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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
(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
Control Unit standard FT1020G3 (without printer)
Control Unit standard FT1020G3 (with printer)
Control Unit standard FT1020G3 (without front, printer, etc.)
Printer in standard FT1020G3
8 zones expansion board 4580 (PCB 2B)
8 zones expansion board 4580 (PCB 3A)
8 relays expansion board 4581
In & outputs expansion board 4583, no units connected
TLON connection board 5090
Web-server II 1598
The Control Unit current consumption shown above are measured during battery back-up
i.e. no mains.
Control unit – backup battery powered. COM loops and external equipment current consumption not included.
166
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.)
166
166
166
168
174
Technical/Programming Manual
FT1020G3 Rev 2.2.1
), in Normal state
DC
Normal state
Alarm state
(quiescent) (mA)
(active) (mA)
230
290
167
253
312
179
214
23
350
22.2
22.2
169
170
15
15
15
15
15
15
approx. 5
approx. 5
60
65
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