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Ground fault monitoring (FM compliance)
22
Siemens Building Technologies
007831_a_en_--.doc
Fire & Security Products
03.2004
6.2
Programming ground fault monitoring
E3I040
X30
3)
I-Bus
Ground fault monitoring active,
detected at the E3G070
LON-Bus
E3G...
E3L...
E3I020
RS232
Galvanically isolated circuits
Control unit
Ground fault monitoring 'control unit' (jumper 'X60') may only
be active
within an electrically connected C-Bus network.
(preferably always in the station with C-Bus address 1)
once
1)
The C-Bus potential shall only be allocated to system
ground in
(jumper 'X30').
(preferably always in the station with C-Bus address 1)
one station
The jumper
be inserted at each LON-Bus
module so that the ground faultmonitoring
'LON-Bus' is active.
must
J1
J2
X30
X60
1)
2)
C-Bus
I-Bus
J1
J2
X30
FC
FT
FT
I-Bus
Stations which have their own power supply and
which are
linked together by the emergency
operation circuit are regarded as separate circuits
with their own ground fault monitoring.
The jumper 'X60' must be inserted
.
not
at each station
- Outgoing lines which are activated by galvanically isolated contacts cannot influence the control unit in the event of
ground fault, and therefore, they don't nead to be monitered!
- If a connection is security-relevant, and an
interface is being used, be sure to make an optical link.
- If galvanically isolated relays are used, make sure that the 3rd party system takes over the ground fault monitoring
function.
-
reacts if the resistance is:
a) 4k from positive potential to ground, or
b) 16k from negative potential (system ground) to ground
RS232
Ground fault monitoring
≤ Ω
Ω
≤
J1
J2
X30
X60
1)
2)
I-Bus
J1
J2
X30
FC
C-Bus
LON-Bus
Rs232 interface
monitored
not monitored
2)
2)
2)
1)
2)
E3G070
B3Q700
B3Q700
B3Q700
B3Q700
E3G070
FC
FC
B3Q700
X60
1)
E3G070
I-Bus
C-Bus
B3Q700
E3G070
J1
J2
X30
B3Q700
FT
2)
2)
Emergency
operation
circuit
2)
3)
J2
J1
X30
J2
J1
X30
X60
Emergency operation circuit