Motors-AC Servo Yaskawa SGMG Sigma 1 | Repairs Precision Zone

Our Team Expertly Repairs Yaskawa AC Servo Motor SGMG Sigma 1 Series

Precision Zone specializes in Yaskawa product repairs servicing a wide range of AC Servo series such as Yaskawa SGMG Sigma 1 Series Motors.

The Sigma One Series from Yaskawa was on the leading edge of motion control technology in the 1990’s and Yaskawa continues to be a leader in motion controls. The SGMG 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, 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 SGMG SERIES 1 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 0.03-5.0 Ohm’s
U	W	Approximately 0.03-5.0 Ohm’s
V	W	Approximately 0.03-5.0 Ohm’s

Reading should be balanced across all three phases.

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 1 Series Servopack will display when the SGMG Sigma 1 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

SGMG-05A2AB is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Coil Insulation, Bad Coil Resistance, Bad DE Bearing, Bad Encoder Bearings, Bad ODE Bearing, Winding Overheated
Servomotor Type: SGMG
Rated Output: 0.5kW (0.60HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: Standard

SGMG-75A2AB is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Encoder Bearings, Bad ODE Bearing, Worn ODE Housing
Servomotor Type: SGMG
Rated Output: 7.5kW (10HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: Standard

SGMG-20A2AB is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Power Connector, Bad Encoder, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Worn DE Housing
Servomotor Type: SGMG
Rated Output: 2.0kW (2.7HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: Standard

SGMG-1AASABC 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
Servomotor Type: SGMG
Rated Output: 11.0kW (15HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 15-bit (8192 P/R) Absolute Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: 24 VDC Brake

SGMG-1AA2ABC is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Encoder, Bad Encoder Cover, Bad Feed Back Connector, Bad ODE Bearing, Missing parts/components, Worn Brake Needs Reconditioning, Worn ODE Housing
Servomotor Type: SGMG
Rated Output: 11.0kW (15HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: 24 VDC Brake

SGMG-13A2ABC is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Encoder
Servomotor Type: SGMG
Rated Output: 1.3kW (1.7HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: 24 VDC Brake

SGMG-44A2ABC is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Power Connector, Passed Testing - Highly Recommend Recondition
Servomotor Type: SGMG
Rated Output: 4.4kW (6.0HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: 24 VDC Brake

SGMG-20A2A is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGMG
Rated Output: 2.0kW (2.7HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Standard (straight without key, when options blank)
Options: Standard

SGMG-30A6A 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: SGMG
Rated Output: 3.0kW (4.0HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 4096 P/R Incremental Encoder (standard)
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Standard (straight without key, when options blank)
Options: Standard

SGMG-30ASA is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Incorrect Feed Back Alignment, Worn ODE Housing, Bad Encoder
Servomotor Type: SGMG
Rated Output: 3.0kW (4.0HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 15-bit (8192 P/R) Absolute Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Standard (straight without key, when options blank)
Options: Standard

SGMG-30ASRAB is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Encoder, Bad Brake, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGMG
Rated Output: 3.0kW (4.0HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 15-bit (8192 P/R) Absolute Encoder
Rated Speed: 1500 RPM
Shaft Specifications: Standard (straight without key, when options not blank)
Options: 90 VDC Brake

SGMG-09A2ADS is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGMG
Rated Output: 0.9kW (1.2HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Taper 1/10 with Woodruff key (05 and 09 only)
Options: Oil seal

SGMG-30A2AB is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Worn DE Housing, Worn ODE Housing, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Incorrect Feed Back Alignment, Bad Oil Seal
Servomotor Type: SGMG
Rated Output: 3.0kW (4.0HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: Standard

SGMG-75ASABC is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Power Connector, Bad Brake, Bad DE Bearing, Bad Encoder, Bad ODE Bearing, Worn ODE Housing, Bad Condition - Requires Reconditioning
Servomotor Type: SGMG
Rated Output: 7.5kW (10HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 15-bit (8192 P/R) Absolute Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: 24 VDC Brake

SGMG-09A2AAB is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder, Bad ODE Bearing
Servomotor Type: SGMG
Rated Output: 0.9kW (1.2HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Standard (straight without key, when options not blank)
Options: 90 VDC Brake

SGMG-20A2ABS is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Bad Encoder Bearings, Worn DE Housing, Worn ODE Housing
Servomotor Type: SGMG
Rated Output: 2.0kW (2.7HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: Oil seal

SGMG-09A2ABS is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing, Passed Testing - Highly Recommend Recondition
Servomotor Type: SGMG
Rated Output: 0.9kW (1.2HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: Oil seal

SGMG-20ASA is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Encoder, Bad Encoder Bearings, Bad ODE Bearing
Servomotor Type: SGMG
Rated Output: 2.0kW (2.7HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 15-bit (8192 P/R) Absolute Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Standard (straight without key, when options blank)
Options: Standard

SGMG-1EA2AB is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Encoder, Bad ODE Bearing, Worn ODE Housing, Incorrect Feed Back Alignment
Servomotor Type: SGMG
Rated Output: 15.0kW (20HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Straight with key and one shaft-end tap
Options: Standard

SGMG-13A2AAS is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGMG
Rated Output: 1.3kW (1.7HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Standard (straight without key, when options not blank)
Options: Oil seal

SGMG-30A2AAG is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Incorrect Feed Back Alignment, Worn Brake Needs Reconditioning
Servomotor Type: SGMG
Rated Output: 3.0kW (4.0HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Standard (straight without key, when options not blank)
Options: 24 VDC brake, Oil seal

SGMG-20A2BAB is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing, Worn Brake Needs Reconditioning, Worn ODE Housing
Servomotor Type: SGMG
Rated Output: 2.0kW (2.7HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1000 RPM
Shaft Specifications: Standard (straight without key, when options not blank)
Options: 90 VDC Brake

SGMG-09A2AAS is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Broken DE Housing, Worn ODE Housing, Bad Oil Seal, Bad Coil Insulation - Due to Coolant/Moisture Contamination, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGMG
Rated Output: 0.9kW (1.2HP)
Power Supply: 200V Standard Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Standard (straight without key, when options not blank)
Options: Oil seal

SGMG-44V2AAS is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Encoder, Bad ODE Bearing, Worn DE Housing
Servomotor Type: SGMG
Rated Output: 4.4kW (6.0HP)
Power Supply: CE European Configuration
Encoder Specifications: 8192 P/R Incremental Encoder
Rated Speed: 1500 RPM (CE SPEC ONLY: 200V)
Shaft Specifications: Standard (straight without key, when options not blank)
Options: Oil seal