Mitsubishi Electric FR-S520E Series Instruction Manual page 38

How to use the control circuit terminals
2) Source logic type
• In this logic, a signal switches on when a current flows into the corresponding signal
input terminal.
Terminal PC is common to the contact input signals. For the open collector output
signals, terminal SE is a positive external power supply terminal.
Source logic
PC
Current
STF
R
STR
R
• Use terminal SD as a common terminal,
and perform wiring as shown on the right.
(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.)
Inverter
Source
connector
QY80 type transistor
28
DC input (source type)
<Example: QX80>
TB1
RUN
R
TB18
SE
24VDC
Current flow
output unit
PC
TB1 STF
TB2
STR
Constant
voltage
TB17
Fuse
circuit
TB18 SD
Current flow
R
Inverter
24VDC
(SD)