Mitsubishi Electric FREQROL HC Instruction Manual page 36

Using the PC terminal
Instruction for contact inputs
This terminal is used to connect transistor output (open collector output)
such as a programmable controller (PC). Connecting the external power
supply common for transistor output to the PC terminal prevents a faulty
operation caused by a sneak current.
(The power supply voltage of the PC terminal should be 24VDC.)
<Correct connection>
AY40 transistor
output module
1
x2
2
x1
3
SOF
4
RES
9
PC
10
DC SD
24V
High power factor converter
The AY40 module requires a 24VDC power supply.
Since input signals to the control circuit are at a low level, use two parallel
micro signal contacts or twin contact for contact inputs to prevent a contact
fault.
Micro signal contacts
- 27 -
<Incorrect connection>
AY40 transistor
output module
DC
24V
(SD)
Twin contact
DC
1
24V
x2
(SD)
2
x1
3
SOF
4
RES
9
PC
10
DC SD
24V
High power factor converter