Precision Zone specializes in Yaskawa product repairs servicing a wide range of AC Spindle series such as Yaskawa CIMR-VM3C Series Spindle Drives.

Varispeed VS626 VM3C Drives are reliable adjustable speed A/C spindle motor drives. CIMR-VM3C drives combine a compact A/C spindle drive motor with a digital vector controlled, transistor inverter. Alarm information can be viewed and reset and parameters can be viewed and changed with a digital operator located on the front of the drive.

The CIMR-VM3C drives achieve high speed operation and heavy duty machining even while operating under adverse environmental conditions. The CIMR-VM3C is an ideal spindle drive for machining centers, lathes, and milling machines.

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-VM3C 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.

First you must open up the drive and using your digital multimeter check the DC buss and make sure the DC buss has been discharged.

Input Modules Testing

Multimeter Positive Lead	L1 L2 L3
Multimeter Negative Lead	Positive Side of the DC Buss
Diode Check	Approximately 0.36 V for each phase

Multimeter Positive Lead	Negative Side of the DC Buss
Multimeter Negative Lead	L1 L2 L3
Diode Check	Approximately 0.36 V for each phase

Output Modules Testing

Multimeter Positive Lead	U V W
Multimeter Negative Lead	Positive Side of the DC Buss
Diode Check	Approximately 0.33 V for each phase

Multimeter Positive Lead	Negative Side of the DC Buss
Multimeter Negative Lead	U V W
Diode Check	Approximately 0.32 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 dirve are displayed through one seven segment display located on the control board. The codes displayed are:

Alarm Code	Code Type
F100	Overcurrent alarm
F500	Motor Overspeed
F700	Overload
F900 and 901	Motor Thermal
Fd17	Magnetic Sensor Wiring
F400	Overvoltage
F604	Incoming Power Problem
FA00	Initial Start up Failure
CPF00 and CPF01	CPU Faults
FA01	Blown Fuse

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