Mitsubishi Electric 800 Series Hardware Instruction Manual page 52

Sink logic
Use terminal PC as a common terminal, and perform wiring as
shown below. (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.)
QY40P type transistor
output unit
TB1
TB2
TB17
Constant
voltage
circuit
TB18
24 VDC SD
Inverter
STF
24 VDC
(SD)
STR
PC
Current flow
Source logic
Use terminal SD as a common terminal, and perform wiring as
shown below. (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.)
QY80 type transistor
output unit
TB1
TB2
Constant
voltage
TB17
Fuse
circuit
TB18
Current flow
Inverter
PC
STF
24 VDC
(SD)
STR
SD
2. INSTALLATION AND WIRING
2.6 Control circuit
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