Zm-7205a Manual -

For applications where an existing controller already generates a PWM signal (e.g., from a PLC or microcontroller), the PWM signal’s positive terminal should be connected to VSP and the negative terminal to V‑. The duty cycle of the PWM signal determines the motor speed; a higher duty cycle gives higher speed. The PWM frequency typically ranges from 100 Hz to 1 kHz, and it is recommended to keep the frequency above 50 Hz, ideally 100 Hz.

Wire your chosen speed control interface to V_REF and GND . zm-7205a manual

🔧 Note: Calibration requires a precision source and should not be attempted without proper training. from a PLC or microcontroller)