User Manual EM303B General Purpose Inverter C. See Figure 3-16-c for NPN mode with external power supply (Please note that disconnect terminal PLC from terminal 24V) External Controller +3.3V +3.3V Grounding Shield Cable D. See Figure 3-16-d for PNP mode with external power supply (Please note that disconnect terminal PLC from terminal 24V). Figure 3-16-c NPN Mode with External Power Supply External Controller +3.3V +3.3V Grounding Shield Cable Figure 3-16-d PNP Mode with External Power Supply 3.3.5 Wiring Relay Output Terminal The surge voltage absorbing circuit should be installed for inductive load like relay or contactor. For instance:
RC absorbing circuit (please note that the leakage current working current of contactor or relay being controlled), VDR or fly-wheel diode and etc. (For DC electromagnetic circuit, please pay attention to the polarity at installation). The component of absorbing circuit should be installed near the ends of relay coil or contactor. 3.3.6 Wiring Multi-function Output Terminal Multi-function output terminals Y1 and Y2 can take 24V internal power supply of inverter or external power supply as shown in Figure 3-17.
Figure 3-17-a Multi-function Terminal with Internal Power Supply 35 D EM303 24V +24V PLC + X1 - + X7 - COM PE C+ - 1 7 CO COM + - EM303 24V +24V PLC + X1 - + X7 - COM PE DC 1 EM303B +24V 24V PLC +3.3V Y1.Y2 COM Relay Y1.Y2