Pro
15 min
Wiring 7 — 0-10 V Analog Output (VFD Speed Reference)
wiringanalog-output0-10vvfdspeed-reference
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Briefing
Variable-frequency drives (VFDs) often accept a 0-10 V signal as their speed reference. **Circuit:** `PLC analog output (%QW0) → VFD AI1+ terminal` `PLC analog output common → VFD AI1- terminal (0 V reference)` The output voltage scales linearly: - 0 V = 0 Hz (motor stopped) - 10 V = maximum frequency (e.g. 50 Hz) Wire the PLC analog output **%QW0** to the VFD AI1 differential input.
Objectives
- Wire PLC analog output %QW0 signal to VFD AI1+ terminal
- Wire PLC analog output common to VFD AI1− terminal
Hints
- 0-10 V is a voltage reference — cable impedance matters more than in a current loop.
- Keep the signal cable short and shielded; connect cable shield to earth at one end only.
I/O Table
Outputs
AO_SIGNALAnalog output signal (0-10 V) → VFD AI1+
INT · %QW0
AO_COMAnalog output common → VFD AI1−
INT · %QW1
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