3.2.10 L60 CHANNEL COMMUNICATIONS
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
SETTING GROUP 1(6)
settings, which define the acceptable voltage threshold
87PC CH1(2) RX VOLT
received from the PLC. The L60 communications outputs are MOSFETs and inputs are implemented with optocouplers,
excluding any galvanic connection between PLC connections and the relay boards.
Figure 3–26: L60 TO PLC CONNECTIONS FOR A TWO-TERMINAL LINE
L60 Line Phase Comparison System