Lenze Drive Repair
Precision Electric offers Lenze drive repair because manufacturers cannot afford downtime when equipment fails. Most Lenze drives are replaceable but Lenze drives that aren’t in stock have extensive lead times. Lenze drive repair is usually less expensive than Lenze drive replacement.Precision Electric offers free Lenze drive repair quotes to customers who have failed Lenze equipment. The following is a list of steps Precision Electric uses for each Lenze drive repair.
Checking connections is a step many people miss or do incorrectly during Lenze drive repair. Heat cycles and mechanical vibration can lead to substandard 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 during Lenze drive repair, and 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 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 – Before powering up the Lenze drive, programs and parametersthat can be salvaged from the drive should be backed up to a separate drive or computer. Then, if the input and output power sections test healthy during the Lenze drive repair, power is applied to the unit to perform amp reading and output frequency tests. Precision Electric prefers to slowly increase power voltage to the drive until the rated input voltage of the drive is achieved. Depending on whether or not the Lenze 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 tests have passed during the Lenze drive repair process, then it is time to run a basic jog function of the drive with a simple template program. After the drive programs and parameters are backed up and saved, we either reset the adjustable speed drive to factory defaults and recommission a basic start, stop and job application or closed loop if an encoder is involved. 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.
Contact Customer – At this point we have determined the cause of failure, estimated lead time and cost of the parts that need replaced for the Lenze drive repair, and are ready to offer the customer our repair quote. If the drive performs perfectly during the entire repair process, then further underlying issues are communicated with the customer. This is when Precision Electric will gather application specific information from the customer to establish whether or not it may be some outside issue associated with the system; such as PLC communications, faulty I/O, bad wiring, bad cabling. There is no single way to do this step since it depends on a wide variety of variables.
Lenze drive repair should be taken with extreme caution. Drive repair should only be performed by technicians who have required training and experience to work with electrical equipment. Precision Electric strongly recommends consulting an expert in the field when repairing all industrial electrical equipment. Many drive controllers have an internal DC bus that retains a charge after power has been cut to the drive, as a result, it does not mean it’s safe to work with. Technicians working variable frequency drives and other electrical equipment must always take extra precautions to ensure proper safety measures are taken, or injury or even death may occur.
ForLenze drive repair quotes, contact Precision Electric.
