Mitsubishi Electric FR-A820-00046 Instruction Manual page 81

Installation and wiring
● When using an external power supply for transistor output
– Source logic
Use the terminal SD as a common terminal, and perform wiring as shown below. (Do not connect
terminal PC of the inverter with the terminal +24 V of the external power supply. When using
terminals PC-SD as a 24 V DC 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.)
QY80P type transistor
output unit
– Sink logic
Use the terminal PC as a common terminal, and perform wiring as shown below. (Do not connect
terminal SD of the inverter with the terminal 0 V of the external power supply. When using
terminals PC-SD as a 24 V DC 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
FR-A800
PC
TB1 STF
TB2 STR
Constant
voltage
Fuse
TB17
circuit
TB18 SD
Current flow
Inverter
TB1 STF
TB2 STR
TB17
Constant
voltage
PC
circuit
TB18
24 V DC
SD
Current flow
Fig. 2-28:
Inverter
Using an external power supply in connection with
the outputs of a PLC (source logic)
24 V DC
(SD)
Fig. 2-29:
Using an external power supply in connection with
24 V DC
the outputs of a PLC (sink logic)
(SD)
Control circuit
I002372E
I002371E
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