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23
AC Input (NT2000M)
These are the power supply input terminals for running the NT2000M.
MCCB
100 to 240 VAC
50/60 Hz
Insulated
transformer
NT2000M Power Supply Wiring
•
Provide a 100 to 240 VAC power.
•
Use a power supply within the allowable voltage range.
Power supply voltage
Allowable voltage range
100 to 240 VAC
85 to 264 VAC
•
Insulated Transformer
The NT2000M has built-in anti-noise features which are sufficient for handl-
ing general noise from power lines, but ground noise can be greatly re-
duced by supplying power through a 1:1 insulated transformer. The second-
ary side of the insulated transformer should be an isolated neutral system.
•
Power Capacity
Use a rated power supply of at least 50 VA.
•
If power lines are long, then use wires of at least 2 mm
2
to avoid a drop in
voltage.
•
Use twisted-pair cables.
2-5-3
LG and GR Terminals
HOST
RUN
INPUT
ALARM
OUTPUT
100 to 240 VAC
50/60 Hz
LG
GR
Terminal screws are M4.
•
GR is the ground terminal. In order to avoid electric shock, use separate
ground wire (at least 2 mm
2
) and a class-3 ground (ground resistance
100
W
or less).
•
LG is the noise filter neutral terminal. If malfunction results from excessive
noise, or to prevent electrical shock, short-circuit LG and GR and use a
class-3 dedicated ground.
•
The ground line should be 20 m or less.
Wiring and Connectors
Section 2-5