Mitsubishi Electric FR-F740-00023 Instruction Manual page 35

Control circuit specifications
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, and perform
wiring as shown below. (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.)
QY40P type transistor
output unit
TB1
TB2
Constant
TB17
voltage
circuit
TB18
26
R
R
DC input (sink type)
<Example: QX40>
TB1
R
R
-
+
TB17
SE
24VDC
Current flow
Inverter
STF
24VDC
(SD)
STR
PC
24VDC SD
Current flow
Current flow concerning the input/output signal
when source logic is selected
Source logic
Sink
Current
connector
Inverter
Source logic type
Use terminal SD as a common terminal, and perform
wiring as shown below. (Do not connect terminal PC of
the inverter with terminal +24V of the external power
supply. When using terminals PC-SD as a 24VDC
power supply, do not install an external power supply in
parallel with the inverter. Doing so may cause a
malfunction in the inverter due to undesirable currents.)
QY80 type transistor
output unit
Constant
voltage
circuit
PC
STF
R
STR
R
DC input (source type)
<Example: QX80>
TB1
RUN
R
- TB18
+
SE
24VDC
Current flow
Inverter
PC
TB1 STF
TB2 STR
TB17
Fuse
TB18 SD
Current flow
Source
connector
R
24VDC
(SD)