Our Team Expertly Repairs Yaskawa AC Servo Motor Sigma 2 Series

Precision Zone specializes in Yaskawa product repairs servicing a wide range of AC Servo series such as Yaskawa SGMSH 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 SGMSH 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 U
Multimeter Negative Lead V
Resistance Check Approximately 0.13-14.0 Ohm’s
Multimeter Positive Lead U
Multimeter Negative Lead W
Resistance Check Approximately 0.13-14.0 Ohm’s

Multimeter Positive Lead V
Multimeter Negative Lead W
Resistance Check 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 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 2 Series Servopack will display when the SGMSH 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

Yaskawa SGMSH-15ACA6S image SGMSH-15ACA6S is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Worn ODE Housing, Bad DE Bearing, Bad ODE Bearing, Recommend Refurbishing/Reconditioning, Worn DE Housing
Servomotor Type: SGMSH Sigma II
Rated Output: 1.5kW (2.0HP)
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Revision Level: A
Shaft Specifications: Straight with key and tap
Accessories: Shaft oil Seal

Yaskawa SGMSH-30DCA61 image SGMSH-30DCA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing, Recommend Refurbishing/Reconditioning, Worn ODE Housing
Servomotor Type: SGMSH Sigma II
Rated Output: 3.0kW (4.0HP)
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Revision Level: A
Shaft Specifications: Straight with key and tap
Accessories: Standard

Yaskawa SGMSH-15A2A2S image SGMSH-15A2A2S is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing, Recommend Refurbishing/Reconditioning, Worn ODE Housing
Servomotor Type: SGMSH Sigma II
Rated Output: 1.5kW (2.0HP)
Power Supply: 200V
Encoder Specifications: 17-bit Absolute Encoder
Revision Level: A
Shaft Specifications: Straight without key
Accessories: Shaft oil Seal

Yaskawa SGMSH-30D2A61 image SGMSH-30D2A61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder, Bad Encoder Bearings, Bad ODE Bearing, Recommend Refurbishing/Reconditioning, Worn ODE Housing
Servomotor Type: SGMSH Sigma II
Rated Output: 3.0kW (4.0HP)
Power Supply: 400V
Encoder Specifications: 17-bit Absolute Encoder
Revision Level: A
Shaft Specifications: Straight with key and tap
Accessories: Standard

Yaskawa SGMSH-15DCA61 image SGMSH-15DCA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder, Bad ODE Bearing, Recommend Refurbishing/Reconditioning, Worn DE Housing, Worn ODE Housing
Servomotor Type: SGMSH Sigma II
Rated Output: 1.5kW (2.0HP)
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Revision Level: A
Shaft Specifications: Straight with key and tap
Accessories: Standard

Yaskawa SGMSH-15PCA2C image SGMSH-15PCA2C is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing, Recommend Refurbishing/Reconditioning, Worn Brake Needs Reconditioning, Worn ODE Housing
Servomotor Type: SGMSH Sigma II
Rated Output: 1.5kW (2.0HP)
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Revision Level: A
Shaft Specifications: Straight without key
Accessories: with 24VDC Brake

Yaskawa SGMSH-10DCA61 image SGMSH-10DCA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing, Recommend Refurbishing/Reconditioning
Servomotor Type: SGMSH Sigma II
Rated Output: 1.0kW (1.3HP)
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Revision Level: A
Shaft Specifications: Straight with key and tap
Accessories: Standard

Yaskawa SGMSH-50DCA61 image SGMSH-50DCA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder Bearings, Bad ODE Bearing, Recommend Refurbishing/Reconditioning, Worn ODE Housing
Servomotor Type: SGMSH Sigma II
Rated Output: 5.0kW (6.7HP)
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Revision Level: A
Shaft Specifications: Straight with key and tap
Accessories: Standard

Yaskawa SGMSH-20DCA61 image SGMSH-20DCA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad ODE Bearing, Recommend Refurbishing/Reconditioning, Worn ODE Housing
Servomotor Type: SGMSH Sigma II
Rated Output: 2.0kW (2.7HP)
Power Supply: 400V
Encoder Specifications: 17-bit Incremental Encoder
Revision Level: A
Shaft Specifications: Straight with key and tap
Accessories: Standard

Yaskawa SGMSH-15ACA61 image SGMSH-15ACA61 is an
Motors-AC Servo manufactured by Yaskawa
Discovered issues: Bad DE Bearing, Bad Encoder Bearings, Bad ODE Bearing, Recommend Refurbishing/Reconditioning, Worn ODE Housing
Servomotor Type: SGMSH Sigma II
Rated Output: 1.5kW (2.0HP)
Power Supply: 200V
Encoder Specifications: 17-bit Incremental Encoder
Revision Level: A
Shaft Specifications: Straight with key and tap
Accessories: Standard