Omron K7GE-MG User Manual page 62

3 Installation and Wiring
Voltage Input Terminals
Connected between the load
wires of the secondary output
terminal of the contactor.
The S-phase in a 3-phase
system, and the N-phase in a
single-phase system is connected
to the L2 terminal (No. 3).
The R-phase in a 3-phase
system, and the L-phase in a
single-phase system is connected
to the L3 terminal (No. 1).
Discharge of electric charge and
application of the Megger voltage is performed at the L3 terminal.
If the internal circuit components of the K7GE-MG are in a normal state, a current of 3 mA or more will
not flow in the L2 and L3 terminals. However, to prevent electric shock accidents due to a short circuit
failure of the internal circuit components, be sure to insert a fuse in the L2 and L3 terminals.
Select a fast-blow fuse with a fusing current of 2 A or less, and a rated voltage equal to or more than the
line voltage. If a fuse with a fusing current of more than 2 A is used, ensure that the wire connected to
the PE terminal has a diameter that allows a sufficient flow of the fusing current.
3 - 12
K7GE-MG
MC
Fuse
L2
3
Fuse
L3
1
M
PE
7
Note The above diagram shows only the parts of the internal circuit of the
K7GE-MG that are necessary for explanation.
Insulation Resistance Monitoring Device User's Manual (N224)
Probe Unit
Voltage monitoring
2 MΩ Typ.
Peak
detection
2 MΩ Typ.
Current
Megger voltage
limiter
(50 VDC)
Main Unit