ALARM LIST FOR SPINDLE AMPLIFIER

AL-01    Motor is Overheated (Thermostat).

AL-02    Speed Deviation is excessive. Actual speed versus Commanded speed.
AL-03    Fuse F7 at DC Link is blown.
AL-04    Fuse F1, F2, or F3 at AC input is blown.
AL-06    Motor has exceeded the Maximum Rated Speed. (Analog System Detection)
AL-07    Motor has exceeded the Maximum Rated Speed. (Digital System Detection)
AL-08    Power Supply voltage is too high.
AL-09    The Heat Sink is overheated.
AL-10    The +15 VDC is abnormally low.
AL-11    The voltage at the DC Link is abnormally high.
AL-12    The current at the DC Link is abnormally high.
AL-13    Arithmetic and Peripheral circuit parts are in an abnormal condition.
AL-14    The ROM is in an abnormal condition.
AL-16    Arithmetic and Peripheral circuit parts are in an abnormal condition.
 to
AL-23

Some of the above alarms also apply to the Power Supply Module. You can tell by the description which ones may or may not.

If a machine issues the 751 alarm when spindle orient is commanded while the spindle is running but not when commanded from a standstill, check the ATC macro to be sure M5 has not been removed. If the spindle is running at an RPM which is significantly higher than the spindle orientation speed it may not be able to make the transition from running to orientation in time to prevent the alarm.

Alarm 751 SERIAL SPINDLE ERROR AL-27 can be caused by a parameter being set wrong but before chasing this make sure that the spindle encoder is connected on the motor end as well as the amplifier side. Also, if the machine uses a separate position pulse coder, make sure it is connected on both ends.

408
SPINDLE SERIAL LINK START FAULT
This alarm is generated when the spindle control unit is not ready for starting correctly when the power is turned on in the system with the serial spindle. The possible causes are:

1. Parameter set incorrectly.
2. An improperly connected optic cable or the spindle control unit’s power is   off.
3. When the NC power was turned on under alarm conditions other than SU-01 or   AL-24 which are shown on
    the LED display of the spindle control unit. In   this case, turn the spindle amplifier power off and perform
    power up again.
4. Improper combination of hardware.
    This alarm does not occur after the system including the spindle control unit is activated.

409
SPINDLE ALARM DETECTION
A spindle amplifier alarm occurred in a system with a serial spindle. The alarm is indicated as “AL-XX” (where XX is a number) on the display of the spindle amplifier. Setting parameter 397.7 causes the spindle amplifier alarm number to appear on the CRT/LCD.

If an excessive spindle alarm occurs during rigid tapping, the relevant alarm for the tapping feed axis is displayed.

704
SPINDLE OVERHEAT
Spindle overheat was detected by the spindle speed fluctuation detection function (T series).


945
SERIAL SPINDLE COMMUNICATION ERROR
The hardware configuration is incorrect for the serial spindle or a communication alarm occurred. Check the hardware configuration of the spindle. Also, check that the hardware for the serial spindle is connected securely.

945
SERIAL SPINDLE COMMUNICATION ERROR
The hardware configuration is incorrect for the serial spindle or a communication alarm occurred. Check the hardware configuration of the spindle. Also, check that the hardware for the serial spindle is connected securely.

946
SECOND SERIAL SPINDLE COMMUNICATION ERROR
Communication is impossible with the second serial spindle. Check that the second serial spindle is connected securely.

If you have an alarm on an Alpha spindle amplifier, the problem may actually be the power Supply Module even though there is no alarm displayed on the PSM. This is especially true in the case of alarm 03 (AL-03) on the spindle amp. This alarm can be issued if the PSM is not outputting the DC Link voltage but also is not issuing an alarm.

Alarm 751 FIRST SPINDLE ALARM DETECTION, On a machine that uses the high resolution encoder (normally on a lathe with live tooling) check the spindle amplifier. If the alarm code on the amplifier is AL-39, this indicates the failure to detect the one rotation signal for the Cs contouring control. This alarm typically occurs when the C axis is commanded to a specific position. Most of the time this means that the two sensors of the high resolution encoder are not properly aligned, Fanuc has to make the necessary adjustment. It can also be caused by a problem, of course, with the encoders, the drum which is attached to the spindle or the cables, particularly the cable shielding. You also must consider the spindle amplifier itself. In one case the problem was found to be that the belts for the spindle motor had been made too tight causing just enough deflection between the encoders and the drum to generate the alarm every time a C axis position was commanded. In addition, the alarm would occur if the C axis was run even in manual mode above a given speed. This problem was solved by loosening the belts a little.

For Alarm 751 with AL-46, everything is the same but this alarm means that the fault was detected while in “thread cutting” operation.

In either case the problem may be with how eccentric the drum is relative to the sensors. According to Fanuc the run out of the drum must be within five microns (.0002″). Also the drum must be square with the face of the sensor to within 20 microns. The face of the sensor should be centered with the magnetic strip of the drum.


If you have alarm AL-07 on the Power Supply (PSM) and AL-11 on the Spindle Amplifier, there could be a problem with the regenerative circuit of the Spindle Amp. This situation is normally evident when the spindle is ramping down, in particular, from a high RPM. This is because when the spindle decelerates from a high rate of speed, there is a lot of CEMF to dissipate. If there is a problem with the amplifier which prevents it from being dissipated it can cause an DC Link over voltage condition on the spindle amplifier (alarm 11). When the Power Supply sees this high voltage at it’s DC output it looks like a blown fuse of the DC Link (alarm 07).

On the Alpha series Spindle Amplifier, the cooling fan has a detection circuit. If the fan stops, the control will generate Alarm 409.

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