Yaskawa Servo Drive Repair, Overview Of Our Process
Yaskawa servo drive repair is usually less expensive than Yaskawa servo drive replacement. Precision Electric offers free Yaskawa servo drive repair quotes to customers with failed equipment. The following is an overview of the Precision Electric Yaskawa servo drive repair process.
Checking connections is a step many people miss or do incorrectly during a Yaskawa servo drive repair. Heat cycles and mechanical vibration can lead to sub-standard connections, as can standard preventative maintenance practices. Reusing torque screws is not a good Idea, and further tightening an already tight connection, can ruin the connection. Bad connections eventually lead to arcing. Arcing at the drive input terminal can result in nuisance over voltage faults, clearing of input fuses, or damage to protective components. Arcing at the drive output terminal could result in over-current faults or even damage to the power components.Loose connections can cause erratic operation. For example, a loose START/STOP signal wire can cause uncontrollable drive starting and stopping. A loose speed reference wire can cause the drive speed to fluctuate, resulting in scrap, machine damage, or personnel injury.
Conduct Diode and IGBT Tests
There are a number of methods to test the input and output power sections of a Yaskawa servo drive. This step is essential prior to applying power to the drive unit. If for any reason there is a short on the input side or output side of the drive, further damage can be caused to the unit if power is applied to it.For this reason, Precision Electric uses meters to properly test the input and output power sections of the adjustable speed drive prior to applying power to the actual unit. If a short is found, the unit can be disassembled and the cause of the short can be diagnosed and quoted for repair. If the repair is too costly, then a replacement is offered to the customer.
Power Up Unit
If the input and output power sections test healthy during this step of the Yaskawa servo drive repair, Precision Electric will power the unit and perform amp reading and output frequency tests. Precision Electric prefers to slowly increase power voltage to the unit until the rated input voltage of the drive is achieved. Depending on whether or not the servo drive provides a display, will determine what further action(s) will be taken. If display is unavailable, disassembly and diagnosis of the internal power supply of the control section of the drive is likely necessary to further evaluate cause of failure and establish cost and lead time for the repair.
Run A Motor
If the previous three tests have passed during the Yaskawa servo drive repair process, then it is time to run a basic jog function of the drive with a simple template program. Often when an adjustable speed drive comes into our facility, we make sure to backup all existing programs stored in the drive prior to inputting a template program and running a test procedure. This ensures that we have a backup copy of the program.The best method for backing up depends on the brand of drive. After the program has been backed up, we reset the drive to factory defaults through the keypad and re-commission a basic start, stop and jog function. If the Yaskawa servo drive is closed loop with an encoder, specific alignment and other tests are required. If the motor will not run, it will be necessary to check the output voltages and current ratings going to the motor to see if the drive is functioning properly to rotate the motor.
At this point, a trained technician has determined the cause of failure, estimated the lead time, and approximate cost of the Yaskawa servo drive repair. The cost to repair or replace non-functioning parts is determined and labor time is evaluated by a trained technician. Precision Electric is ready to offer the customer a repair quote. If the drive tested good entirely, further underlying issues are communicated with the customer and an onsite service call is setup, if requested. Onsite service calls are when a trained technician from Precision Electric is sent to the factory or job site to gather application specific information, to establish whether or not it may be some outside issue associated with the system. This varies from servo motor problems, PLC communication issues, faulty I/O, bad wiring, bad cabling, to some other technical problem. There is no single way to do this, since it depends on a wide variety of variables.
Yaskawa servo drive repair should be performed with extreme caution. Precision Electric strongly recommends consulting an expert in the field when repairing any industrial electrical equipment. Many drive controllers have an internal DC bus that retains a charge after power has been cut to the drive, and as a result, it still may not be safe to work with. This is just one example why only experienced technicians should perform these tasks. Technicians performing servo drive repair must always take extra precautions to ensure proper safety measures are taken to prevent injury or death.
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