1. Model Code Decoding

• 31B = MOVITRAC 31B compact series (high‑power density)

• 055 = 55 kW rated output power

• 503 = 400 VAC (380–480 V) voltage class

• 4 = 3‑phase AC input

• 00 = standard firmware, no options

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

• Rated output power: 55 kW (3‑phase asynchronous motor)

• Input: 3‑phase AC 380–480 V, 50/60 Hz ±5%

• Rated input current: ~99 A

• Rated output current: 110 A (continuous); 123.8 A (125% overload)

• Output voltage: 0–480 VAC, 3‑phase

• Output frequency: 0–400 Hz (V/f or sensorless vector)

• Overload: 150% / 60 s; 125% continuous

• Switching frequency: 2–16 kHz (adjustable)

• Power factor: ≥ 0.95 at full load

• Efficiency: ≥ 97% at rated load

• Safety: STO (Safe Torque Off) PL d / SIL 2 (standard)SEW-EURODRIVE

3. Mechanical & Environmental

• Protection class: IP20 (front panel)

• Cooling: high‑performance built‑in fan, vertical mounting

• Ambient temp: 0 °C … +45 °C (full power); up to +50 °C with derating

• Storage temp: −25 °C … +70 °C

• Humidity: 5–95 %, non‑condensing

• Altitude: ≤ 1000 m (no derating)

• Vibration: 10–55 Hz, 0.15 mm amplitude

• Dimensions (W×H×D): 320 × 520 × 255 mm

• Weight: 18.5 kg

4. Standard Interfaces & Terminals

Control & I/O

• Analog input: 0–10 V DC / 0–20 mA (speed ref, 12‑bit)

• Digital inputs: 6 × 24 V DC programmable (sink/source)

• Relay output: 2 × programmable (250 V AC / 30 V DC, 3 A)

• Motor thermistor: PTC/KTY input (overheat protection)

Communication

• RS‑485 onboard (Modbus RTU / SEW internal bus)

• Optional: PROFIBUS‑DP, Ethernet/IP, PROFINET

• Keypad: DBG 31 (parameter setup & display)

Power Terminals

• X1: L1/L2/L3 (3‑phase input)

• X2: U/V/W (motor output) + PE

• DBU: brake resistor connection (integrated brake chopper, 4‑quadrant)

5. Main Functions

• V/f open‑loop or sensorless vector control (high torque at low speed)

• 4‑quadrant operation (integrated brake chopper for regenerative loads)

• Accel/decel: 0.1–600 s adjustable (independent ramps)

• Dynamic braking + DC injection braking (fast stop & holding)

• Slip compensation (improves speed accuracy under load)

• Multi‑step speed: up to 8 preset speeds (terminal selectable)

• Built‑in PID (pressure/flow/speed closed‑loop control)

• Energy‑saving mode (light‑load voltage reduction)

• Parameter copy (keypad/communication for fast setup)

6. Protection Features

• Overcurrent (instantaneous & thermal)

• Overvoltage / undervoltage

• Input phase loss detection

• Inverter overtemperature (IGBT/heatsink)

• Motor overload (electronic thermal relay)

• Output short circuit & earth fault

• Stall prevention (anti‑stall during acceleration)

• Reverse polarity & ESD protection

• STO safe torque off (hardware‑based safety, PL d / SIL 2)SEW-EURODRIVE

7. Installation & Wiring Notes

• Mounting: vertical, ≥ 150 mm clearance top/bottom for airflow

• Power cables: shielded 4‑core (L1/L2/L3/PE), ≥ 25 mm²

• Motor cables: shielded, max length 100 m (with filter)

• Control cables: twisted pair, shielded, routed separately from power cables

• Grounding: PE ≤ 4 Ω, star grounding recommended

8. Compliance & Standards

• CE (Low Voltage Directive 2014/35/EU)

• EMC: EN 61800‑3, Category C2 (industrial environment)

• RoHS 2011/65/EU compliant

• STO: EN ISO 13849‑1 PL d, IEC 61508 SIL 2SEW-EURODRIVE

9. Typical Applications

• Heavy‑duty conveyors & material handling

• Large industrial fans & pumps (energy‑saving retrofit)

• Crushers, mixers, extruders (high starting torque)

• Textile, printing, packaging machinery

• General‑purpose industrial drives (55 kW class)