Incite Fire FIREscape, Руководство по установке

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FIREscape System Installation Manual
Page 46 of 56
16.5 Other Devices
The
minimum operating voltage of the control panel’s voltage outputs is 10.0 V.
When supplying external devices from the EL-2 Control Panel power supply, note the minimum operating
voltage of the devices and their maximum power consumption.
Also the position of the devices on the cable is important: are the devices equally distributed throughout the
length of the cable or only at the end of the cable?
Estimate the cabling requirement by checking the minimum operating voltages of the devices. Try to locate
the device that requires the greatest voltage at the beginning of the cable. If the cable has devices operating
at different minimum operating voltages, the cabling can be calculated by estimating each device separately.
However, you need to know the total power consumption of the cable.
The cable type is MHS (188
Ω/km).
Example 1
2 pcs EL-KP, maximum
current requirement 60 mA,
minimum operating voltage
8 V.
Distance to the first EL-KP keypad
is 50 m. Distance to the last EL-KP keypad
is 200 m.
The current in the cable between the device x, EL-KP 1, and the control panel is a maximum of 60
+ 60 mA = 120 mA. The voltage requirement is 8 V.
Figure 25
The graph shown in Figure 29 on page 42 indicates that one conductor pair can supply the voltage to the
keypad.