Programming Ground Fault Monitoring - Siemens FC700A Hardware Description

Ground fault monitoring (FM compliance)
6.2

Programming ground fault monitoring

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