CHAPTER 3: INSTALLATION
WIRING
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
3-35
3
3.3.10
L60 channel communications
As described earlier in this chapter, L60 communication 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 scheme can be upgraded or changed at any time. The L60
channel interface requires an external battery to drive inputs and outputs. The module can be used with any battery
voltage. However, the battery voltage must be reflected in the
GROUPED ELEMENTS
SETTING GROUP 1(6)
PHASE
COMPARISON ELEMENTS
87PC SCHEME
87PC CH1(2) RX VOLT
settings, which define the acceptable voltage threshold
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 3-33: L60 to PLC connections for a two-terminal line