One inverter, one motor
Inverter kW ≥ motor kW, and inverter current ≥ 1.1 × motor current.
Inverters / VFD
Variable frequency drives and dedicated drivers matched to LEONHARD motors, with an English catalog you can download.
1φ 220V / 3φ 380V in3φ 220V / 380V outModbus-RTU RS485Over-current · overload · short · over-voltage · phase lossLEONHARD logo
Inverters / VFD
Single-phase VFD — 220V in, 220V three-phase out for delta-connected motors. Example: 0.75 kW / 220V.
Three-phase VFD — 380V in on R/S/T, 380V out on U/V/W.
Functions: frequency speed control, FWD/REV from keypad or terminals, multi-speed, analog VI 0–10V / CI 4–20mA, PID (pressure / flow / temperature), Modbus-RTU on RS485.
On 0–50 Hz, torque falls as frequency falls. On 50–100 Hz, torque falls as frequency rises. Keep gear-motor inverter frequency below 60 Hz in normal service. A brake motor needs a separate 220V single-phase supply for the brake.
How to size
One inverter, many motors
Inverter kW × 1.5 ≥ the sum of motor kW.
Long low-speed running needs an inverter-duty motor with a forced fan. Flux-vector inverters hold torque better at low speed. Share a panel with a HMI only with shielded cable or line reactors.
Controllers / Dedicated Drivers
AC 220/240V 50/60 Hz. 4-pole 90–1400 rpm; XF and FP also 2-pole 180–2800 rpm. Do not use a governor for frequent reversing.
US
Economy 5-wire. Same envelope 6W–200W; capacitor changes with wattage.
SS-22
Remote potentiometer, 220/240V 50/60 Hz.
XF
Panel mount, 2-pole and 4-pole ranges.
FP
MCU display with KEY / REV / STOP / FWD.
Match a VFD to a GH/GV or YS motor
Send motor kW, current and whether one inverter will drive several motors.