EM15 User’s Manual
3. Installation of Frequency Inverter
27
Type
Terminal
Symbol
Terminal Name
Terminal function description
RS485
Output
485+
Communication
port terminal
Input and output signal terminals for MODBUS protocol
communication
485-
Auxiliary
interface
PG card interface
PG cards: Open-collector, differential are selectable options.
Communications expansion
Reversed
External keypad interface
Connected to an extending keypad
Jumper
PE-COM
COM grounding PE selection, default connected.
In the meeting of interference, connecting PE to COM can improve
anti-interference
PE-GND
GND grounding PE selection, default connected.
In the meeting of interference, connecting PE to COM can improve
anti-interference ability.
AI1
AI1 output type selection.
Voltage or Current output, voltage output by default.
AI2
AI2 output type selection.
Voltage or Current output, current output by default.
AO1
AO1 output type selection.
Voltage or Current output, voltage output by default.
AO2
AO2 output type selection.
Voltage or Current output, voltage output by default.
485
485 communication resistor selection,
default connection ON.
In the case of interference,
anti-interference can be improved.
3.10.4 Wiring of Analog Input Terminals
When the voltage signal is used as analog input, it is vulnerable from outside interference. Please use shielding
cable, and ensure that the shielding cable reliably connect to the grounding. The cable should be as short as
possible, and keep away from power lines. In serious interference occasions, you might consider to add a filter
capacitor or ferrite core ring in signal cable.
Diagram 3-14 Wiring of analog input terminals