6SL3210-1KE14-3AB2

What is this drive used for?

It is a compact variable frequency drive (VFD) designed to control the speed and torque of three-phase AC motors. Typical applications include conveyors, fans, pumps, mixers, and general-purpose machinery where adjustable motor speed is required.

What supply voltage does it require?

It is intended for a three-phase AC supply in the range 380 to 480 V (with +10% / -20% tolerance) at 47 to 63 Hz.

What motor power range does it cover?

It is rated at 1.50 kW in Low Overload (LO) duty and 1.10 kW in High Overload (HO) duty. This allows you to select the duty mode based on whether the application needs higher intermittent torque or more continuous running.

What is the difference between Low Overload (LO) and High Overload (HO)?

LO is aimed at variable-torque loads (such as fans and pumps) and provides 150% overload for 3 seconds, then 110% for 57 seconds (within a 300-second cycle). HO is aimed at higher-demand loads and provides 200% overload for 3 seconds, then 150% for 57 seconds (within a 300-second cycle).

What output frequency range can it provide?

With sensorless vector control, the output frequency range is 0 to 240 Hz. With V/f control, the output frequency range is 0 to 550 Hz.

Which control methods are available?

It supports V/f control (linear, square-law, and parameterisable), V/f with flux current control (FCC), V/f ECO (linear and square-law), and sensorless vector control. It does not support vector control with an encoder.

Does it support Modbus communication?

Yes. Communication is via USS / MODBUS RTU over an RS485 interface, which is commonly used for simple integration into PLC or SCADA systems.

How many I/O points are available for basic control and signalling?

It provides 6 standard digital inputs and 1 fail-safe digital input. For outputs, it includes 1 relay changeover output (30 V DC, 0.5 A resistive) and 1 transistor output (30 V DC, 0.5 A resistive). It also has 1 analogue/digital differential input (10-bit) and 1 analogue output (non-isolated).

Can it accept a motor temperature sensor input?

Yes. It includes a PTC/KTY motor temperature sensor input and supports PTC, KTY, and Thermo-Click sensors (stated accuracy ±5 °C).

Is an EMC filter built in?

Yes. It includes an integrated filter classified as Class A.

What enclosure protection rating does it have?

It is rated IP20 / UL open type, meaning it is intended to be installed within a suitable electrical enclosure.

What are the key physical dimensions and weight?

The unit is approximately 73 mm (W) × 173 mm (H) × 155 mm (D) and has a net weight of about 1.40 kg.

What are the operating environmental limits?

Operation is specified from -10 to 40 °C with up to 95% relative humidity at 40 °C (no condensation or icing). Installation altitude is specified up to 1,000 m. Cooling is by an integrated fan with a cooling air requirement of 0.005 m³/s.

What cable lengths and shielding guidelines apply to the motor connection?

Maximum motor cable length is 50 m when shielded and 100 m when unshielded. The maximum line length is specified as 15 m.

What conductor sizes are supported on the terminals?

Signal wiring supports 0.15 to 1.50 mm². Power terminals on the line side, motor side, and DC link (for braking resistor connection) support 1.00 to 2.50 mm² using plug-in screw terminals.

Can a braking resistor be connected?

Yes. The drive provides DC link terminals intended for connection of a braking resistor, allowing improved handling of regenerative energy in deceleration-intensive applications.

What efficiency and noise figures should I expect?

Typical efficiency is stated as 0.97, with power loss around 61.9 W. The sound pressure level is stated as 49 dB at 1 m.

What standards and approvals does it conform to?

Compliance is stated for CE, cUL, UL, KC, EAC, and C-Tick (RCM). This can be useful for equipment builds intended for multiple regions; always confirm suitability for the specific machine and installation context.

How do I decide if this drive is suitable for a 1.5 kW motor?

Match the motor’s voltage (typically 400 V class), check the application duty (LO vs HO), and confirm the motor full-load current is within the drive’s rated output current for the selected duty. For reference, output rated current is 4.10 A (LO) or 3.10 A (HO), with a maximum output current of 6.20 A; these values correspond to the Siemens 6SL3210-1KE14-3AB2 data.