Hitachi SJ Series, User Manual

Page: 81 / 786

7-26
Chapter 7
Wire Connection and Optional Devices
7.7.2 Wiring to the Control Circuit Terminal
Block
Points to be noted on wiring the control
circuit terminals
・
L, COM, and CM2 are common terminals
for input and output signals, and they are
insulated from one another. Do not make
these common terminals shorted or
grounded.
・
Do not make them grounded via an
external device.
・
Separate the wiring to the control circuit
terminal block from that of the main
circuit line (power line) or relay control
circuit. If it is unavoidable to do so,
make them positioned at right angles to
each other. Otherwise, the inverter may
malfunction.
・
Although the control circuit terminal
block has two lines, you can easily
perform wiring by starting from the lower
terminals. Make setting to perform
wiring from the lower area.
・
When wiring between Ai1 and L and
between Ai2 and L, make sure to check
that the positions of the corresponding
DIP switches SW1 and SW2 are at the
desired input (voltage or current).
・
Input of erroneous voltage or current
caused by erroneous selection of switch
or input of a value outside the
specification range (using P24 terminal
(24V) instead of H terminal (10V)),
incorrect wiring (wires are installed in
reverse
orientation and input of
voltage/current is reversed, short circuit
occurs between H and L, wiring of a
knob causes short circuit between H
and L at 0
Ω , etc.) may cause failure.
・
For wiring to the control circuit terminal
block, use twisted shield wires, and
connect the shield films to each
common terminal.
・
The wiring length to the control circuit
terminal block shall be within 20m. If the
connecting wire exceeds 20m, you may
not
be able to get sufficient
characteristics due to effects of voltage
drop. If it is unavoidable to set the
length to more than 20m, use an analog
insulation signal converter, and check
that there is no problem with operation.
・
After wiring, lightly pull the wires to
check that wires are securely
connected.
・
For output terminals and relay output
terminals, install a diode for preventing
counter-electromotive force.
・
Otherwise, counter-electromotive force
is applied, which may cause failure.
Mal-
functioning
Do
Electric
shock
Failure
Prohibited
Do
Do
Mal-
functioning
Mal-
functioning
Do
Mal-
functioning
Do
Prohibited
Failure
Do
Failure
Do