KEB 17F5A1G-350A Combivert Drive: High-Power 18.5kW Axis Controller

Command heavy machinery with precision. The KEB 17F5A1G-350A is a robust 18.5kW axis drive featuring field-oriented control and a high 75A peak current for demanding industrial motion applications.

Key Features for Heavy-Duty Motion Control

• High Power Output: 18.5 kW rating for large motors and high-inertia loads.
• Advanced Motor Control: Field-oriented control (FOC) and synchronous motor control for superior performance.
• High Overload Capacity: 75 A maximum current handles intense peak demands.
• Flexible Configuration: Configurable 4/16 kHz switching frequency and programmable digital inputs.
• Sensorless Option: Supports KEB-SMM (Sensorless Motor Management) to eliminate encoder feedback.

Complete Technical Specifications

Brand: KEB Automation

Series: Combivert F5 Axis Drive Series

Model: 17F5A1G-350A (17.F5.C1G-350A)

Rated Output Power: 18.5 kW

Rated Output Current (In): 42 A

Maximum Output Current (Imax): 75 A

Input Voltage: 3-Phase, 400V AC

Control Technology: Field-Oriented Control, Synchronous Motor Control

Sensor Feedback: Supports encoder feedback and KEB-SMM sensorless control.

Switching Frequency: Configurable 4 kHz or 16 kHz

Digital Inputs: 8 programmable inputs

Analog Inputs: 2 (0-10V, ±10V, 0/4-20 mA)

EMC Classification: Category C1 (for industrial environments)

EMC Standards: EN 61800-3 (Emissions), EN 61800-2, EN 61800-5-1 (Safety)

Protection Rating: IP20 / VBG 4

Operating Temperature: -10°C to +45°C

Storage Temperature: -25°C to +70°C

Cooling: Requires adequate forced air cooling for this power level.

FAQ – High-Power System Design

When should I use the 4 kHz vs. 16 kHz switching frequency?

Use 4 kHz for highest efficiency and cooler drive operation with standard motors. Use 16 kHz for quieter motor operation (reduced whine) and when controlling motors with special laminations designed for higher frequencies.

What is the main advantage of field-oriented control (FOC)?

FOC provides independent control of motor torque and flux, like a DC motor. This results in full torque at zero speed, excellent dynamic response, and higher efficiency across the speed range.

Is an external braking resistor required?

Absolutely. An 18.5kW drive requires a substantial external braking resistor bank to dissipate braking energy. The internal DC bus capacitor alone cannot handle it.

Can I use this drive without an encoder?

Yes, using KEB's Sensorless Motor Management (SMM). It provides good speed control but may not match the very low speed or high dynamic performance of an encoder-based system. Choose based on your application's needs.

What size of power cables and protection are needed for 42A input?

You need heavy-gauge cables (e.g., 10 AWG or larger per local code), a three-phase circuit breaker and contactor rated for at least 50-60A, and likely a line reactor to protect against power line disturbances.

Package & Service Information

Package Includes: 1 x KEB 17F5A1G-350A Combivert F5 High-Power Drive Unit.

Warranty: This industrial drive is covered by a 12-month warranty.

Shipping: Available for global delivery via FedEx, UPS, and DHL freight services.

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