Here is a quick guide overview to start your Fanuc Alpha servo amplifier after it has been replaced, removed, or repaired in your machine. This is an excerpt from the official Fanuc maintenance manual. For all Alpha Series Control Motor Amplifiers (servo amplifier units A06B-6089-H*** and A06B-6090-H***).
(NOTE: When maintaining or inspecting the servo amplifiers, keep the power supply switched off. Also, make sure that the “CHARGING” LED (red) beside the circuit breaker on the front panel of the servo amplifier is off as well.)
Confirm the CNC model, and the specifications of the control motors, detectors, and servo amplifier units.
Check for damage to the appearance.
Connecting the Power Supply – Confirm the line voltage and power requirements
Line voltage
Before connecting the power source to the machine, check the voltage
of the power source.
Connect grounding line, power cords, and motor power wires.
Connecting grounding lines, power cords, and motor power wires before start-up.
Connecting to the Protection Ground – When it is necessary to make a motor operating with the SVU qualify for European CE marking, ground the motor using the accessory plate terminal. Note that installing more than one protection ground line with single screw makes it impossible for the motor to qualify for European CE marking.
Leakage Current and Selecting a Ground Fault Interrupter – Because the drive circuit for the servo amplifier unit operates by pulse width modulation control system using IGBT’s, high-frequency leakage current flows from the motor windings and power lines to the ground through stray capacitance. This leakage current may cause the ground fault interrupter or leakage protection relay installed in the power line on the power supply side to malfunction. So they must have a measure against influence from inverters, so that they do not malfunction. To determine the leakage current from each motor, see the table on page 11 from original Fanuc document.
Check the Settings
There are four channel switches above the 7-segment LED behind the terminal board cover on the front of the servo amplifier. These switches should be set as described below before use of the servo amplifier
(1) Positions
The switches are sequentially numbered 1, 2, 3 and 4 with the one at the bottom as switch 1. The OFF position is on the left, and the ON position on the right.
Fanuc switch position on servo amplifier
Switch 1 Setting
The setting of switch 1 varies with the interface type used between the NC and servo amplifier.
→ If the setting is incorrect, an alarm occurs.
→ If the load is light, the motor may keep running.
OFFType A Interface
ON Type B Interface
* The following NC unit has the type A interface: FS-0C, FS-15A, FS-15B, FS-16A, FS-16B, FS-18A, FS-21TA, PM-D, PM-F
* The following NC has the type B interface: FS-20, FS-21TB , FS-21GA, FS-16B, PM-H
Switch 2 setting
For the SVU, set switch 2 to off.
For the SVUC, set switch 2 to on.
→ If the setting is incorrect, the VRDY OFF alarm may occur.
Switch 3 and 4 setting
The setting varies depending on the regenerative discharge resistance used.
→ If the setting is incorrect, the regenerative discharge control circuit failure alarm (DCSW) cannot be detected correctly.
Settings for correctly detecting the regenerative discharge control.
*Footnote – For further information on the start-up procedure, please see Section 3 in the OEM manual titled, ‘Alpha Series Control Motor Amplifier Servo Amplifier Unit’ where this excerpt is borrowed from.
If you have a Fanuc Alpha amplifier that is throwing an error code or has just stopper running, first check the servo motor that it is connected to it, then check the cable. If you find that your amplifier is at fault, send your unit to an experienced repair center Yunus Computer Turkey HongKong China
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