L60 Channel Communications - GE L60 Instruction Manual

3 HARDWARE
As described earlier in this chapter, L60 communications channels reside on the special CT/VT module (type 8P). This
module allows for all possible 87PC scheme combinations (such as dual phase comparison or single-phase comparison,
two-terminal or three-terminal applications) in one module. The customer can upgrade or change the scheme at any time.
The L60 channel interface requires an external battery to drive inputs and outputs. The module can be used with any bat-
tery voltage. However, the battery voltage must be reflected in the
87PC SCHEME 87PC CH1(2) RX VOLT
The L60 communications outputs are MOSFETs and inputs are implemented with optocouplers, excluding any galvanic
connection between PLC connections and the relay boards.
L60 Comms 1
Single-phase
Comparison
L60 Comms 2
Dual-phase
Comparison
Figure 3–24: L60 TO PLC CONNECTIONS FOR A TWO-TERMINAL LINE
The communications circuitry has the following characteristics for the transmitter and receiver.
Transmitter characteristics:
Operating voltage range: 0 to 300 V DC (typical points: 15 V, 48 V, 125 V, 250 V)
Output current limitation: 100 mA (maximum), 30 mA (nominal)
Receiver characteristics:
Input voltage range: 0 to 300 V DC
Input impedance: 25 kΩ
Input current: 10 mA at 250 V, 5 mA at 125 V, 2 mA at 48 V
GE Multilin
CONTROL ELEMENTS
settings, which define the acceptable voltage threshold received from the PLC.
L60
Tx Positive Ch 1
Tx1P ~ 5c
BATT+ ~
5b
Tx1N ~
5a
Rx Positive Ch 1
Rx1P ~ 6c
BATT- ~ 6b
Rx1N
~ 6a
~ 7c
Tx2P
BATT+
~ 7b
Tx2N
~ 7a
~
Rx2P 8c
~ 8b
BATT-
Rx2N ~
8a
L60
Tx Positive Ch 1
~
Tx1P 5c
Common (+) Ch 1
BATT+
~
5b
Tx Negative Ch 1
Tx1N
~
5a
Rx Positive Ch 1
Rx1P ~ 6c
Common (-) Ch 1
BATT- ~ 6b
Rx Negative Ch 1
Rx1N
~ 6a
Tx2P ~ 7c
BATT+ ~ 7b
Tx2N ~
7a
Rx2P ~
8c
BATT- ~ 8b
Rx2N
~ 8a
L60 Line Phase Comparison Relay

3.2.10 L60 CHANNEL COMMUNICATIONS

PHASE COMPARISON ELEMENTS
PLC
STATION
BATTERY
PLC
STATION
BATTERY
831784A1.CDR
3.2 WIRING
3
3-23