Resetting the Fault May Not Fix the Problem11/24/2016We at Precision Electronic Services recently repaired a Yaskawa CIMR-F7U42P2 AC Drive. This drive is a 480 volt input unit rated at 5.3 amps and 3 horsepower. The symptom given by the customer when sent was “Intermittent faults. Bus over voltage while running under load comes and goes. Faults are resettable.”Many drives will run with components that are outside of their range of tolerance. This can cause a myriad of nuisance faults and failures that a drive reset may clear. After clearing the fault, the drive may run fine for a time, but will likely begin faulting again and usually more and more frequently. The nature of what will cause such a fault is wide ranging. Heat, cold, vibration, fluctuating voltage or current and many other factors. Drives that have been in daily operation for years are likely candidates for refurbishment. Of course conditions of the drive and components vary based on usage and environment of the operation of the drive.Upon evaluation of this Yaskawa F7 series drive, we found electrolytic capacitors throughout the drive that were functional and looked as they should visually, but were showing signs of deterioration when checked with a component tester. The cooling fan was noisy during operation. There were also several questionable solder connections found. When we check and refurbish a drive some of the things that we look for and do are disassemble and clean the drive, replace aged and out of tolerance components, remove contamination, touch up solder joints, re-seat cables and socked ICs, and tighten hardware connections. This is of course in addition to any repairs that may also be needed.In this specific instance we replaced the out of tolerance capacitors on both the control board and the power board. The noisy fan was also replaced because a bad fan has the potential to draw more current, move less air than is necessary for the drive to keep cool, or stop completely allowing the drive to overheat. Overheating and vibration are typical causes of the bad solder connections that we also touched up as part of this repair.Once the repairs to the drive were completed, we functionally tested the drive to verify that the drive inputs and outputs worked correctly as well as the keypad. After functional testing was completed, the drive was dynamically load tested and burned in on one of our custom engineered motor load centers. All of this rigorous testing is to ensure the drive will perform as it should when it is re-installed at the customer's facility, which this drive did. Once put back into operation, the drive functioned as it should without faulting.Our warranty is two years from the date of the invoice and since we do a complete refurbishment of the control instead of just fixing the minimum, the warranty covers the entire unit. The difference between us and our competitors is experience and service. Our technicians are all veterans of the business and have years of experience working in the repair business. Our service will not be outdone. We are small and flexible enough to be very responsive to your needs and large enough to take care of you. So call us today at 800-732-4695. Back To Blog
Resetting the Fault May Not Fix the Problem11/24/2016We at Precision Electronic Services recently repaired a Yaskawa CIMR-F7U42P2 AC Drive. This drive is a 480 volt input unit rated at 5.3 amps and 3 horsepower. The symptom given by the customer when sent was “Intermittent faults. Bus over voltage while running under load comes and goes. Faults are resettable.”Many drives will run with components that are outside of their range of tolerance. This can cause a myriad of nuisance faults and failures that a drive reset may clear. After clearing the fault, the drive may run fine for a time, but will likely begin faulting again and usually more and more frequently. The nature of what will cause such a fault is wide ranging. Heat, cold, vibration, fluctuating voltage or current and many other factors. Drives that have been in daily operation for years are likely candidates for refurbishment. Of course conditions of the drive and components vary based on usage and environment of the operation of the drive.Upon evaluation of this Yaskawa F7 series drive, we found electrolytic capacitors throughout the drive that were functional and looked as they should visually, but were showing signs of deterioration when checked with a component tester. The cooling fan was noisy during operation. There were also several questionable solder connections found. When we check and refurbish a drive some of the things that we look for and do are disassemble and clean the drive, replace aged and out of tolerance components, remove contamination, touch up solder joints, re-seat cables and socked ICs, and tighten hardware connections. This is of course in addition to any repairs that may also be needed.In this specific instance we replaced the out of tolerance capacitors on both the control board and the power board. The noisy fan was also replaced because a bad fan has the potential to draw more current, move less air than is necessary for the drive to keep cool, or stop completely allowing the drive to overheat. Overheating and vibration are typical causes of the bad solder connections that we also touched up as part of this repair.Once the repairs to the drive were completed, we functionally tested the drive to verify that the drive inputs and outputs worked correctly as well as the keypad. After functional testing was completed, the drive was dynamically load tested and burned in on one of our custom engineered motor load centers. All of this rigorous testing is to ensure the drive will perform as it should when it is re-installed at the customer's facility, which this drive did. Once put back into operation, the drive functioned as it should without faulting.Our warranty is two years from the date of the invoice and since we do a complete refurbishment of the control instead of just fixing the minimum, the warranty covers the entire unit. The difference between us and our competitors is experience and service. Our technicians are all veterans of the business and have years of experience working in the repair business. Our service will not be outdone. We are small and flexible enough to be very responsive to your needs and large enough to take care of you. So call us today at 800-732-4695.