Technical/Programming Manual
FT1020G3 Rev 2.2.1
174
27
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 a COM
loop.
The loop units have different current consumption. Note that some units have much higher
current consumption in "active state" than normal state. The tables below can be used:
To get a total current consumption overview.
To check the current consumption on a COM loop in relation to the cable length,
etc. See drawing F733 and chapter "FT1020G3 cable length" page 170.
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 27
– 21 V DC.
See also chapter "Power supply", page 177.
Table 16 FT1020G3 and CIE options current consumption
CIE units
Normal state
(quiescent) (mA)
Alarm state
(active) (mA)
Control Unit standard FT1020G3 (
without
printer)
166
230
290
Control Unit standard FT1020G3 (
with
printer)
253
312
167
Control Unit standard FT1020G3 (without front, printer, etc.)
179
214
Printer in standard FT1020G3
23
350
8 zones expansion board 4580 (PCB 2B)
168
22.2
22.2
8 zones expansion board 4580 (PCB 3A)
15
169
15
170
8 relays expansion board 4581
15
15
In & outputs expansion board 4583, no units connected
15
15
TLON connection board 5090
approx. 5
approx. 5
Web-server II 1598
60
65
The Control Unit current consumption shown above are measured during battery back-up
i.e. no mains.
166
Control unit
– backup battery powered. COM loops and external equipment current consumption not included.
167
When the printer is active the current consumption is 667 mA momentarily.
168
Add 3.5 mA (quiescent) and 12 mA (activated) respectively, for each zone line input used.
169
Add 0.5 mA per input (zone) for end-of-line capacitor (470 nF) and 3 mA per input for end-of-line resistor (10K).
170
Add 30 mA per input (zone) activated. (Each input has a 30 mA current limitation, i.e. also for short-circuit on the line.)