Mitsubishi Electric Q172DCPU User Manual page 100

3 DESIGN
Input switched
when power supply
established.
RUN/STOP circuit
interlocked with RA1
(run monitor relay)
Power supply module
Interlock circuits as
necessary. Provide
external interlock
circuits for conflicting
operations, such as
forward rotation and
reverse rotation,
and for parts that could
damage the machine or
cause accident if no
interlock were used.
The power-ON procedure is as follows:
For AC/DC
1) Switch power ON.
2) Set CPU to RUN.
3) When DC power is established, RA2 goes ON.
4) Timer (TM) times out after the DC power reaches 100[%]. (The TM set value should be the period of time
from when RA2 goes ON to the establishment of 100[%] DC voltage. Set this value to approximately 0.5
seconds.)
5) Turn ON the start switch.
6) When the magnetic contactor (MC) comes on, the output equipment is powered and may be driven by the
program. (If a voltage relay is used at RA2, no timer (TM) is required in the program.)
(b) System design circuit example(when using ERR terminal of
power supply module)
Power supply
FOR AC/DC
Transformer
Fuse
CPU module
SM52
SM403
XM
N0
TM
MC1 N0 M10
M10
Program
START SW
RA1 RA3
MC
STOP SW
RA2
output module
Ym
Yn
ERR
output module
MC2
MC1
Transformer
Fuse
DC power
Ym
(-) ( )
+
Yn Fuse
Set time for DC power
TM
supply to be established.
MC
RA2
Voltage relay
is recommended
XM
Low battery alarm
L
(Lamp or buzzer)
RA1
OFF at ERR contact OFF
(stop error occurrence)
RA3
MC MC
Output by ERR contact OFF
Power OFF of equipment
In the case of an
MC1 emergency stop or a
stop caused by a limit
switch.
MC2
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