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5. LOADING AND INSTALLATION
MELSEC-A
(3) 24 VDC wiring notes
When a servo drive unit has a
built-in power supply
of 24 VDC,
a
wraparound circuit is made by the state of
a
power supply. A malfunction
will occur
if
a separate power supply is supplied externally. Therefore,
do not use the built-in power supply and external power supply together.
[Wraparound circuit]
I
1
I
I
External power
I
T
I
r--"--------'----
r " ' - - - - - - - - - - - - - - - -
1
I
I
I
I
I
I
I
r - + - - - -
I
-
"
E2
; [
I
I
I I
I
I
:<
supply
I
i !
. I - - - - - - - + - - - - -
--*---,
-------------
I
A
I
I
I
I
I
-
I
T
I
E l > E2
Even
if
the pulse output of AlSD71 is OFF, the power supply flows in a
servo unit pulse input line.
5-3
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