Connections
36
Building Technologies A6V10257473_e_en_--
Fire Safety 2015-03-04
7.6 Monitored control outputs
Five monitored control outputs are available on terminal blocks X7, X6 and X5 for
the connection of various devices.
Technical data for control outputs 1 to 3
- activation by reverse polarity (polarities indicated are “activated” polarities,
according to connected device, a diode can be necessary)
- line monitoring: 3.3 kΩ resistance connected at the end of the line
- protection: 1 AT fuse (F4 / F5 / F6)
Technical data for control outputs 4 and 5
- activation polarity is not reversed
- line monitoring: by calibration, within a range between 1 and 900 Ω
- protection: 2 AF fuse (F1 / F2)
Technical data common to the 5 control outputs
The maximum number of devices per output is determined by calculation, in 2
steps (see example below), depending on:
- minimum/maximum XC10 operating voltage = 22.5 V / 27.6 V
- nominal current consumption per device (@24V, see device technical data’s)
- minimum device operating voltage (see device technical data’s)
- protection fuse rating = 1 A or 2 A
- cable resistance (2x1.5 mm2 = 24.2 Ω / km, 2x2.5 mm2 = 14.8 Ω / km)
Calculation example for a device consuming 0.35 A at 24 V and having a
minimum operating voltage of 17 V:
1. From maximum system voltage (V
SYS MAX
) in order to make sure that device
consumption does not exceed fuse rating.
- Device current consumption at Vsys max = (27.6 x 0.35) ÷ 24 = 0.402 A
- Maximum number of devices: 0.402 A x n ≤ 1 A or 2 A
=> n ≤ 1 ÷ 0.402 ≤ 2.48, i.e. 2 devices (outputs 1 to 3)
=> n ≤ 2 ÷ 0.402 ≤ 4.96, i.e. 4 devices (outputs 4 and 5)
2. From minimum system voltage (Vsys min) in order to make sure, that in spite of
the cable resistance voltage drop, device minimum operation voltage is
respected:
- Device consumption at Vsys min = (17 x 0.35) ÷ 24 = 0.248 A
- Maximum voltage drop = 22.5 - 17 = 5.5 V
- Maximum line resistance (outputs 1 to 3) = 5.5 ÷ (0.248 x 2) = 11.08 Ω
- Maximum line resistance (outputs 4 and 5) = 5.5 ÷ (0.248 x 4) = 5.54 Ω
- Maximum line length (1.5 mm2) = (11.08 x 1000) ÷ 24.2 = 456 meters (outputs
1 to 3), = (5.54 x 1000) ÷ 24.2 = 228 meters (outputs 4 and 5)
- Maximum line length (2.5 mm2) = (11.08 x 1000) ÷ 14.8 = 748 meters (outputs
1 to 3), = (5.54 x 1000) ÷ 14.8 = 374 meters (outputs 4 and 5)
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