*These units draw current from the Corbus to power devices external to the module. This current
must be added to the total Corbus current. See manufacturer's specifications for the current draw
of each device.
** For HSM2955 current draw refer to HSM2955 installation manual.
Line Loss
Voltage loss through wire resistance must be considered for all installations. To ensure proper
operation, at least 12.5Vdc must be applied to all modules on the system (when AC is connected
and the battery is fully charged). If less than 12.5Vdc is applied, system operation is adversely
affected.
To correct the problem, try any or all of the following:
1. Connect a PowerSeries Neo 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
picofarads per foot (which is 20nF/1000’). For every 1000' of wire added – regardless of where it is
run – the capacitance of the Corbus increases by 20nF.
The following table indicates the total wire distance allowed for the capacitance rating of the wire
used:
Table 5: Wire Capacitance
Wire Capacitance per 1000’ (300m)
Total Corbus Wire Length
15nF
5300’/1616m
20nF
4000’/1220m
25nF
3200’/976m
30nF
2666’/810m
35nF
2280’/693m
40nF
2000’/608m
Installing Modules
Remove all power from the system while connecting modules to the alarm controller.
Zone Expander
The main alarm controller has connection terminals for zones 1 to 8. Additional HSM2108 zone
expanders may be added to increase the number of zones on the system. Each zone expander
consists of one group of 8 zones. At enrollment, the zone expander is automatically assigned to the
next available zone slot. Connect the RED, BLK, YEL and GRN terminals to the Corbus terminals on
the alarm panel. Board current draw: 30mA.
27
PowerSeries Neo HS2016/HS2016-4/HS3032/HS2064/HS2064 E/HS2128/HS2129 E Alarm Controller Reference
Manual