6.
WIRING
-
Items
to
60
Checked
when
Designing an
Application
(1)
If
the application
has
a commercial power
supply selector circuit as shown in the illustra-
tion
to
the right, accidental connection of line
power
to
IIM
inverter
output
terminals will
Power
JjTFbF
damage the inverter.
To
avoid
this
problem, in-
*'
*__._______.
terlock
MC1
and
MC2
both
electrically and
mechanically.
(2)
At an occurrence
01
power interruption, il the start signal (start
switch)
is
retained
ON
with the frequency instruction retained, the inverter will restart automaticaliy when
power is restored.
It
restarting
of
the
inverter is not desired on
poww
restoration,
it
is
necessary to install a
magnetic
contactor
(MC)
at
the primary
side
of
the
inverter as
well as
to
design
a
control sequence
that
disables the
s@rt
signal.
(3)
Low level signals are used in
the
control circuit.
Use
dry contacts,
hwo
contacts ar-
ranged in parallel, or a twincontact
to
prevent defective wntecting.
(4)
Do
not input voltage to contact input terminals
(STF,
for example)
of
the
control circuit,
(5)
Do
not
apply
voltage directty to the
alarm
output
signal
terminals (A,
8,
C)
without
a
relay
coil or lamp.
(6)
If,
according to the ap@cation, an open collector output
such
as
an
output
from a
programmable controller is connected directly
to
the
inverter input terminal, use ter-
minal
PC
(external transistor common).
Acddaal
connection
IWMieI
How
to
u.0
trnnirui
PC
Connect the external power supply common for tramistor output signals
to
terminal
PC
to prevent malfunctioning due
to
undesirable current.
Note:
For type
AY40
unit,
it
is necessary to install
24
VDC
power
suppiy.
-12-
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