Monitored Control Outputs - Siemens XC1001-A Installation And Maintenance Manual

Connections
7.6

Monitored control outputs

36
Building Technologies
Fire Safety
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
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)
) in order to make sure that device
SYS MAX
A6V10257473_e_en_--
2015-03-04