ELAU MC-4/11/50/400 50A PacDrive Servo Drive

The ELAU MC-4/11/50/400 is a high-output digital servo amplifier for PacDrive M automation systems. It supplies one servo axis and combines the motor power stage, DC bus, internal braking resistor, diagnostics, and SERCOS communication in a control-cabinet unit. The 50 A rated output makes it the highest-current standard MC-4 variant in the legacy range.

This model is intended for machines that need substantial continuous motor current or short acceleration peaks. Correct selection depends on the complete type code, the 400 V supply class, motor data, controller configuration, firmware level, cabinet cooling, and EMC design. The 50 A version requires an external mains filter for EMC-compliant installation.

Key Features

• 50 A continuous output for demanding PacDrive M servo applications
• 125 A peak current for short acceleration and load transients
• Integrated DC bus and braking resistor for regenerative energy management
• SERCOS fiber-optic communication with PacDrive M controllers
• Internal temperature-controlled fan and built-in status diagnostics
• Dedicated 24 VDC control supply keeps electronics powered independently of the mains stage

Typical Applications

• High-speed packaging and cartoning machinery
• Large indexing, feeding, and cutting axes
• Servo-driven printing and converting equipment
• Retrofit or replacement in installed PacDrive M machines
• Applications requiring more output than lower-current MC-4 variants

Compatibility and Selection Note

Use the complete type code MC-4/11/50/400 and order number 13130256 when identifying a replacement. Confirm motor compatibility, SERCOS topology, controller project, firmware, cabinet cooling, external mains filter, and incoming 380 to 480 V three-phase supply before installation.

FAQ

Is the MC-4/11/50/400 a multi-axis drive?

No. It is a single-axis servo amplifier. A PacDrive M controller coordinates it with other axes over the SERCOS fiber-optic network.

What is the main difference between this model and the MC-4/11/22/400?

The MC-4/11/50/400 has a 50 A rated output and a 125 A one-second peak, so it serves substantially higher-current motors and loads than the 22 A model.

Can it be connected to a 230 V single-phase supply?

No. This variant is designed for a 380 to 480 V three-phase mains supply. A different PacDrive component is required for 230 V SCL systems.

Does the drive include a braking resistor?

Yes. It has an internal 18 ohm braking resistor rated at approximately 600 W continuous at 45°C and 35 kW peak.

Is an external mains filter required?

Yes. The operating documentation specifies an external mains filter for the 50 A variant when an EMC-compliant installation is required.

What should be checked before replacing an installed unit?

Check the complete type code, order number, motor data, controller project, SERCOS addressing, firmware level, external filter, cabinet cooling, connectors, and machine safety procedure.