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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
I I M
inverter
output
terminals will
Power
J j T F b F
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. I t 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 t h e inverter input terminal, use ter-
minal PC (external transistor common).
A c d d a a l connection
I W M i e I
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.
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