I.
.I
,
APPENDKES
/MELSEC=-
APPENDIX
3
System
Design Considerations
On switching on
the
PC
power supply there
is
a
short but finite time
before
the
DC
levels reach their operating values. During this period
the unit will not operate normally. The same applies when the power
is
cut
as
the DC
levels
drop
below
their operating values.
The following circuit will overcome any problems which may arise in
extreme circumstances due to this phenomenon.
(Svrtem
design circuit example
When
AC
-
Whn
AC
DC
POWER
FUSE
I
I
TRANSFORMER
OUTPUT UNIT
t-'
I
'1:
Run/stop circuit interlocked with
RA1
(run monitor relay)
'2:
Battery low alarm
'3:
RA1
turned on
by
M9039
(run monitor relay)
'4:
bwer to output equipment turned
off
when
STOP
signal given.
'5:
Input switched when power supply established.
'6:
st
time for
DC
power supply to
be
established (rpprox.
0.5
SWS)
'7:
On when run
by
M9039
'8:
Interlock circuit
as
necessary.
APP-7
IB
INN
BglOl-A
--
.
...-
To Next Page
Loading...
Need help?
General
