Siemens FS720 - Page 77

Mounting and installing extinguishing control panels
Extinguishing terminal installation and wiring
6
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248
Building Technologies
A6V10210390_m_en_
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Fire Safety
2018
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08
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6.4.2.4 Extinguishing terminal wiring
Figure 42: Wiring diagram of the primary and secondary extinguishing terminals
Primary terminal
● A maximum of 1 primary terminal may be connected; the address must always
be '1'
● The maximum cable length for the primary terminal is 10 m; twisted and
unshielded cable with min. 7 twists/meter.
The polarity must be observed (A, B) whe
n connecting the data cable.
Secondary terminal
1) The maximum length of the stubs is 20 m for the secondary terminal
2) The line must be terminated at the furthest terminal with 120 Ω (secondary
terminals only)
3) An external power supply, e.g., FP120, is required for long lines or when if back-
up batteries are used.
● The address must always be ≥2; a maximum of 5 secondary terminals must be
connected for each extinguishing card.
● The maximum cable length for the secondary terminal is 1200 m; twisted and
unshielded cable with min. 7 twists/meter.
When using shielded cables, the shielding must be connected on the terminal
side.
● The cable resistance and the capacity is max. 80 Ω (on both sides) and max.
200 nF.
1
2
5
6
-
TERM_INT_VSYS+
3
4
7
8
+
TERM_INT_VSYS-
TERM_INT_DATA_A
TERM_INT_DATA_B
A
B
TERM_EXT_VSYS+
TERM_EXT_VSYS-
TERM_EXT_DATA_A
TERM_EXT_DATA_B
A
B
Cardcage FCA2046
X10
-
+
Primary terminal
X2
1,2
3,4
-
+
1,2
3,4
A
B
VSYS_POS
VSYS_NEG
X1
DATA_A
DATA_B
Secondary terminal
X2
1,2
3,4
-
+
1,2
3,4
A
B
VSYS_POS
VSYS_NEG
X1
DATA_A
DATA_B
5
6
#MAINS
#BATTERY
Optional
Terminal
Power
Supply
1
2
3