Brooks Firetracker FT128 CIE - 24 Current Consumption; Table 17 FT128 and CIE Options Current Consumption

Technical / Programming Manual
FT128 Rev 2.2
168
24 Current Consumption
An Excel spread sheet is available from Brooks Australia to calculate the total current
consumption of the CIE and the battery capacity required. The spread sheet will return
your expected current consumption, cable length, battery capacity etc. based on the COM
loop cable resistance (Ω/km) and the specific units expected to be connected to the COM
loop.
The loop units have different current consumption. Note that some units have much higher
current consumption in "active state" than in normal state. The tables below can be used:
 To get a total current consumption overview.
 To check the current consumption on the COM loop in relation to the cable length,
etc. See drawing F784-01, F784-02 and chapter “FT128 cable length calculation”
page 164.
 To check if the battery capacity is sufficient.
The current consumption is normally shown at nominal voltage (24 V
DC
) in Normal state
(quiescent) and in Alarm state (active). When the mains fail, the voltage of the battery
back-up can be 21– 27 V
DC
156
.
See also Section “Power Supply”, page 171.
Table 17 FT128 and CIE Options Current Consumption
CIE Units
Normal State
(quiescent) (mA)
Alarm State
(active) (mA)
Control unit FT128 (backlight off/on)
157
51/109
67/125
8 zones expansion board 4580 (PCB 2B)
158
22.2
22.2
8 zones expansion board 4580 (PCB 3A)
159
15
15
8 relays expansion board 4581
15
15
Inputs / outputs expansion board 4583, no units connected
15
15
RS485 transceiver (communication module for display
units) 4552
14
14
Web-server 1598
60
65
The Control Unit current consumption shown above are measured using only backup
batteries i.e. no mains.
156
However, there will be a voltage in the system down to a battery voltage of approx. 15 V before it switches off in order to avoid
damaging the batteries.
157
Control unit only, i.e. the COM loop units' current consumption and other connected external equipment's current consumption
are not included.
158
Add 3.5 mA (quiescent) and 12 mA (activated) respectively, for each Zone Line Input used.
159
Add 0.5 mA per input (zone) for end-of-line capacitor (470nF) and 3 mA per input (zone) for end-of-line resistor (10K).
Add 30 mA per input (zone) activated. (Each input has a 30 mA current limitation, i.e. also for short-circuit on the line.)