The Lenze i550 protec frequency inverter is a robust and versatile device designed for controlling the speed and torque of electric motors in various industrial applications. It supports a power range from 0.37 kW to 75 kW, making it suitable for a wide array of machinery.
Function Description
The i550 protec frequency inverter offers comprehensive motor control functionalities, including V/f characteristic control, sensorless vector control (SLVC), and sensorless vector control (SL-PSM) for permanent magnet synchronous motors. It can be operated via a keypad module, WLAN module, or through an engineering tool like "EASY Starter" via a micro USB port. The device supports various communication networks such as CANopen, Modbus RTU, IO-Link, EtherCAT, EtherNet/IP, Modbus TCP, and PROFINET, allowing for flexible integration into existing control systems.
Key functional features include:
- Control Selection: Flexible assignment of start, stop, and rotating direction commands with digital signal sources. Motor can be started exclusively via the keypad's start key, or setpoints can be defined via analog inputs or network process data objects.
- Start Methods: Options include normal start with standard ramps, DC braking, flying restart circuit, and premagnetization. Premagnetization reduces motor current and smooths acceleration during startup, particularly in V/f motor control mode.
- Stop Methods: The inverter supports coasting (motor coasts down to standstill), standard ramp (motor brought to standstill with deceleration time 1), quick stop ramp (motor brought to standstill with a configurable quick stop deceleration time), and switch-off positioning (motor brought to a relatively constant stop position by delaying the down-ramping).
- Integrated Functional Safety: Certain variants support "Safe Torque Off (STO)" in accordance with machinery directives, ensuring safe shutdown of the motor.
- Preset Frequencies: Up to 15 preset frequency values can be parameterized and selected, offering quick and easy adjustment for different operating conditions.
- Analog I/O: Configurable analog inputs (AI1, AI2) for voltage or current signals, and an analog output (AO1) for voltage or current, allowing for flexible setpoint and feedback integration.
- Digital I/O: Multiple digital inputs (DI1-DI5) for various control commands (Run, Reset error, Change rotating direction, Activate preset bits) and a digital output (DO1) for status indications (e.g., "releasing the brake").
- PTC Input: Dedicated input for PTC or KTY thermal sensors to monitor motor temperature, providing an additional layer of protection.
- Relay Output: A relay output (X9) provides status feedback such as "Running," "Ready for operation," "Operation enabled," "Stop active," "Error active," and "Device warning active."
Important Technical Specifications
The i550 protec frequency inverter is available in different variants based on mains voltage, connection type, rated power, degree of protection, and product extension.
- Rated Power: 0.37 kW to 75 kW.
- Mains Voltage and Connection Type:
- 1/N/PE AC 120 V
- 1/N/PE AC 230/240 V
- 3/PE AC 230/240 V
- 3/PE AC 400 V
- 3/PE AC 480 V
- 3/PE AC 600 V
- Degree of Protection:
- IP31, uncoated / NEMA 1
- IP66, uncoated / NEMA 4X
- IP55, uncoated / NEMA 12
- Interference Suppression: Available with or without an integrated RFI filter.
- Application Area: Default parameter settings for EU (50-Hz networks) or US (60-Hz networks).
- Cable Cross-Sections:
- Mains cable: M20 / ¾" Conduit hub (0.37-2.2 kW), M32 / 1" Conduit hub (3-11 kW), M40 / 1¼" Conduit hub (15-22 kW), M63 / 2" Conduit hub (30-75 kW).
- Control, network, brake resistor cables: 2x M12, 2x M16, 2x M20, 2x M25, 2x M32, 2x M40, 2x M50.
- Tightening Torque for Terminals: 0.5 Nm for control terminals, 2 Nm for PE connection, 0.5-2 Nm for mains and motor connections depending on power.
- Fuse Protection: Max. rated current up to 200 A (gG/gL or gRL characteristic), Max. short-circuit current (SCCR) up to 10 kA. Circuit breakers with B characteristic are recommended.
- Residual Current Device (RCD): ≥ 30 mA, type B.
- Operating Temperature: 0 to +45 °C (up to +60 °C with derating).
- Humidity: 3K3 (30 - +60 °C).
- Overload Capacity: Light Duty (167 % for 3 s, 125 % for 60 s), Heavy Duty (200 % for 3 s, 150 % for 60 s).
Usage Features
The i550 protec inverter is designed for ease of use and installation, with several features enhancing its applicability:
- Compact Design: The dimensions vary by power, but the overall design aims for space efficiency. For example, a 0.37 kW 1-phase 120 V device measures 190x140x117 mm (HxWxD).
- Extension Box: For 0.37 to 22 kW models, an IP66 housing with an enlarged extension box can be ordered. This box provides additional space for cable entries, integration of terminals for looping through mains voltage, control elements, or a brake rectifier for holding brakes.
- Keypad Module: An intuitive keypad module allows for local operation, parameter setting, and diagnostics. It features keys for navigation, parameter alteration, confirmation, saving settings, activating keypad control, starting/stopping the motor, and changing rotation direction.
- SMART Keypad App: A mobile app for Android and iOS devices enables wireless diagnosis and parameterization via a WLAN module, ideal for simple applications like conveyor belts.
- Engineering Tool: The "EASY Starter" engineering tool provides comprehensive commissioning and diagnostics capabilities via a standard USB cable.
- EMC Compliance: The drive system is designed to comply with EMC Directive 2014/30/EU, requiring sufficient conductive shield connections, proper grounding, and RFI filters. For inverters > 30 kW, an EMC filter (ferrite core) is installed in the terminal box if the motor cable length exceeds 15 m.
- Brake Resistor Connection: Supports both short (<0.5 m) and long (max. 5 m) connection cables for brake resistors, with recommendations for shielding and twisting to reduce EMC interference. Protection against overload is crucial and can be achieved through suitable parameterization or by using intrinsically safe brake resistors.
Maintenance Features
Maintenance and troubleshooting are facilitated by built-in diagnostic tools and clear instructions:
- Error Message Display: The keypad displays detailed error messages, including error text, type (fault, trouble, warning), and hexadecimal code, aiding in quick identification of issues.
- LED Status Indicators: Status LEDs ("RDY" for blue, "ERR" for red) provide visual feedback on the inverter's operational state, including power supply, initialization, STO activity, warnings, errors, and DC bus voltage. Separate LEDs for network status (CANopen, EtherCAT, EtherNet/IP, Modbus RTU, Modbus TCP, PROFINET, IO-Link) indicate communication status.
- Error Reset: Errors can be reset via the keypad (stop key) or terminal control (start signal or dedicated error reset signal), provided the cause of the error has been eliminated.
- Product Information: Further support and product information can be found on the Lenze online page and via a QR code provided in the manual. The material number on the nameplate also helps in identifying the product for support.
- Disposal Information: Clear guidelines for proper disposal of the device and its components, emphasizing separation from unsorted municipal waste and recycling of packaging materials.
The Lenze i550 protec frequency inverter is a reliable and adaptable solution for modern drive tasks, offering a balance of performance, safety, and user-friendliness.
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