Siemens 6SE6440-2UC15-5AA1 Frequency Inverter

✅ Model Code Explanation

📋 Key Technical Specifications

Rated Power: 0.55 kW (Constant Torque)

Input Voltage: AC 200–240V ±10%, 47–63Hz, compatible with single-phase or three-phase input

Rated Output Current: 3.0 A

Overload Capacity: 150% for 60s; 200% for 3s

Protection Class: IP20

Overall Dimensions(H×W×D): 173 × 73 × 149 mm (Frame Size A)

Net Weight: approx. 1.3 kg

Ambient Temperature: -10 ~ +50℃ (no power derating)

Control Modes: V/F control, vector control, built-in PID, Modbus RTU supported

Standard Equipment: BOP panel; no integrated EMC filter

📌 Product Lifecycle

MM440 discontinued in 2019, available only as spare parts. No mass-production new units. Stock new units or used refurbished units circulate in the market.

🔄 Replacement Selection

1. Direct replacement series: G120 Inverter

Recommended: 6SL3210-1PB13-0UL0 (0.55kW 220V, without filter), BOP-2 panel to be ordered separately.

2. Retrofit Note: Terminal definitions and parameter systems differ between MM440 and G120. Control logic and parameters require full re-commissioning.

🛠 Typical Applications

Conveyor belts, small fans & water pumps, mixers, small conveying equipment, packaging machinery. Suitable for speed regulation of 0.55kW, 220V AC asynchronous motors.

📎 Optional Accessories

BOP: 6SE6400-0BP00-0AA1 (factory fitted)

AOP Advanced Operator Panel: 6SE6400-0AP00-0AA1

EMC Filter: 6SE6400-2FA00-6AD0

Braking Resistor: Optional as required (usually unnecessary for 0.55kW low power)

⚠️ Troubleshooting Summary (General for MM440)

1. F0001 Overcurrent: Motor short circuit, damaged cable, earth fault, power module failure
2. F0002 Overvoltage: Rapid deceleration, grid surge; braking resistor may be required
3. F0003 Undervoltage: Missing input phase, voltage drop
4. F0011 Overtemperature: Blocked cooling channel, excessive ambient temperature, fan damage

HS Code

85044084 (Static converters, frequency inverters)

Siemens 6SE6440-2UC15-5AA1 (MM440, 220V 0.55kW) Application Scenarios

Core Features: Single/three-phase 220V power supply, vector control, built-in PID, Modbus RTU, stable speed regulation at low torque. Power limited to 0.55kW, only compatible with small-load motors, widely used for stand-alone small automation equipment retrofit and spare part replacement for legacy machines.

1. Material Conveying (Most Common)
2. Small belt conveyors, roller conveyors: Short packaging line conveyors, laboratory transport tables, small sorting branch lines. Soft start & soft stop prevent material slipping or tipping; multi-speed function available.
3. Small hoists / miniature winches: Light-duty lifting mechanisms. MM440 vector control delivers stable low-speed torque for light-load lifting within 0.55kW power limit.
4. Fluid Equipment (Fans & Pumps, PID for constant pressure/flow)
5. Small centrifugal fans, duct exhaust fans: Workshop local exhaust, oven circulation fans; energy saving via variable speed drive.
6. Mini water pumps, metering pumps: Constant pressure water supply, chemical dosing pumps. Built-in PID performs closed-loop constant pressure/flow control with 4-20mA analog feedback.

Advantage for low-flow cases: 220V single-phase power input, preferred where 380V three-phase power is unavailable on site.

III. Packaging & Light Industrial Machinery

1. Small packaging machines: Film feeding for pillow packaging, label feed motors, screw bottle separation drive. Smooth start-stop and PLC-linked speed control.
2. Food light industry equipment: Small mixing tanks, blenders, extrusion actuators (0.55kW small mixing motors), auxiliary drives for food production lines.
3. Textile auxiliary machines: Small rewind/unwind units for simple tension control.
4. Machine Tools & Automation Auxiliary Equipment
5. Machine tool auxiliary drives: Coolant pumps, small lubrication pumps, auxiliary table feed motors.
6. Rotary tables, indexing turntables: Stable low-speed rotation for point positioning.
7. Automation training benches / teaching equipment: Classic MM440 teaching unit for colleges, used to learn vector control, Modbus communication and multi-speed programming.
8. HVAC, Building & Other Auxiliary Systems
9. Small air damper actuators, fresh air units
10. Gate valves, small roller shutter drives: Speed control for workshop small doors and automatic roller shutters
11. Spare part replacement for legacy equipment: Retrofit for original equipment fitted with this MM440 model. The series is discontinued, so it is mostly used for maintenance replacement.

✅ Selection Prerequisites & Limitations

Power Supply: Site available power is AC220V (single-phase input can drive three-phase motors)

Motor: Rated motor power ≤0.55kW three-phase asynchronous motor

Strengths: Good low-speed torque with vector control, equipped with BOP panel, built-in PID, relay/analog I/O, Modbus communication; more capable than basic simple inverters

❌ Not suitable: Heavy shock loads, high-power machinery, main hoisting winches, continuous high-overload operating conditions

Supporting Control Schemes

Local speed setting via panel: Manual frequency adjustment through BOP

Multi-speed via terminals: DI digital terminals for preset speed levels

Analog closed-loop: AI connected to pressure/flow sensors, PID automatic constant pressure/flow regulation

PLC communication: Modbus RTU for PLC to read/write frequency, running status and fault codes

Siemens 6SE6440-2UC15-5AA1 (MM440 0.55kW 220V, No Built-in EMC Filter) Replacement Models Summary

Original unit features: AC200~240V single/three-phase input, vector control, PID, Modbus RTU, 4DI/2AI/2AO, 2 relay outputs; discontinued, no new original production.

Selection Priority: Siemens official successor models → Siemens economy models → Domestic vector inverters

1. Siemens Officially Recommended Replacements (First Choice, Closest function to MM440)
2. SINAMICS G120 (Modular, function matches MM440, for complex original control: PID, multi-speed, Modbus)

Power Module: 6SL3210-1PB13-0UL0 (200-240V, 0.55kW, no integrated filter, output current 3A consistent with original unit)

Matching Control Unit: CU240E-2 (6SL3244-0BB12-1BA1), optional BOP-2 panel (6SL3255-0AA00-4CA1)

✅ Advantages: Sensorless vector support, built-in PID, Modbus RTU, I/O count close to MM440; expandable communication

⚠️ Note: Terminal definitions and parameter codes are fully incompatible; parameters cannot be copied directly. Re-commissioning required, cutout dimensions differ.

2. G120C Compact Integrated Type (All-in-one, simple installation, space-saving, preferred for fans/conveyors/pumps)

Order No.: 6SL3210-1KE11-8UB2 (220V 0.55kW, no filter, integrated built-in control unit, BOP interface available)

✅ All-in-one design, separate power module + CU not required. Ideal for cabinet retrofit with limited space; STO safety function integrated

⚠️ I/O count slightly less than original MM440; evaluate carefully for complex logic

3. SINAMICS V20 (Economy type, simple speed regulation with budget constraints)

Order No.: 6SL3210-5BB11-2UV1 (220V, 0.55kW, no integrated filter)

✅ Lower cost, supports V/F / basic vector, Modbus, multi-speed; suitable for fans, pumps and simple conveyors without high-precision low-speed torque requirement

❌ Limitations: Vector performance weaker than MM440/G120, not for low-speed heavy-load applications, fewer I/O points

1. Same-series Spare Part Option (Not recommended for new projects, emergency maintenance only)

Stock MM440 original unit: 6SE6440-2UC15-5AA1 stock new / second-hand refurbished

Risks: Limited supply, high price, no warranty, ageing risk for used units. Only for short-term equipment transition, not for new projects.

III. Domestic Replacements (Cost-down retrofit, vector control, 220V single-phase input driving three-phase motors)

Applicable for retrofit projects where wiring and PLC program modification are permitted, pursuing cost advantages

1. Inovance MD600 / MD380 220V 0.55kW: Vector control, Modbus, PID, abundant I/O
2. INVT GD20: General vector inverter, widely used for packaging & conveying machinery
3. Delta VFD-EL / VFD-M: Low-power 220V single-phase input, basic speed regulation scenarios

📌 Selection Comparison Table

⚠️ Critical Retrofit Notes

1. Power Supply Compatibility: The original unit accepts single-phase 220V input for three-phase motor drive. G120C/G120/V20 models of the same specification also support this mode.
2. Cutout Dimensions: Frame A cutout for MM440 differs from G120/V20. Cabinet cutout modification is usually required.
3. Parameter Incompatibility: MM440 P-parameter system is independent from G120/V20; parameter upload/download cannot be performed directly.
4. EMC: Original unit has no integrated filter. Select filterless variant for replacement. Install external EMC filter if noise immunity is needed.
5. Braking: Evaluate braking resistor sizing if the machine requires rapid stopping.

✅ Quick Selection Guidance

Original machine uses low-speed vector, PID constant pressure, Modbus communication, multi-speed → Select G120 (modular CU240E-2)

Simple fan/conveyor application, all-in-one unit preferred for compact cabinet → G120C

Basic speed regulation only, no complex closed loop, budget priority → V20

Cost reduction project, domestic commissioning acceptable → Inovance / INVT and other domestic vector inverters