GE 8041-CC-35 Carrier extension cable, 0.35m
The ELFD Controller Carrier provides a mounting platform for up to
two SafetyNet Controllers (8851-LC-MT). It can also accommodate a
Power Supply Monitor module (8410-NS-PS) which can monitor the
health of up to two 8913-PS-AC, four 8914-PS-AC power supplies
and the 12V supply to Intrinsically Safe Modules (when these are
used). For each Controller there is a serial port connector and a
manually operated "“Change State” button. The Carrier also
provides terminals that are used when earth leakage fault detection
is required.
CARRIER SPECIFICATION
See also System Specification
CARRIER MOUNTING MODULES
SafetyNet Controller (x2) ......................................8851-LC-MT
Power Supply Monitor Module ..............................8410-NS-PS
ELECTRICAL CONNECTIONS
Railbus connector ........................................................male out
Serial port connectors........................9-pin, D-type (female) (x2)
Power Fail connections ........................screw terminals (x7 pairs)
Ground connection ..................................M4 screw terminal (x1)
BFP0V connection ....................................M4 screw terminal (x1)
Earth leakage fault detection connections
..................................................................screw terminals (1 pair)
System Power connections......................................6-Pin (male)
(Note: this does not provide power to the SafetyNet Controllers)
MECHANICAL
Dimensions ................................200 (w) x 253 (d) mm (footprint)
Height ..............................................28 mm (top of circuit board)
.............................................................................55 mm (overall)
Weight ..............................................................1.43 kg (approx.)
Mounting methods ......................................flat panel (4 fixings)
USER CONTROLS
Two “ change state” buttons, one for each SafetyNet Controller, are
provided on the carrier. The state change depends upon the
controller state before the button is pressed. See table below for
effects.
Controller Carrier
ELFD Controller Carrier 8751-CA-NS
State Effect
Master Change to standby if current standby is healthy
Standby Change to offline state
Backup Re-synchronise and return to standby

EARTH LEAKAGE FAULT DETECTION
SYSTEM POWER SUPPLY CONNECTIONS
Pin # Function
1 0V
2 NC
3 Tx/Rx (+)
4 Tx/Rx (+)
5 Tx/Rx (-)
6 Tx/Rx (-)
7 NC
8 NC
9 0V
Terminal External Power
1 No connection
2 0V
3 +12V
4 +12V
5 0V
6 No connection
Two pairs of System Power supply connections (terminals 2/3 and
terminals 4/5) are provided for wiring a redundant pair of 8913-PSAC power supplies.
Note: The Controllers do not draw their power from these
connections, they are supplied with Controller Power via connections
on the Controllers themselves.
The GND terminal must always be connected to the main instrument
earth or the ‘star-point’ bus-bar. (Note: the 0V of the 8913-PS-AC
power supplies is GND).
The BFP0V terminal must always be connected to 0V of the 8914-PSAC power supplies.
Controller Carrier
When earth leakage fault detection is NOT required, a link should be
made - as shown below - between the BFP0V and GND connection
studs. Note: the BFP0V connection stud must still be connected to
Bussed Field Power 0V, marked “-” on the 8914-PS-AC power supply,
and the GND connection must still be connected to ground.
When earth leakage fault detection IS required, then the terminals of
connector CON12 must be wired to a channel of an 8810-IO-DC
module - as shown below - that has been configured for earth
leakage. Note: earth leakage fault detection can only operate when
BFP0V and all field wiring and field instruments are isolated from
ground (GND).