Mitsubishi Electric FR-A720-0.4K Instruction Manual page 42

Control circuit specifications
4) Sink logic and source logic
⋅ In sink logic, a signal switches on when a current flows from the corresponding signal input terminal.
Terminal SD is common to the contact input signals. Terminal SE is common to the open collector output signals.
⋅ In source logic, a signal switches on when a current flows into the corresponding signal input terminal.
Terminal PC is common to the contact input signals. Terminal SE is common to the open collector output signals.
Current flow concerning the input/output signal
when sink logic is selected
Sink logic
Current
STF
STR
SD
Inverter
RUN
• When using an external power supply for transistor output
⋅ Sink logic type
Use terminal PC as a common terminal to prevent a
malfunction caused by undesirable current. (Do not
connect terminal SD of the inverter with terminal 0V of
the external power supply. When using terminals PC-
SD as a 24VDC power supply, do not install a power
supply in parallel in the outside of the inverter. Doing so
may cause a malfunction due to undesirable current.)
AY40 type
transistor
output unit
1
2
9
9
10
24VDC SD
32
R
R
DC input (sink type)
<Example: AX40>
1
R
R
-
+
SE
9
24VDC
Current flow
Inverter
STF
24VDC
(SD)
STR
PC
Current flow
Current flow concerning the input/output signal
when source logic is selected
Source logic
Sink
Current
connector
Inverter
⋅ Source logic type
When using an external power supply for transistor
output, use terminal SD as a common to prevent
misoperation caused by undesirable current.
AY80 type
transistor
output unit
PC
STF
R
STR
R
DC input (source type)
<Example: AX80>
RUN 1
R
-
+
SE 9
24VDC
Current flow
Inverter
9
PC
STF
1
2
STR
SD
10
Current flow
Source
connector
R
24VDC
(SD)