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

Our Team Expertly Repairs Yaskawa AC Servo Motor Sigma 1 Series

Precision Zone specializes in Yaskawa product repairs servicing a wide range of AC Servo series such as Yaskawa SGM 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 SGM series of motors where used in smaller applications such as EDM machines. 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 SGM 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	U
Multimeter Negative Lead	V
Resistance Check	Approximately 0.8-14.0 Ohm’s

Multimeter Positive Lead	U
Multimeter Negative Lead	W
Resistance Check	Approximately 0.8-14.0 Ohm’s

Multimeter Positive Lead	V
Multimeter Negative Lead	W
Resistance Check	Approximately 0.8-14.0 Ohm’s

Reading should be balanced across all three phases.

Mega Ohm Testing

Mega Ohm Meter Negative Lead	Ground
Mega Ohm Meter Positive Lead	U V W
Insulation Check	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 SGM 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

SGM-08AW14S is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder, Bad ODE Bearing
Servomotor Type: SGM
Rated Output: 750W (1.0HP)
Power Supply: 200V Standard
Encoder Specifications: 12-bit (1024 P/R) Absolute Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Straight with keyway
Options: Shaft Seal

SGM-08U3B4L is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGM
Rated Output: 750W (1.0HP)
Power Supply: 200V UL Recognized
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: UL Recognized
Shaft Specifications: Straight with keyway
Options: Standard

SGM-08A316S is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Coil Insulation - Due to Coolant/Moisture Contamination, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Encoder, Bad ODE Bearing
Servomotor Type: SGM
Rated Output: 750W (1.0HP)
Power Supply: 200V Standard
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Straight with key and tap
Options: Shaft Seal

SGM-04A314 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: SGM
Rated Output: 400W (0.5HP)
Power Supply: 200V Standard
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Straight with keyway
Options: None

SGM-04U3B4L is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing, Worn ODE Housing
Servomotor Type: SGM
Rated Output: 400W (0.5HP)
Power Supply: 200V UL Recognized
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: UL Recognized
Shaft Specifications: Straight with keyway
Options: Standard

SGM-08A314 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGM
Rated Output: 750W (1.0HP)
Power Supply: 200V Standard
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Straight with keyway
Options: None

SGM-A5L3B2L is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder, Bad ODE Bearing, Bad Power Connector
Servomotor Type: SGM
Rated Output: 50W (0.07HP)
Power Supply: 100V UL Recognized
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: UL Recognized
Shaft Specifications: Staight without keyway
Options: Standard

SGM-08A314B is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Brake, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad Encoder, Bad Encoder Bearings, Bad ODE Bearing
Servomotor Type: SGM
Rated Output: 750W (1.0HP)
Power Supply: 200V Standard
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Straight with keyway
Options: 90VDC Brake

SGM-04A312 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing, Passed Testing - Highly Recommend Recondition
Servomotor Type: SGM
Rated Output: 400W (0.5HP)
Power Supply: 200V Standard
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Staight without keyway
Options: None

SGM-01A312 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Incorrect Feed Back Alignment, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGM
Rated Output: 100W (0.13HP)
Power Supply: 200V Standard
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Staight without keyway
Options: None

SGM-01U3B4L is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder Bearings, Bad ODE Bearing, Bad Coil Insulation
Servomotor Type: SGM
Rated Output: 100W (0.13HP)
Power Supply: 200V UL Recognized
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: UL Recognized
Shaft Specifications: Straight with keyway
Options: Standard

SGM-02AW12 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder, Bad ODE Bearing, Bent Shaft - Encoder Mounting Side
Servomotor Type: SGM
Rated Output: 200W (0.25HP)
Power Supply: 200V Standard
Encoder Specifications: 12-bit (1024 P/R) Absolute Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Staight without keyway
Options: None

SGM-01B314 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder, Bad ODE Bearing, Bad Power Connector, Broken Shaft, Worn Shaft Keyway
Servomotor Type: SGM
Rated Output: 100W (0.13HP)
Power Supply: 100V Standard
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Straight with keyway
Options: None

SGM-01A314C is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Coil Insulation, Bad DE Bearing, Bad ODE Bearing, Worn Brake Needs Reconditioning
Servomotor Type: SGM
Rated Output: 100W (0.13HP)
Power Supply: 200V Standard
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Straight with keyway
Options: Standard with 24VDC Brake

SGM-04UWB4L is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing, Bad Encoder
Servomotor Type: SGM
Rated Output: 400W (0.5HP)
Power Supply: 200V UL Recognized
Encoder Specifications: 12-bit (1024 P/R) Absolute Encoder
Revision Level: UL Recognized
Shaft Specifications: Straight with keyway
Options: Standard

SGM-02U3B4L is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Coil Resistance, Bad Condition - Requires Reconditioning, Bad DE Bearing, Bad ODE Bearing
Servomotor Type: SGM
Rated Output: 200W (0.25HP)
Power Supply: 200V UL Recognized
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: UL Recognized
Shaft Specifications: Straight with keyway
Options: Standard

SGM-04UWB4CL is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder, Bad ODE Bearing
Servomotor Type: SGM
Rated Output: 400W (0.5HP)
Power Supply: 200V UL Recognized
Encoder Specifications: 12-bit (1024 P/R) Absolute Encoder
Revision Level: UL Recognized
Shaft Specifications: Straight with keyway
Options: Standard with 24VDC Brake

SGM-A5AW12 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing, Incorrect Feed Back Alignment, Bad Encoder
Servomotor Type: SGM
Rated Output: 50W (0.07HP)
Power Supply: 200V Standard
Encoder Specifications: 12-bit (1024 P/R) Absolute Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Staight without keyway
Options: None

SGM-08AW14D is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Feed Back Connector, Bad Power Connector, Bad DE Bearing, Bad Encoder, Bad ODE Bearing, Broken Magnets on Rotor, Bad Condition - Requires Reconditioning, Worn Brake Needs Reconditioning, Worn ODE Housing
Servomotor Type: SGM
Rated Output: 750W (1.0HP)
Power Supply: 200V Standard
Encoder Specifications: 12-bit (1024 P/R) Absolute Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Straight with keyway
Options: 90VDC Brake and Shaft oil Seal

SGM-08V312 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder Bearings, Bad ODE Bearing, Bad Power Connector, Broken Magnets on Rotor, Bad Condition - Requires Reconditioning, Worn ODE Housing
Servomotor Type: SGM
Rated Output: 750W (1.0HP)
Power Supply: 200V CE European Specification
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Staight without keyway
Options: None

SGM-04UW14 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Power Connector
Servomotor Type: SGM
Rated Output: 400W (0.5HP)
Power Supply: 200V UL Recognized
Encoder Specifications: 12-bit (1024 P/R) Absolute Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Straight with keyway
Options: None

SGM-01A314 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad Encoder, Bad DE Bearing, Bad ODE Bearing, Bad Power Connector, Bad Condition - Requires Reconditioning
Servomotor Type: SGM
Rated Output: 100W (0.13HP)
Power Supply: 200V Standard
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Straight with keyway
Options: None

SGM-04V312 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad ODE Bearing, Bad DE Bearing, Bad Encoder Bearings, Bad Condition - Requires Reconditioning
Servomotor Type: SGM
Rated Output: 400W (0.5HP)
Power Supply: 200V CE European Specification
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: Standard or CE Specification
Shaft Specifications: Staight without keyway
Options: None

SGM-08U3B4CL is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing, Bad Condition - Requires Reconditioning
Servomotor Type: SGM
Rated Output: 750W (1.0HP)
Power Supply: 200V UL Recognized
Encoder Specifications: 2048 P/R Incremental Encoder
Revision Level: UL Recognized
Shaft Specifications: Straight with keyway
Options: Standard with 24VDC Brake