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6.
WIRING
6.1 Precautions
When wiring, consider the following items to avoid erroneous operation, damage or incorrect
usage to the inverter.
Cautions o n Wiring
(1)
Do not connect the power supply wires to the output terminals (U, V, W) 01 the inverter.
If they are connected to these terminals, it will damage the inverter.
(2)
Terminals P and PR are used for connection
01
the optional brake resistor (refer to
page 131). Never short circuit or connect anything other than the brake resistor across
these terminals.
(3) Use sleeved solderless terminals for the connection of the power supply and the motor.
(4) Common terminals SD,
5, and SE in the terminal block for the control circuit are not
at the same potential. Do not connect or ground these terminals.
(5)
Use only shielded or twisted caMes to connect the control circuits. These wires must
be routed as far as possible from the main power and AC relay logic circuits.
(6) During wiring, close the
slots on
the top of the inverter with a cover so that cut pieces
of
wire
will not
enter
the
inverter.
(7) If
modilkation of the wiring
OT
other work becomes necessary aiter operating the in-
verter, do not touch the wire or terminals until power is disconnect and the POWER
CHARGE indicating lamp is extinguished for at least two minutes.
(8) Any p e k o n who is involved in the wiring of this equipment should be fully competent
to carry out the work.
-
Wire Size and Wiring Distance
(1) If the motor is installed a long distance from the inverter, available motor torque will
be reduced due to voltage drop in the motor cable, especially when the motor is
operating at low frequencies. Select the wire size so that voltage drop is less than 2%.
(2) At extreme distances. the charging current generated due to floating capacity between
the wires may trigger the current limit function. To avoid this problem, the maximum
wiring distance should be limited to the values given in the following table. If the ap-
plication requires wiring longer than the permissible lirnlts, refer to page 55.
Note:
l m t w (m)
-
Appx. 3
feet
The total wiring length must be 500 m
(1641
feet) or less.
lnvener
500m
(1MI
feet)
or less
IM
lnvelter
3Wm
(984.6 feet)
+
3oom (984.6 feet)=6OCin (1969.2 1881)
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11
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