Voltage Inputs - GE 469 Instruction Manual

CHAPTER 3: INSTALLATION
3.2.5

Voltage Inputs

469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
PHASE A CT
A
B
C
G6 H6
1A/5A COM
PHASE A
FIGURE 3–18: Summation Method with Phase CTs
FIGURE 3–19: Summation Method without Phase CTs (Phase CTs wiring is shown in Figure 3-12)
The 469 has three channels for AC voltage inputs, each with an isolating transformer. There
are no internal fuses or ground connections on the voltage inputs. The maximum VT ratio is
300.00:1. The two VT connections are open delta (see FIGURE 3–12: Typical Wiring Diagram
on page 3–11) or wye (see below). The voltage channels are connected in wye internally,
which means that the jumper shown on the delta-source connection of the typical wiring
diagram, between the phase B input and the 469 neutral terminal, must be installed for
open delta VTs.
PHASE A CT
PHASE B CT
MOTOR
PHASE C CT
G7 H7 G8 H8 G9 H9 G10 H10
1A/5A COM 1A/5A COM 1A/5A COM 50:.025 COM 1A/5A
PHASE B PHASE C GROUND GROUND
CURRENT INPUTS
DIFF.
DIFF.
PHASE B CT
DIFF.
PHASE C CT
G3 H3 G4 H4 G5 H5
COM 1A/5A COM 1A/5A COM
PHASE A PHASE B PHASE C
DIFFERENTIAL INPUTS
806846A3.DWG
3–17