Our Team Specializes in Fanuc AC Servo Drive Alpha Series Repairs

At Precision Zone, we specialize in Fanuc product repairs which include a wide range of AC Servo drives. One of the many servo lines we service is the Fanuc Alpha series servo line.

The Fanuc Alpha line consists of many different variations. These variations consist of interface types A, B, A/B, FSSB (optical communication) within either single, two or three axis units. Additionally, these servos have 200V and 400V offerings. Each servo part number begins with A06B and is followed by 8 more identifying characters that distinguish each unit. The last 8 digits indentify which interface type, how many axes, and what model each unit is.

For example, in the A06B-6080-H301 servo drive, the 6080 indentifies this as a ‘type B’ interface servo. The H3 specifies this is a three axis drive, and the final 01 uniquely distinguishes this drive as model SVM3-12/12/12.

When assessing the functionality of a drive, our repair team conducts a four-step evaluation:

    1. Visual Overview
    2. Static Test
    3. Checks Under Power
    4. Alarm Codes Verification

This overview is Precision Zone’s basic troubleshooting process. Once our repair team starts on the job, we use specialized and customized testing fixtures, Huntron trackers, signal generators, oscilloscopes, milli and mega ohm meters, as well as any other necessary tools we have available to assure quality repair work. Most importantly, every repair is fully tested in our custom-built simulators under load with a motor to replicate real-life working environment.

Precision Zone goes as far as using heating chambers and overnight dynamic testing, when applicable, to guarantee performance of the repaired product when it arrives back with the customer.

Repair Process for Fanuc Alpha Series AC Servo Drives

Visual Overview

When conducting a visual check, the technician inspects the drive for any mechanical damage to the drive itself and any printed circuit boards. The technician then proceeds to verify connections are tight and correct inside the drive and there are no loose screws, wires or debris. Additionally, the unit is checked for any burn marks on the components, printed circuit boards or chassis. During the visual inspection, excessive dirt on cooling components is noted as well as the functionality of the heat sink.

Basic Static Check

Output Module Testing

Precision Zone repair technicians use digital multimeters with diode testing capabilities and also take resistance measurements to conduct a static test. For these units in particular, our team of technicians uses the diode function of the multimeter as well as huntron devices to check the output modules.

Positive Lead Negative Lead Reading
U Positive bus terminal 0.34V-0.37V
V Positive bus terminal 0.34V-0.37V
W Positive bus terminal 0.34V-0.37V
Negative bus terminal U 0.34V-0.37V
Negative bus terminal V 0.34V-0.37V
Negative bus terminal W 0.34V-0.37V

The capacitor values on the PCBs are verified and any relays, contactors or circuit breakers in the drive are examined to ensure proper functionality.

Checks Under Power and Alarm Code Verification

Upon successfully passing all visual and static checks, the drive is tested under power. Any reported alarm codes are verified and if no alarms are present or once the drive has been fully repaired, the drive is tested in our Fanuc Alpha series simulator. Alarms can be verified on the LED directly on the servo pack. When the LED displays ‘0’ the servo motor is ready to operate and is being supplied with power.

There is a distinction between alarms with a dot and those without. For example, alarm ‘8.’ differs from alarm ‘8’ due to the period.

List of Alarms

Alarm Code Description Checks
Al 1 Internal Cooling Fan Stopped
  • Check to see if there is any dirt or debris clogging the fan
  • Verify the fan connectors to make sure nothing is damaged or improperly connected
Al 2 Low Voltage, Control Power
  • Check three phases input voltage to power supply module
Al 5 DC Link Undervoltage
  • With the power off and drive discharged, check to make sure DC bus bar screws are tight
  • If multiple drives have this alarm, troubleshoot the power supply unit
  • Check incoming three phases voltage to the power supply unit
  • Verify DC bus voltage is in proper range
Alarms Abnormal Current Alarm
    8
    9
    A
    b
    C
    d
    E
    8 – L axis
    9 – M axis
    A – N axis
    b – L & M axes
    C – M & N axes
    d – L & N axes
    E – L, M, & N axes
  • Disconnect motor lead
  • Meg the motor
  • check resistance phase to phase to motor (U,V,W)
  • Check the amp output legs to ground for any shorts
Alarms IPM Alarm
    8
    9
    A
    b
    C
    d
    E
    L axis
    M axis
    N axis
    L & M axes
    M & N axes
    L & N axes
    L, M, & N axes
  • Disconnect motor leads from servo and release the servo from EMG stop
  • If alarm goes away, check the insulation of the motor leads with a megger
  • If possible, swap drives or axes and see if alarm follows drive

Precision Zone Repair Benefits for Fanuc AC Servo Alpha Series

    1. FREE evaluation by expert technician includes:
    • Visual Inspection
    • Static Check
    • Power Tests
    2. FREE job estimate
    3. 12 month warranty on our parts and labor
    4. Flat Price
    5. Exchange Option
    6. Rush Service


Recently Repaired Products

Fanuc A06B-6096-H106 image A06B-6096-H106 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s), Bad Cooling Fans
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 1 axis, Alpha 130
Options: none

Fanuc A06B-6096-H302 image A06B-6096-H302 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 3 axis, Alpha 12/12/20
Options: none

Fanuc A06B-6079-H303 image A06B-6079-H303 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Output Transistors/SCRs, Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, Type A/B interface (For 3 Axis = Type A interface only)
Number of Axes & Description: 3 axis, Alpha 12/20/20

Fanuc A06B-6079-H104 image A06B-6079-H104 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Capacitor(s), Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, Type A/B interface (For 3 Axis = Type A interface only)
Number of Axes & Description: 1 axis, Alpha 40L

Fanuc A06B-6096-H105 image A06B-6096-H105 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Gate Section/Board, Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 1 axis, Alpha 80
Options: none

Fanuc A06B-6096-H209 image A06B-6096-H209 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Capacitor(s), Bad Output Transistors/SCRs, Bad Cooling Fans
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 2 axis, Alpha 40L/40L
Options: none

Fanuc A06B-6096-H102 image A06B-6096-H102 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Output Transistors/SCRs
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 1 axis, Alpha 20
Options: none

Fanuc A06B-6079-H105 image A06B-6079-H105 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, Type A/B interface (For 3 Axis = Type A interface only)
Number of Axes & Description: 1 axis, Alpha 80

Fanuc A06B-6079-H207 image A06B-6079-H207 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, Type A/B interface (For 3 Axis = Type A interface only)
Number of Axes & Description: 2 axis, Alpha 40/80

Fanuc A06B-6079-H106 image A06B-6079-H106 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, Type A/B interface (For 3 Axis = Type A interface only)
Number of Axes & Description: 1 axis, Alpha 130

Fanuc A06B-6096-H207 image A06B-6096-H207 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Circuit Board Component(s)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 2 axis, Alpha 40/80
Options: none

Fanuc A06B-6079-H202 image A06B-6079-H202 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: No Display
Part Group: A06B
Model & Interface Type: Alpha Servo Module, Type A/B interface (For 3 Axis = Type A interface only)
Number of Axes & Description: 2 axis, Alpha 12/20

Fanuc A06B-6096-H116 image A06B-6096-H116 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 1 axis
Options: none

Fanuc A06B-6079-H208 image A06B-6079-H208 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, Type A/B interface (For 3 Axis = Type A interface only)
Number of Axes & Description: 2 axis, Alpha 80/80

Fanuc A06B-6096-H208 image A06B-6096-H208 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Output Transistors/SCRs, Bad Circuit Board Component(s)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 2 axis, Alpha 80/80
Options: none

Fanuc A06B-6079-H206 image A06B-6079-H206 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Capacitor(s), Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, Type A/B interface (For 3 Axis = Type A interface only)
Number of Axes & Description: 2 axis, Alpha 40/40

Fanuc A06B-6096-H218-H image A06B-6096-H218-H is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Capacitor(s), Bad Circuit Board Component(s)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 2 axis, 80S/80S
Options: H

Fanuc A06B-6096-H205 image A06B-6096-H205 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 2 axis, Alpha 20/40
Options: none

Fanuc A06B-6080-H307 image A06B-6080-H307 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, Type B interface (For 3 Axis)
Number of Axes & Description: 3 axis, Alpha 20/20/40

Fanuc A06B-6096-H206 image A06B-6096-H206 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 2 axis, Alpha 40/40
Options: none

Fanuc A06B-6079-H103 image A06B-6079-H103 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Leaky Capacitors (Open, Corroded Traces), Bad Cooling Fans
Part Group: A06B
Model & Interface Type: Alpha Servo Module, Type A/B interface (For 3 Axis = Type A interface only)
Number of Axes & Description: 1 axis, Alpha 40S

Fanuc A06B-6096-H204 image A06B-6096-H204 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 2 axis, Alpha 12/40
Options: none

Fanuc A06B-6096-H104 image A06B-6096-H104 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 1 axis, Alpha 40L
Options: none

Fanuc A06B-6096-H201 image A06B-6096-H201 is an
Drives-AC Servo manufactured by Fanuc
Discovered issues: Bad Output Transistors/SCRs, Leaky Capacitors (Open, Corroded Traces)
Part Group: A06B
Model & Interface Type: Alpha Servo Module, FSSB interface
Number of Axes & Description: 2 axis, Alpha 12/12
Options: none