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Mitsubishi Electric FR-CS84-012 Instruction Manual Page 38

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 Sink logic and source logic
• In the sink logic, a signal turns ON when a current exits from the corresponding signal input terminal.
Terminal SD is common to the contact input signals.
• In the source logic, a signal turns ON when a current enters into the corresponding signal input terminal.
Terminal PC is common to the contact input signals.
●Current flow concerning the input/output signal
when sink logic is selected
Sink logic
Current
STF R
STR
R
SD
• When using an external power supply for transistor output
Sink logic
Use terminal PC as a common terminal, and perform wiring as
follows. (Do not connect terminal SD on the inverter with the
terminal of 0 V for the external power supply. When using
terminals PC-SD as a 24 VDC 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.)
IQ-Rtype transistor
output unit
TB1
TB2
Constant
TB17
voltage
circuit
TB18
24 VDC SD
Sink
connector
Inverter
STF
24 VDC
(SD)
STR
PC
Current flow
●Current flow concerning the input/output signal
when source logic is selected
Source logic
PC
Current
STF R
STR
R
Source logic
Use terminal SD as a common terminal, and perform wiring as
follows. (Do not connect terminal PC on the inverter with the
terminal of +24 V for the external power supply. When using
terminals PC-SD as a 24 VDC 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.)
IQ-R type transistor
output unit
TB1
TB2
Constant
voltage
TB17
Fuse
circuit
TB18
Source
connector
Inverter
PC
STF
24 VDC
(SD)
STR
SD
Current flow
2. INSTALLATION AND WIRING
2.6 Control circuit
1
2
3
5
5
6
7
8
9
10
37

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