Mitsubishi Melsec-A Series User Manual page 163

APPENDKES
/ M E L S E C = -
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
-
W h n
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: b w e r to output equipment turned off when STOP signal given.
'5: Input switched when power supply established.
' 6 : s t
time for DC power supply to
be
established (rpprox.
0.5
S W S )
'7: On when run by M9039
'8:
Interlock circuit as necessary.
APP-7
IB
INN
BglOl-A