User Manual
EM303B General Purpose Inverter
35
C. See Figure 3-16-c for NPN mode with external power supply (Please note that
disconnect terminal PLC from terminal 24V)
+
-
DC
+24V
+3.3V
+
-
PLC
24V
EM303B
+3.3V
+
-
COM
X7
X1
PE
External Controller
Grounding Shield Cable
COM
1
7
Figure 3-16-c NPN Mode with External Power Supply
D. See Figure 3-16-d for PNP mode with external power supply (Please note that disconnect
terminal PLC from terminal 24V).
+24V
+3.3V
+
-
PLC
24V
EM303B
+3.3V
+
-
COM
X7
X1
PE
External Controller
Grounding Shield Cable
COM
1
7
+
-
DC
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 < the
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.
+3.3V
COM
EM303B
PLC
Y1.Y2
+24V
24V
Relay
Figure 3-17-a Multi-function Terminal with Internal Power Supply