Precision Zone specializes in Yaskawa product repairs servicing a wide range of AC Servo series such as Yaskawa CACR-IR_SC-SD Series Servopack

The CACR-IR_SC-SD Series was designed for CNC applications and the CACR-IR_SD Series was designed for robotics. Both of series can be configured for single, double or three axis.

Yaskawa AC Servo Drive CACR-IR_SC-SD has been developed as basic mechatronics drives for the most advanced Factory Automation and Factory Machining Systems, including robots and machine tools.

For your mechatronics systems, the flexible CACR-IR_SC-SD Series Servopack achieves stable control operation with high accuracy, quick response control under any environmental condition, and smooth, powerful operation even at low-speed range.

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 CACR-IR_SC-SD SERIES SERVOPACKS

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	Multimeter Negative Lead	Diode Check
R S T	Positive Side of DC buss	Approximately 0.3-0.4 V
Negative Side of DC buss	R S T	0.3-0.4 Volts Displayed

Output Modules Testing

Multimeter Positive Lead	Multimeter Negative Lead	Diode Check
U V W	Positive Side of DC buss	Approximately 0.3-0.4 V
Negative Side of DC buss	U V W	Approximately 0.3-0.4 V

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

The last step in a static test process is checking the Regen Resistor. The technicians measure the resistance between Y3 and Y4. Resistance output results will vary depending on the size of the drive, but should not be shorted.

Alarm Codes Troubleshooting

There is no seven segment display on this drive. All alarms are displayed through the control. All of the alarms that are seen through the control are the same as the Yaskawa CACR-IR_SC-SD Series drives.

There are regular alarms and hardware Alarms. In all cases the servo ready LED will turn off. For Hardware alarms, on both types of drive it will flash an H, followed by a period, then finally the alarm number. The alarms are displayed through a seven segment display on the inside side of the drive. The codes displayed are:

Alarm Code	Code Type	Cause
H.1	Hardware or Corrupted Data Alarm	CPU ROM
H.2	Hardware or Corrupted Data Alarm	CPU RAM
H.3	Hardware or Corrupted Data Alarm	Serial Communication
H.5, 6, 7	Hardware or Corrupted Data Alarm	Abnormal Gate Alley
H.8	Hardware or Corrupted Data Alarm	EEPROM Error
H.9	Hardware or Corrupted Data Alarm	Abnormal 4-bit micro computer
H.A, C, E	Hardware or Corrupted Data Alarm	Current feedback problem U phase
H.B, D, F	Hardware or Corrupted Data Alarm	Current feedback problem V phase
A.3	Braking Circuitry Alarms	Regen circuit failure
A.4	Overvoltage Alarm	Regen circuit failure
A.4	Power Alarm	Overvoltage
A.6	Power Alarm	Undervoltage
A.8	Power Alarm	Ground Fault
A.F	Power Alarm	Open Phase
A.1	Overcurrent Alarm	Low insulation to ground
A.2	MCCB Trip Alarm	A short in the drive

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