The Danfoss VLT® Micro Drive is a frequency converter designed to control the speed of three-phase asynchronous motors, making modern living possible by enabling precise motor control in various applications. This quick guide provides essential information for installation, programming, and troubleshooting the device.
Function Description:
The VLT® Micro Drive is a compact and versatile frequency converter that enables variable speed control of standard three-phase asynchronous motors. It is designed to optimize motor performance, reduce energy consumption, and provide advanced control capabilities. The device accepts AC mains input power and converts it to a variable frequency and voltage output to drive the motor. It supports both single-phase and three-phase mains supply connections, depending on the model.
Key functionalities include:
- Motor Control: Provides precise control over motor speed and torque, allowing for efficient operation in various applications.
- Parameter Programming: Features a Local Control Panel (LCP) for direct programming and monitoring, as well as PC-based software (MCT-10 Set-up Software) for more advanced configuration via an RS485 com-port.
- Digital and Analog Inputs/Outputs: Equipped with multiple digital and analog terminals for external control signals, feedback, and status indications, allowing integration into larger control systems.
- Protective Features: Incorporates comprehensive protection mechanisms against various electrical and operational faults, including overvoltage, undervoltage, overcurrent, short circuits, earth faults, motor overload, and inverter overtemperature.
- Load Sharing/Brake Functionality: Supports load sharing between multiple drives and includes provisions for connecting external brake resistors (not applicable for frame M1) to handle regenerative braking energy.
- Smart Logic Controller (SLC): Offers programmable logic functions to automate specific tasks or sequences based on predefined events and conditions.
- Energy Optimizing: Includes features like AEO Minimum Magnetisation to enhance energy efficiency.
Important Technical Specifications:
The VLT® Micro Drive is available in various frame sizes (M1 to M5) and power ratings, accommodating different motor sizes and supply voltages.
Mains Supply (L1/L, L2, L3/N):
- Supply Voltage: 200-240V ±10% or 380-480V ±10%
- Supply Frequency: 50/60Hz
- Max. Imbalance Temporary between Mains Phases: 3.0% of rated supply voltage
- True Power Factor (λ): ≥ 0.4 nominal at rated load (> 0.98)
- Switching on Input Supply: Maximum 2 times/min.
- Environment according to EN60664-1: Overvoltage category III/pollution degree 2.
- Short Circuit Current Rating: Suitable for use on a circuit capable of delivering not more than 100,000 RMS symmetrical Amperes, 240/480V maximum.
Motor Output (U, V, W):
- Output Voltage: 0-100% of supply voltage
- Output Frequency: 0-200Hz (VVC+), 0-400Hz (u/f)
- Switching on Output: Unlimited
- Ramp Times: 0.05 - 3600sec.
Cable Lengths and Cross Sections:
- Max. Motor Cable Length (screened/armoured for EMC correct installation): 15m
- Max. Motor Cable Length (unscreened/unarmoured): 50m
- Max. Cross Section to Motor, Mains: Varies by frame size (e.g., 4mm²/10 AWG for M1-M3, 16mm²/6 AWG for M4-M5).
- Connection to Load Sharing/Brake (M1, M2, M3): 6.3mm insulated Faston Plugs.
- Connection to Load Sharing/Brake (M4, M5): 16mm²/6AWG.
- Maximum Cross Section to Control Terminals (rigid wire): 1.5mm²/16 AWG (2 x 0.75mm²).
- Maximum Cross Section to Control Terminals (flexible cable): 1mm²/18 AWG.
- Minimum Cross Section to Control Terminals: 0.25mm².
- Number of Programmable Digital Inputs: 5 (1 for pulse/encoder).
- Terminal Numbers: 18, 19, 27, 29, 33.
- Logic: PNP or NPN.
- Voltage Level: 0-24V DC.
- Max. Pulse Frequency at Terminal 33: 5000Hz.
- Number of Analog Inputs: 2 (Terminals 53, 60).
- Voltage Mode (Terminal 53): 0-10V, Input resistance approx. 10 kΩ.
- Current Mode (Terminal 53 and 60): 0/4 to 20 mA (scaleable), Input resistance approx. 200Ω.
- Max. Current: 30mA.
Analog Output:
- Number of Programmable Analog Outputs: 1 (Terminal 42).
- Current Range: 0/4-20mA.
- Max. Load to Common: 500Ω.
- Accuracy: Max. error: 0.8% of full scale.
- Resolution: 8bit.
Control Card, 24 V DC Output:
- Terminal Number: 12.
- Max. Load (M1 and M2): 160mA.
- Max. Load (M3): 30mA.
- Max. Load (M4 and M5): 200mA.
Relay Output:
- Number of Programmable Relay Outputs: 1 (Terminal 01-03).
- Max. Terminal Load (AC-1): 250V AC, 2 A.
- Max. Terminal Load (DC-1): 30V DC, 2 A.
Control Card, 10 V DC Output:
- Terminal Number: 50.
- Output Voltage: 10.5V ±0.5V.
- Max. Load: 25mA.
Surroundings:
- Enclosure: IP 20 (IP 21, TYPE 1 with enclosure kit).
- Vibration Test: 1.0 g.
- Max. Relative Humidity: 5% - 95% (IEC 60721-3-3; Class 3K3 non-condensing).
- Aggressive Environment: Class 3C3 (IEC 60721-3-3), coated.
- Ambient Temperature: Max. 40 °C (derating applies for higher temperatures).
- Minimum Ambient Temperature (full-scale operation): 0 °C.
- Maximum Altitude (without derating): 1000 m.
Usage Features:
- User-Friendly Interface: The Local Control Panel (LCP) features a numeric display, navigation keys (Back, Up/Down arrows, OK), and operation keys (Hand On, Off/Reset, Auto On) for intuitive programming and monitoring.
- Quick Menu Access: Provides quick access to frequently used parameters and settings, simplifying initial setup and common adjustments.
- Comprehensive Main Menu: Allows access to all parameters for detailed configuration and customization.
- Potentiometer (LCP 12): Functions as a local reference control in Hand On mode and as an extra programmable analog input in Auto On mode.
- Flexible Control Modes: Supports control via LCP, control terminals, or serial communication (RS485), offering versatility in integration.
- Digital Inputs for Various Functions: Digital inputs can be configured for functions like Start, Stop, Reset, Reversing, Jog, Preset Reference, and more.
- Relay Output for Status Indication: The programmable relay output can signal various drive statuses such as "Drive ready," "Drive running," "Alarm," or "Warning."
- Side-by-Side Installation: IP 20 rated units can be mounted side-by-side, requiring 100 mm clearance above and below for cooling.
- Multi-Language Support: The manual indicates language codes (Y in MG.02.BX.YY), suggesting support for multiple languages.
Maintenance Features:
- Troubleshooting Guide: The manual includes a detailed "Warnings and Alarms Code list" to help identify and resolve common issues, providing descriptions and causes for various errors (e.g., Live zero error, Mains phase loss, DC overvoltage, Motor ETR over temperature).
- Fuse Recommendations: Provides tables with recommended fuses (Bussmann, Littel fuse, Ferraz-Shawmut) for branch circuit protection and short-circuit protection, ensuring safety and compliance with national/international regulations.
- Disposal Instructions: Emphasizes the importance of separate collection of electrical and electronic waste according to local and valid legislation, promoting environmental responsibility.
- Clearance Requirements: Specifies clearance requirements for cooling (100 mm above and below for IP 20 units), which is crucial for maintaining optimal operating temperatures and preventing overheating.
- Motor Thermal Protection: Features an ETR (Electronic Thermal Relay) function for motor overload protection, configurable via Parameter 1-90.
- Heatsink Temperature Monitoring: Ensures the frequency converter trips in case of overtemperature, protecting the device.
- Easy Terminal Access: Control cable terminals are located underneath a removable terminal cover for straightforward wiring and maintenance.
- Spare Parts Kits: The manual lists various spare parts kits (e.g., M1, M2, M3, M4, M5 frame spare parts kits), indicating availability of components for repair and upkeep.
- Line Filters and Brake Resistors: Danfoss offers optional line filters for improved harmonics performance and brake resistors for handling regenerative energy, which can be integrated for enhanced system reliability and performance.
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