Section 2: Installation
Overcurrent trouble
If the total current of the panel internal components and all outputs exceeds a threshold of 2.1 A for a period longer than 5 minutes, an
overcurrent trouble is generated. When the current goes below a 2.0 A threshold, the trouble restores. Do not exceed 2.0 A combined
between AUX and Corbus.
Note:
Total current does not include bell current or battery charging.
Line loss
Voltage loss through wire resistance must be considered for all installations. To ensure proper operation, at least 12.5 VDC must be
applied to all modules on the system (when AC is connected and the battery is fully charged). If less than 12.5 VDC is applied, system
operation is adversely affected.
To correct the problem, try any or all of the following:
1. Connect a HSM2300/2204/3350/3204CX power supply between the alarm controller and the module to provide additional power
to the Corbus.
2. Reduce the length of the Corbus run to the module.
3. Increase the gauge of wire.
Capacitance limits
An increase in capacitance on the Corbus affects data transmission and causes the system to slow down. Capacitance increases for
every foot of wire added to the Corbus. The capacitance rating of the wire used will determine the maximum length of the Corbus.
For example, 22 gauge, non-shielded, 4 conductor wire has a typical capacitance rating of 20 pF per foot (which is 20 nF/1000 ft). For
every 1000 feet of wire added – regardless of where it is run – the capacitance of the Corbus increases by 20 nF.
The following table indicates the total wire distance allowed for the capacitance rating of the wire used:
Table 2-3: Wire capacitance
Wire Capacitance per 1000 ft (300 m)
Total Corbus Wire Length
15 nF
5300 ft/1616 m
20 nF
4000 ft/1220 m
25 nF
3200 ft/976 m
30 nF
2666 ft/810 m
35 nF
2280 ft/693 m
40 nF
2000 ft/608 m
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