Mitsubishi Electric FR-D720-0.2K-G Instruction Manual page 32

(1) Sink logic type and source logic type
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
R
STR
R
SD
Drive unit
RUN
SE
24VDC
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
drive unit with terminal 0V 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
drive unit. Doing so may cause a malfunction in the drive
unit due to undesirable currents.)
QY40P type transistor
output unit
TB1
TB2
TB17
Constant
voltage
circuit
TB18
24VDC SD
Sink
connector
DC input (sink type)
<Example: QX40>
TB1
R
R
TB17
Current flow
Drive unit
STF
24VDC
(SD)
STR
PC
Current flow
Control circuit specifications
Current flow concerning the input/output signal when source logic is
selected
Source logic
PC
Current
STF
R
STR
R
Drive unit
RUN
SE
24VDC
Current flow
Source logic type

Use terminal SD as a common terminal, and perform
wiring as shown below. (Do not connect terminal PC of the
drive unit 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
drive unit. Doing so may cause a malfunction in the drive
unit due to undesirable currents.)
QY80 type transistor
output unit
TB1
TB2
Constant
voltage
TB17
Fuse
circuit
TB18
Source
connector
DC input (source type)
<Example: QX80>
TB1
R
R
TB18
Drive unit
PC
STF
24VDC
(SD)
STR
SD
Current flow
2
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