GE 269Plus

2- 30 269Plus Motor Management Relay GE Power Management
METER OPTION INSTALLATION 2 INSTALLATION
2
d) VT INPUTS (1-4)
The MPM can accept input voltages from 0 to 600 V AC between the voltage inputs (V
1
,V
2
,V
3
) and voltage
common (V
n
). These inputs can be directly connected or supplied via external VTs. If voltages greater than
600 V AC are to be measured, external VTs are required. When measuring line to line quantities using inputs
V
1
,V
2
and V
3
, ensure that the voltage common input V
n
is grounded. This input is used as a reference for
measuring the voltage inputs.
All connections to the MPM voltage inputs should be connected using HRC fuses with a 2 A
rating to ensure adequate interrupting capacity.
e) CT INPUTS (9-20)
5 A or 1 A current transformer secondaries can be used with the MPM for phase and neutral sensing. Each
current input has 3 terminals: 5 A input, 1 A input, and common. Select either the 1 A or 5 A terminal and com-
mon to match the phase CT secondary. Correct polarity as indicated in the wiring diagrams shown in Figures
2–22: MPM TO 269 PLUS TYPICAL WIRING (4-WIRE WYE, 3 VTs) through 2–25: MPM TO 269 PLUS TYPI-
CAL WIRING (2 CT) on pages 2–33 to 2–36 is essential for correct measurement of all power quantities.
CTs should be selected to be capable of supplying the required current to the total secondary load which
includes the MPM relay burden of 0.2 VA at rated secondary current and the connection wiring burden.
WARNING