.6.2.1 How the BIT Operates
•
The detector's status remains unchanged if the result of a BIT is the same as the
current status (NORMAL or BIT Fault)
•
the detectors’ status is changed (from Normal to BIT Fault or vice versa) if the BIT
differs from the current status
Note: In ‘BIT Fault’ status the detector can continue to detect a fire.
1.6.2.2 Automatic BIT
The detector automatically performs a BIT every 15 minutes. A successful BIT sequence
does not activate any indicator.
The results of a successful and unsuccessful BIT are listed in
Table 10 and
Table 11.
Table 10: Results of a Successful BIT
Output Result
Fault relay
•
Model 1XXX, 2XXX, 4XXX Wiring options 1, 2, 4:
remains CLOSED
•
Model 3XXX, 5XXX Wiring options 3 and 5: remains
OPEN
0-20mA output Wiring option 1, 2, 3: Normal (5 mA)
Power LED Green, Flashing, 1 Hz On (Normal)
Table 11: Results of an Unsuccessful BIT
Output Result
Fault relay
•
Wiring option 1, 2, 4: changes to Open
•
Wiring option 3 and 5: changes to Closed
0-20mA output Wiring option 1, 2, 3: BIT Fault (2mA)
Power LED Yellow, Flashing, 4 Hz
BIT procedure Performed every 1 minute
1.6.2.3 Manual BIT
The BIT is manually initiated by momentarily connecting Terminal 3 with Terminal 2 (or
a switch across these terminals in the safe area).
If the BIT is unsuccessful, all outputs will function as described for Automatic BIT, but
the BIT is now automatically executed every 1 minute. This continues until a successful
BIT occurs, when the detector will resume normal operation.
The results of a successful and unsuccessful Manual BIT are listed in Table 12 and Table
13.