Delta Compact Drive MS300 IP66/NEMA 4X Series User Manual page 45

When the photo coupler is using the internal power supply, the switch connection

for Sink and Source modes are as shown in Figure 6-2 and Figure 6-3 above:
MI-DCM: Sink mode, MI-+24V: Source mode.
Transistor output terminals (MO1, MO2, MCM)
Make sure to connect the digital outputs to the correct polarity. See the wiring

diagram when connecting a relay to the digital output, connect a surge absorber
across the coil, and check the polarity.
Chapter 6 Control Circuit Terminals MS300 (IP66 / NEMA 4X)
6-3