Motors-AC Servo Yaskawa SGMGH Sigma 2 | Repairs Precision Zone

Our Team Expertly Repairs Yaskawa AC Servo Motor SGMGH Sigma 2 Series

Precision Zone specializes in Yaskawa product repairs servicing a wide range of AC Servo series such as Yaskawa SGMGH Sigma 2 Series Motors.

The Sigma Two Series from Yaskawa was next in line following the long lasting service life of the sigma one series. Motion control technology continues to evolve and Yaskawa has been a leader in motion controls since the 1980’s. The SGMGH series of motors was used in a wide range of applications including CNC machines, factory automation and motion controls. This series can be equipped with either an incremental or absolute encoder depending on the demands of the machine. Yaskawa servo motors allow precise movement at high speed with repeatable results.

When assessing the functionality of a motor, our engineering team typically conducts a six-step check:

Visual Overview Check
Static Test
Back EMF
Feedback Check
Alarm Code Troubleshooting
Disassembly and Cleaning

This overview is Precision Zone’s basic troubleshooting process. Once our repair team starts on the job we use specialized, customized test fixtures, SKF Baker AVAIV-4, Huntron tracker, signal generator, oscilloscope, milli and mega ohm meters and other necessary tools to assure quality repair. Most importantly, every repair is fully tested in custom-built simulators under load to replicate real-life working environment.

REPAIR EVALUATION PROCESS FOR SGMGH SIGMA 2 SERVO MOTOR

Visual Overview Check

When conducting a visual check, the technician inspects the motor for any mechanical damage to the power connecter, junction box, rotor shaft, oil seals and encoder covers. During the visual inspection the technician notes excessive dirt, oil or grease on cooling fans and all other parts of the motor.

Static Test Basic

Precision Zone repair technicians use an SKF Baker Advanced Winding Analyzer to fully evaluate the stator winding. The SKF Baker performs a wide range of electrical tests, including surge, DC hipot, meg-Ohm and winding resistance tests. In the instance of winding resistance each phase is tested with each other; and the mega ohm readings should be no less than 300 mega ohms.

Winding Resistance Testing

Multimeter Positive Lead	Multimeter Negative Lead	Resistance Check
U	V	Approximately 0.13-14.0 Ohm’s
U	W	Approximately 0.13-14.0 Ohm’s
V	W	Approximately 0.13-14.0 Ohm’s

Reading should be balanced across all three phases. These readings will vary depending on the kW size of the motor.

Mega Ohm Testing

Mega Ohm Meter Negative Lead	Mega Ohm Meter Positive Lead	Insulation Check
Ground	U V W	Must be above 300 Mega Ohms

Back EMF Check

If a servo motor passes the static checks it will be back driven and have the back EMF checked. With our in house magnetizing service we can bring back to life servo motors with weak magnets.

Feedback Check

Repair technicians can test encoders in a number of different ways. Our Mitchell Electrics TI-5000EX system can be used to read, write and record encoder count and data information. We have Mitchell Electrics TI-5250 systems that can be used to see live encoder pulses on an oscilloscope. Connecting encoders directly to the manufacture’s drive is another way we can verify if an encoder is working correctly.

Alarm Codes Troubleshooting

Alarms that the Sigma 2 Series Servopack will display when the SGMGH Sigma 2 Series Motors have a problem are the following. These codes displayed are :

Alarm Code	Code Type
A.10	Overcurrent
A.51	Overspeed
A.71	Overload: High Load
A.72	Overload: Low Load
A.80	Absolute Encoder Error
A.81	Absolute Encoder Backup Error
A.84	Absolute Encoder Data Error
A.82	Absolute Encoder Checksum Error
A.C9	Encoder Communications Error
A.00	Absolute data error

Disassembly and Cleaning

All motors are fully dissembled washed and baked. Rotors are checked for bent shafts and bearing journal common problems. The stator winding is rechecked after the baking process. Holding brakes are refurbished and the holding torque is checked. Both the drive end and opposite drive end housing bearing surfaces are checked. Once the evaluation is completed a computer report is generated with all the findings.

Recently Repaired Products

SGMGH-44ACA6E is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Worn Brake Needs Reconditioning, Bad Encoder, Bad ODE Bearing, Worn ODE Housing, Bad Condition - Requires Reconditioning, Bad Encoder Bearings, Bad DE Bearing
Servomotor Type: SGMGH Sigma II
Rated Output: 4.4kW; 1500RPM
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: 24VDC Brake and Shaft Seal

SGMGH-1EDCA6C is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Incorrect Feed Back Alignment
Servomotor Type: SGMGH Sigma II
Rated Output: 15.0kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: 24VDC Brake

SGMGH-1EDCA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Incorrect Feed Back Alignment, Bad Encoder
Servomotor Type: SGMGH Sigma II
Rated Output: 15.0kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Standard

SGMGH-44QCA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning
Servomotor Type: SGMGH Sigma II
Rated Output: 4.4kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Standard

SGMGH-44DCA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning
Servomotor Type: SGMGH Sigma II
Rated Output: 4.4kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Standard

SGMGH-09ACA6S is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Encoder Cover, Bad ODE Bearing
Servomotor Type: SGMGH Sigma II
Rated Output: 850W; 1500RPM
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Shaft Seal

SGMGH-20ACA6E is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Worn ODE Housing, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGMGH Sigma II
Rated Output: 1.8kW; 1500RPM
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: 24VDC Brake and Shaft Seal

SGMGH-13ACA6S is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Feed Back Connector, Bad ODE Bearing, Bad Power Connector
Servomotor Type: SGMGH Sigma II
Rated Output: 1.3kW; 1500RPM
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Shaft Seal

SGMGH-1AD2A61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Incorrect Feed Back Alignment, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Bad Power Connector
Servomotor Type: SGMGH Sigma II
Rated Output: 11.0kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Absolute Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Standard

SGMGH-1ADCA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Encoder Bearings, Bad ODE Bearing, Bad Power Connector, Worn ODE Housing
Servomotor Type: SGMGH Sigma II
Rated Output: 11.0kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Standard

SGMGH-75DCA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Encoder Bearings, Bad ODE Bearing, Worn DE Housing, Worn ODE Housing
Servomotor Type: SGMGH Sigma II
Rated Output: 7.5kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Standard

SGMGH-30ACA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Incorrect Feed Back Alignment
Servomotor Type: SGMGH Sigma II
Rated Output: 2.9kW; 1500RPM
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Standard

SGMGH-1AD2A6C is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Worn Brake Needs Reconditioning
Servomotor Type: SGMGH Sigma II
Rated Output: 11.0kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Absolute Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: 24VDC Brake

SGMGH-75D2A6C is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Brake, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Worn ODE Housing, Bad Encoder Bearings
Servomotor Type: SGMGH Sigma II
Rated Output: 7.5kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Absolute Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: 24VDC Brake

SGMGH-55ACA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning
Servomotor Type: SGMGH Sigma II
Rated Output: 5.5kW; 1500RPM
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Standard

SGMGH-30ACA6C is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Worn ODE Housing
Servomotor Type: SGMGH Sigma II
Rated Output: 2.9kW; 1500RPM
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: 24VDC Brake

SGMGH-44ACA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad ODE Bearing, Bent Shaft - Encoder Mounting Side, Worn DE Housing, Worn ODE Housing, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Encoder, Bad Encoder Bearings
Servomotor Type: SGMGH Sigma II
Rated Output: 4.4kW; 1500RPM
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Standard

SGMGH-30D2A6C is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Brake Connector, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGMGH Sigma II
Rated Output: 2.9kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Absolute Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: 24VDC Brake

SGMGH-55D2A6C is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Brake, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGMGH Sigma II
Rated Output: 5.5kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Absolute Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: 24VDC Brake

SGMGH-1ED2A6C is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Feed Back Connector, Bad ODE Bearing, Worn Brake Needs Reconditioning, Worn DE Housing, Worn ODE Housing
Servomotor Type: SGMGH Sigma II
Rated Output: 15.0kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Absolute Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: 24VDC Brake

SGMGH-30DCA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Worn DE Housing, Worn ODE Housing
Servomotor Type: SGMGH Sigma II
Rated Output: 2.9kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Standard

SGMGH-30D2A2B is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Broken Shaft, Worn Brake Needs Reconditioning, Worn DE Housing, Worn ODE Housing
Servomotor Type: SGMGH Sigma II
Rated Output: 2.9kW; 1500RPM
Power Supply: 400V
Encoder Specifications: 17-bit Absolute Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight without key
Accessories: with 90VDC brake

SGMGH-09ACA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Power Connector, Bad Coil Insulation - Due to Coolant/Moisture Contamination, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGMGH Sigma II
Rated Output: 850W; 1500RPM
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Standard

SGMGH-20ACA6S is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Worn DE Housing
Servomotor Type: SGMGH Sigma II
Rated Output: 1.8kW; 1500RPM
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Design revision order: Standard for 1500 RPM
Shaft Specifications: Straight with key and tap
Accessories: Shaft Seal