Mitsubishi Electric FR-D720-070 Instruction Manual page 35

(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
DC input (sink type)
<Example: QX40>
Inverter
RUN
TB1
R
TB17
SE
24VDC
Current flow
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 an external power supply in parallel with the
inverter. Doing so may cause a malfunction in the inverter
due to undesirable currents.)
Inverter
QY40P type transistor
output unit
TB1 STF
TB2 STR
TB17
Constant
voltage
PC
circuit
TB18
24VDC SD
Current flow
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Control circuit specifications
Current flow concerning the input/output signal when source logic is
selected
Source logic
PC
Sink
Current
connector
STF
R
STR
R
Inverter
RUN
R
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
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
24VDC
(SD)
Constant
voltage
Fuse
circuit
Source
connector
DC input (source type)
<Example: QX80>
TB1
R
R
TB18
2
Inverter
PC
TB1 STF
24VDC
(SD)
TB2 STR
TB17
TB18 SD
Current flow
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