1. Model Code Breakdown

• 31C: MOVITRAC 31C compact series

• 008: 0.75 kW rated output (Size 1)

• 503: 380–500 VAC, 3‑phase

• 4: 4‑quadrant (built‑in brake chopper)

• 01: Standard + FBG31C keypad (no fieldbus)

2. Electrical Ratings (400 V / 50–60 Hz)

• Rated Output Power: 0.75 kW

• Input: 3×380–500 VAC, 50/60 Hz

• Rated Input Current: 2.1 A

• Rated Output Current: 2.5 A (continuous)

• Output Capacity: 1.8 kVA

• Output Voltage: 0–480 VAC, 3‑phase

• Output Frequency: 0–400 Hz

• Control: V/f open‑loop / sensorless vector

• Overload: 150% for 60 s

• Switching Freq: 4/8/12/16 kHz (selectable)

• STO: Standard (PL d / SIL2)

3. Mechanical & Environmental

• Protection: IP20

• Cooling: Natural convection (no fan)

• Operating Temp: 0 °C … +45 °C (full load)

• Storage Temp: −25 °C … +70 °C

• Humidity: 5–95%, non‑condensing

• Altitude: ≤1000 m (no derating)

• Size: Size 1

• Weight: ~2.0 kg

4. Interfaces & Terminals

Control I/O

• Analog In: 0–10 V / 0–20 mA

• Digital In: 6 × 24 VDC (programmable)

• Relay Out: 2 × programmable (250 VAC / 30 VDC, 3 A)

• Motor Thermistor: PTC/KTY

Communication & Keypad

• Onboard RS‑485 (Modbus RTU)

• Integrated FBG31C keypad (display/param, no external keypad needed)

• No fieldbus (use ‑20 for PROFIBUS‑DP)

Power Terminals

• X1: L1/L2/L3 (3‑phase input)

• X2: U/V/W (motor) + PE

• DBU: Brake resistor (internal chopper)

5. Core Functions

• V/f / sensorless vector (low‑speed high torque)

• Accel/decel: 0.1–600 s

• DC braking + dynamic braking

• Energy‑saving mode

• Local (keypad) / terminal / RS‑485 control

• Slip compensation (speed stability)

• Soft start/stop

• Built‑in PID (pressure/speed)

• Parameter save/restore/copy

6. Protection Features

• Overcurrent / thermal overload

• Overvoltage / undervoltage

• Input phase loss

• Overtemperature

• Electronic motor thermal protection

• Short circuit / earth fault

• Anti‑stall

• ESD protection

• Hardware STO (PL d / SIL2)

7. Key Difference: 31C008‑503‑4‑01 vs ‑00

• ‑01: Integrated FBG31C keypad (built‑in display/keys)

• ‑00: No keypad (needs external FBG31C)

  All other specs (power, current, I/O, STO) are identical.

8. Applications

• Small 3‑phase motor speed control

• Light industrial automation

• Fans, pumps (energy saving)

• Packaging/conveyors

• Systems needing local keypad operation + RS‑485/Modbus

9. Compliance

• CE (Low Voltage, EMC)

• EN 61800‑3 (EMC)

• RoHS

• STO: PL d, SIL2