User Manual EM303B General Purpose Inverter EM303B provides 3 programmable output terminals including 2 multi-function output terminals and 1 relay output terminal. There are 0 ～ 32 program codes. User can define output variables of terminals. 2 multi-function output terminals are in OC output mode. Output common port is connected to COM. When selected program code is enabled, the electronic switch is ON, and when it is disabled, the electronic switch is OFF. OC can be powered either internally or externally, as shown in Figure 7-8(a) and 7-8(b) respectively. If it is externally powered, the voltage range is required to be within 8~24V.
（ a ） Internal Power supply （ b ） External Power supply Figure 7-8 Power Supply Modes of Programmable Terminals Relay output is provided by the internal relay of inverter. Relay has 1 set of NO contacts and 1 set of NC contacts.When the selected programmable code is disabled, EB-EC is NC, and EA-EC is NO. When the selected program code is enabled, the coil of internal relay is power-on, EB-EC is off, and EA-EC is on, as shown in Figure 7-9. Function of Y1, Y2 and R1 can be defined by setting the value of F2-12~F2-14. See Table 7-3 for the functions of numeric multi-function output terminals.
Figure7-9 Relay Contacts Table 7-3 Functions of Numeric Multi-function Output Terminals 100 EM303B +24V 24V PLC +5V Y1.Y2 COM Relay EM303B +24V 24V PLC +5V Y1.Y2 COM Relay + DC- Y1.Y2 Y1.Y2 No. Function Description Inverter Runs (Enabled at Running) When inverter is running, the output terminal is on. 0 Frequency Reach Range FAR (Enabled at running) If |output frequency–setting input frequency| 1 Output Frequency Detection Range FDT1(Enabled at running) When inverter is running, if the output frequency increases to the value of F9-12 (FDT1 Increasing Threshold), the output terminal is on.
If the output frequency drops and is less than the value of F9-13 (FDT1 Decreasing Threshold), the output terminal is off. See 7.13.3 for details. 2 Output Frequency Detection Range FDT2 (Enabled at running) When inverter is running, if the output frequency increases to the value of F9-14 (FDT2 Increasing Threshold), the output terminal is on. If the output frequency drops and is less than the value of F9-15 (FDT2 Decreasing Threshold), the output terminal is off. See 7.13.3 for details. 3