19.06.2025 by Viktor Siebert

A few weeks ago, a concerned customer contacted us. His Yaskawa Servopack SGDM-50ADAY457 had failed, and despite several repair attempts at another workshop, the device simply would not function. The service provider eventually resorted to what they called a solution: they supplied a replacement device – supposedly new, and sourced directly from China.

A Supposedly New Device – But a Total Letdown

Once the “new” device was installed, massive issues surfaced. It couldn’t be parameterized, threw out cryptic error codes, and refused to integrate properly with the machine’s control system. Production remained at a standstill.

In his frustration, the customer brought us both devices – the original Servopack and the so-called replacement. Within minutes, our head technician made a sobering discovery.

A Label Fraud from the Far East

We found that the replacement device, while visually identical from the outside, was an entirely different model on the inside. The type label had been altered, and the internal components didn’t match the original. Sadly, this is not uncommon: refurbished and relabeled devices from China are often sold as “new” – even by repair providers who can’t tell the difference.

Why This Device Could Never Work

Thanks to our extensive internal database – built from thousands of photos, videos, and circuit diagrams – we were able to accurately identify the original unit and compare it with the fake. The differences were dramatic: incorrect PCBs, incompatible firmware versions, and completely different electrical characteristics. No wonder the machine couldn’t be configured or operated properly.

The Real Damage: Over-Repaired Instead of Properly Repaired

What made the situation worse: the original device could have been repaired with targeted measures. But in the previous workshop, it was essentially “over-repaired” to death – incorrect components soldered in, PCB traces damaged, ICs desoldered and never replaced. The assumption seemed to be that the replacement would work anyway – which it clearly didn’t. In the end, we had to replace the entire power board, which was beyond repair.

A Proper Diagnosis Saves the Day

We completed the full repair in less than a week. The customer was relieved – not only because of the quick turnaround but because of the clear explanation and our technical transparency. The damage was minimized. He was even able to return the faulty replacement device and recover the €3,000 he had spent on it.

Conclusion: Quality, Experience, and Honesty Make the Difference

In today’s market, more and more so-called “experts” are tinkering with highly complex drive electronics without proper knowledge. This is especially dangerous with brands like Yaskawa, whose sophisticated control and power electronics require expertise.

At Industrypart GmbH, we rely on transparent diagnostics, verifiable repair histories, and genuine technical know-how – backed by our proprietary databases and decades of experience. This case once again proves: choosing the wrong provider or chasing a cheap deal can cost far more in the end – in money, time, and lost production.

Further information such as price and delivery time for:
Yaskawa Servopack SGDM-50ADAY457

More details about our Yaskawa repair expertise can be found here: Yaskawa SIGMA II repairs by Industrypart

Similar models we regularly repair:
SGDM-50ADA

📞 Please feel free to contact us if you have any questions regarding your Omron drive technology. Our experienced team is always available to assist you.

Device Specifications (Electrical & Physical)

Parameter	Value
Model	SGDM-50ADAY457
AC Input	3-phase, 200–230 V, 50/60 Hz, 28 A
AC Output	3-phase, 0–230 V, 0–300 Hz, 32.8 A
Output Power	5.0 kW
Operating Temperature	0–55 °C
Weight	approx. 4.6 kg

Application Environment & Compatibility

The SGDM-50ADAY457 is part of the Σ-II Series and typically used in:

• Industrial automation: such as CNC machines, packaging equipment, and robotic systems
• Compatible Motors: Especially suitable for SGMGH motors with 5.0 kW power output
• Installation: Cabinet-mounted, with sufficient ventilation and low vibration exposure
• Permissible Humidity: 20–90% RH (non-condensing)

Functional Description

The SGDM-50ADAY457 is a digital AC servo amplifier module that offers:

• Speed, position, and torque control for Yaskawa AC servomotors
• Built-in regenerative processing to dissipate excess energy
• Extensive self-diagnosis functions including error memory
• Interface via digital operator (e.g. JUSP-OP02A-2) or PC software
• Support for absolute and incremental encoders
• Multiple protective features: overvoltage, overheating, short circuits, etc.

Alarm Messages & Troubleshooting (Selection)

Alarm Code	Description	Cause	Solution
A.02	Parameter data error (EEPROM failure)	Interrupted power during parameter write	Initialize with Fn005 or replace the SERVOPACK
A.10	Overcurrent or heat sink overheat	Short circuits, improper wiring, thermal overload	Check wiring and grounding, replace SERVOPACK or motor cables
A.30	Regeneration error detected	Missing or incorrectly wired regenerative resistor	Connect external resistor properly or replace SERVOPACK
A.33	Main circuit power wiring error	Wrong input mode (AC instead of DC or vice versa)	Check Pn001 setting and power supply type
A.51	Overspeed	Incorrect phase order, encoder noise or wiring issues	Verify encoder and motor wiring, shield cables
A.71 / A.72	Overload (instantaneous / continuous)	Excessive load or wiring errors	Reassess load conditions or servomotor capacity
A.81	Encoder backup power error	Dead or disconnected battery (absolute encoder)	Check or replace battery, reinitialize encoder if needed
A.C9	Encoder communication error	Wiring issue, noise, or cable damage	Check shielding, wiring length, and routing
A.F1	Open phase in power supply	One phase of the 3-phase supply is disconnected	Verify and correct input power wiring