N700 Operating Instructions and Parts Manual
2. Installation and Wiring
15
(3) Applicable
Tools
Refer to the “Table 2-7 Common Application Tools” on page 16.
(Note1) The applicable tools indicate for standard four-pole squirrel-cage
Motor.
(Note2) Select applicable tools for breakers examining the capacity of
breakers.(Use Inverter type.)
(Note3) Power lines should be used a heavier gauge wire, if the distance
exceeds 20m.
(Note4) Use earth-leakage breakers (ELB) for safety.
Separate by the sum(wiring distance from Inverter to power supply, from
inverter to motor for the sensitive current of leak breaker (ELB).
Wiring distance
Sensitive Current(mA)
100m and less
50
300m and less
100
Table 2- 5 Sensitive current according to wiring distance
(Note5) Use
0.75mm
2
for AL Relay and RN Relay.
(Note6) When using CV line and wiring by rigid metal conduit, leak flows.
(Note7) IV line is high dielectric constant. So the current increase 8 times.
Therefore, use the sensitive current 8 times as large as that of the left list. And if
the distance of wire is over 100m, use CV line.
Name
Function
(1)
Input reactor
(harmonic control,
electrical coordination,
power-factor
improvement)
This part is used when the unbalance voltage rate is 3% or more
and power supply is 500 kVA or more, and there is a rapid
change in the power supply. It also improves the power factor.
(2)
Radio noise filter
(zero-phase reactor)
Using the inverter may cause noise on the peripheral radio
through the power lines.
This part reduces noise.
(3) Noise filter for Inverter
This part reduces common noise generated between the power
supply and the ground, as well as normal noise. Put it in the
primary side of inverter.
(4)
Input radio noise filter
(capacitor filter)
This part reduces radiation noise emitted from wire at the input.
(5) Direct reactor
This part control harmonic from inverter.
(6)
Breaking resistor
Regenerative breaking
unit
This part is used for applications that need to increase the brake
torque of the inverter or to frequently turn on and off and to run
high inertia load.
(7) Output noise filter
This part reduces radiation noise emitted from wire by setting
between inverter and motor. And it reduces wave fault to radio
and TV, it is used for preventing malfunction of sensor and
measuring instruments.
(8)
Radio noise filter(zero-
phase reactor
This part reduces noise generated at the output of the inverter.
(It is possible to use for both input and output.)
Output alternation reactor
Reducing vibration,
thermal
Relay, preventing
Misapplication
Running motors with the inverter generates vibration greater
than that with commercial power supply. This part installed
between the inverter and motor reduces torque ripple. When the
cable length between the inverter and motor is long (10m or
more), a countermeasure for a malfunction of the thermal relay
by harmonic due to switching on inverter is taken by inserting
reactor.
There is the way to use current sensor in stead of thermal relay.
(9)
LCR filter
Sine-wave filter at the output.
Table 2- 6 Optional accessories for improved performance
MCCB
MC
INVERTER
R
S
T
U
V
W
Motor
Three phase
Power supply
PD
P
N
RB
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)