14.06.2025 by Viktor Siebert

Expert Repair of Yaskawa MXC Power Cells: A Success Story for Menzel Elektromotoren

For manufacturers of industrial electric motors like Menzel Elektromotoren, precisely functioning test benches are essential for maintaining the highest quality standards. However, in 2024, two critical components failed: the Yaskawa MXC Power Cells, essential elements of modern motor test benches, became non-operational following a facility relocation.

These specialized components (model 7910240-10062), featuring an input voltage of 590 VAC and an output current of 200 A, ensure precise load simulation of electric motors. Without them, comprehensive motor testing was impossible.

Since the original manufacturer no longer provided repair support, Menzel turned to specialized repair experts. The main challenge was crafting custom replacement parts for defective and obsolete current measurement units. After detailed analysis, these components were custom-manufactured, the power cells carefully reconstructed, and extensively tested.

A technician provided on-site support during recommissioning to ensure all components were perfectly integrated and maximum measurement accuracy was achieved. This repair was not only technically challenging but also economically significant, as new units of these components can quickly cost between 15,000 and 30,000 euros each.

Through this successful collaboration, Menzel Elektromotoren saved significant costs, minimized production downtime, and fully restored their test benches. This case impressively highlights the importance of specialized repair services—not only financially but also in terms of sustainable resource use.

Learn more about our Yaskawa repair services here:
Yaskawa Drive repair by Industrypart

Regarding the mentioned unit:
Yaskawa Power Cells 7910240-10062

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Device Specifications (Technical Data)

Specification	Value
Input Voltage	590 VAC (3-phase)
Output Current	200 A
Weight	approx. 80 kg
Manufacturing Date	September 2012

Operating Environment and Compatible Devices

The MXC Power Cells are primarily used in industrial motor test benches and medium-voltage drive systems such as the Yaskawa MV1000. Typically, they operate under the following conditions and configurations:

• Environment: Industrial environments, particularly large motor testing facilities.
• Compatible Devices: Yaskawa MV1000 and other matrix converter systems requiring precise voltage and current control for load simulation of electric motors.

Functional Description

The MXC Power Cells operate as single-phase matrix converters, converting a 3-phase input voltage (590 VAC) into a precisely controlled output voltage and frequency using Pulse Width Modulation (PWM). The integrated Cell Control Board (CCB) receives commands from the main controller and manages the output voltage accordingly. Protective features include overvoltage, undervoltage, and overheating protection for the IGBTs.

Alarm Messages and Troubleshooting (Solutions)

Alarm Code	Description	Possible Causes and Solutions
LIN	Communication fault (link error)	Inspect/replace fiber optic cables, replace CCB or modulator board.
CFA	Snubber DC over-voltage	Check cell input voltage, inspect fuses, replace CCB if necessary.
OC FLT	Overcurrent	Inspect output circuits, check motor insulation, verify acceleration/deceleration times.
SROH FLT	Snubber resistor overheating	Check grid voltage waveform for distortion.
OVER TEMP	Cell overheating	Inspect cooling and fans, clean filters, replace CCB or thermistor if required.
CAP FLT	Capacitor over-voltage	Inspect electrolytic capacitors and replace if necessary.
INVOLT ERR	Input voltage error	Check fuses, inspect IGBT, measure input voltage, replace CCB if needed.
WDT OVR	Hardware fault (Watchdog Timer)	Replace the CCB.