Precision Zone specializes in Yaskawa product repairs servicing a wide range of AC Spindle series such as Yaskawa CIMR-MT Series Spindle Drives.

Varispeed VS626 MT Drives where Yaskawa’s First AC spindle series to come out and are reliable adjustable speed A/C spindle motor drives. The CIMR-MT drives achieve high speed operation and heavy duty machining even while operating under adverse environmental conditions.

When assessing the functionality of a drive, our engineering team typically conducts a four-step check:

• Visual Overview Check
• Static Test
• Checks Under Power
• Alarm Codes Verification

This overview is Precision Zone’s basic troubleshooting process. Once our repair team starts on the job we use specialized, customized test fixtures, 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. Precision Zone goes as far as using heat chamber and overnight dynamic testing to guarantee performance of the repaired product when it comes back to the customer.

REPAIR PROCESS FOR CIMR-MT SERIES SPINDLE DRIVE

Visual Overview Check

When conducting a visual check, the technician inspects the drive for any mechanical damage to the drive and print circuit boards. Then the team proceeds to verify connections are tight and correct inside the drive and there are no loose screws, wires or particles. Additionally, we look for any burn marks anywhere on the components or chassis. During the visual inspection technical team notes excessive dirt on cooling components and records clogged heatsink.

Static Test Basic

Precision Zone repair technicians use digital multimeter with diode testing capabilities and resistance measurement to conduct a static test. In the instance of Diode testing, our team is looking to check input and output modules.

Input Modules Testing

Multimeter Positive Lead	Negative Capacitor Terminal
Multimeter Negative Lead	R S T
Diode Check	Approximately 0.43 V for each phase

Multimeter Positive Lead	R S T
Multimeter Negative Lead	Positive Capacitor Terminal
Diode Check	Approximately 0.43 V for each phase

Output Modules Testing

Multimeter Positive Lead	Negative Capacitor Terminal
Multimeter Negative Lead	U V W
Diode Check	Approximately 0.33 V for each phase

Multimeter Positive Lead	U V W
Multimeter Negative Lead	Positive Capacitor Terminal
Diode Check	Approximately 0.33 V for each phase

We verify capacitor value using capacitor meter and examine functionality of circuit breakers and contactors in the drive.

Alarm Codes Troubleshooting

The alarms on the spindle drive are displayed through a five red LED’s display located on the control board. Abbreviations are on the control board right next to the led. The codes displayed are :

Alarm Code	Code Type
A. QC	Overcurrent
A.QL	Overload
A. OV	Overvoltage
A. FU	Fuse Off
OS	Overspeed

The majority of these alarms can be triggered if there is a fault in the control circuit.