Fanuc Beta Servo A06B-6093-H152 Amplifier server Driver module A06B-6093-H151

Program or Setting Alarms (PS alarms)
No LED Display Description Countermeasure
000 A parameter that requires power-down has
been specified Turn the power off, then back on.
011 The specified feedrate is zero Check the feedrate parameter specified with a function
code
013 The specified feedrate (maximum feedrate) is
zero
Check the value of parameter No. 043, which indicates the
maximum feedrate that can be specified.
070 More than 32 blocks have been registered for
a buffering operation. Reduce the number of registered blocks to 32.
085
Input from the reader/puncher interface or the
like caused an overrun, parity, or framing
error)
Correct the baud of the input/output unit (always 4800) or
other settings.
086
Input from the reader/puncher interface or the
like includes an input/output unit operation
ready signal (DR) that is set to off.
Turn the reader/puncher on. Check the cable connection.
087
After input from reader/puncher interface or
the like stops, character input does not stop
even though ten characters have been input.
Check the cable connection.
090 Reference position setting cannot be executed
normally.
Move the tool in the direction of reference position return in
jog mode at a speed that causes the servo position error to
exceed 128. Then, specify another reference position
093
A first to third reference position return cannot
be executed because the reference position
has not yet been established.
Set the reference position.
224
The reference position has not yet been
established. This occurs only when the ZRTN
bit of parameter No.001 is set to 0.
Set the reference position.
250 Input data 1 is invalid. Check input data 1, specified with a function code.
251 Input data 2 is invalid. Check input data 2, specified with a function code.
255
Operation can not be activated because an
invalid mode is specified or because block
execution is in progress.
Check the mode. Check whether a block is being
executed.
290 The interface switch signal (DRC) was
switched during block execution. Switch the signal after block execution stops.
291
The speed of an axial movement specified by
an external pulse has exceeded the upper
limit. This occurs only when the EPEXA bit of
parameter No.001 is set to 1.
Check the speed specified by the external pulse. Check
the magnification of the external pulse (parameters No.062
and 063).
292 A checksum error for the battery-powered
memory was detected
Parameters are cleared. Set the parameters again. If this
alarm subsequently recurs, replace the unit.
Pulse coder alarms
No. LED display Description Countermeasure
300 A communication error (DTER) for the serial
pulse coder was detected.
Check the continuity of the signal cable. If the cable is
normal, the pulse coder may be defective. Turn the power
off. If the alarm recurs, replace the serial pulse coder and
motor.
301 A communication error(CRCER) for serial
pulse coder was detected.
Check the continuity of the signal cable. If the pulse coder
is normal, the pulse coder or servo unit may be defective.
This error can also be caused by external noise.
302 A communication error (STBER) for serial
pulse coder was detected.
Check the continuity of the signal cable. If the cable is
normal, the pulse coder or servo unit may be defective.
This error can also be caused by external noise.
303 An LED disconnection (LDAL) was detected in
the serial pulse coder.
Turn the power off. If this alarm recurs when the power is
reapplied, replace the motor.
304 A mispulse alarm (PMAL) for the serial pulse
coder was detected.
Turn the power off. If this alarm recurs when the power is
reapplied, replace the motor.
305 A miscount alarm (CMAL) for the serial pulse
coder was detected
Turn the power off. If this alarm recurs when the power is
reapplied, replace the motor.
306 The motor was overheated (OHAL).
This alarm is issued when the amplifier has overheated,
causing the thermostat to trip. Possible causes include an
excessively high ambient temperature and strict operating
conditions. Turn the power off for about ten minutes. If the
alarm recurs, replace the amplifier.
308 A soft phase alarm (SPHAL) was detected. Turn the power off. This alarm may be caused by noise.
319
When the absolute pulse coder is used, the
motor has not yet rotated through more than
one turn after the first power up.
Turn the motor through more than one turn in jog feed
mode, then turn the power off then back on.
350 The battery voltage of the absolute pulse
coder is low.
Replace the battery. Restart the operation from reference
position return.
351 The battery voltage of the absolute pulse
coder is low. (Warning) Replace the battery.
Servo alarms
No. LED Display Description Countermeasure
400 The servo motor has overheated (estimated
value)
Turn the power off. After a while, turn the power back on.
Possible causes include an excessively high
acceleration/deceleration frequency.
401 Servo amplifier ready signal (DRDY) went off.
403 The cooling fins have overheated (hardware
detection)
The load on the motor may be too high. Re-examine the
load conditions.
404 The regenerative discharge unit has
overheated.
This alarm is issued when the average regenerative
discharge energy is too high (when the
acceleration/deceleration frequency is too high, for
example). When the regenerative discharge resistor is
not being used, check whether a dummy connector is
fitted to the CX11-6 connector. When the regenerative
discharge resistor is being used, (1) The average
regenerative discharge energy may be too high. Decrease
the acceleration/deceleration frequency. (2) The
thermostat line of the separate regenerative discharge unit
may not be connected properly. Check the connection.
(3) The thermostat of the separate regenerative discharge
unit may be defective. Disconnect the separate
regenerative discharge unit, then check the thermostat. If
the thermostat is open even though the separate
regenerative discharge unit is cool, replace the separate
regenerative discharge unit. If (1) to (3) are not the cause
of alarm, replace the servo amplifier.
405 Reference position return could not be
executed correctly. Re-execute reference position return.
410
The servo position error in the stop state is
larger than the value specified in parameter
No.110.
Determine the mechanical cause of the large position
error. If no mechanical cause is found, specify a larger
value for the parameter.
411
The servo position error during the movement
is larger than the value specified in parameter
No.182.
Determine the mechanical cause of the large position
error. If no mechanical cause is found, apply any of the
following countermeasures. (1) Specify a larger value for
No. LED Display Description Countermeasure
412 An overcurrent alarm is issued.
This alarm is issued when an excessively large current
flows in the main circuit. (1) Check whether a valid motor
number is specified in parameter No.30. (2) Check
whether the standard values are specified in the current
control parameters for servo control. Correct current
control is possible only when the standard values are
specified for the following parameters: 70, 71, 72, 78, 79,
84, 85, 86, 87, 88, 89, 90. (3) Disconnect the motor power
line from the amplifier connector. Then, release the
emergency stop state. -If the overcurrent alarm
continues, replace the amplifier. -If no overcurrent alarm is
issued, (4) Disconnect the motor power line from the
amplifier and check the insulation between the ground and
each of U, V, and W. (5) Connect the power line. Observe
the waveform of the motor current (IR, IS) while the motor
is accelerating or decelerating. (6) If (1) to (4) above are
not the cause of the alarm, the pulse coder, command
cable, or internal hardware of the CNC may be defective.
413 A DC link over voltage alarm is issued.
This alarm is issued when DC link voltage of the main
circuit is too high. (1) The supply voltage for dynamic
power may exceed the rated value. Check the voltage. (2)
The regenerative discharge unit may not be properly
connected. Check the connections. (3) The resistance of
the separate regenerative discharge unit may be
abnormal. Disconnect the separate regenerative discharge
unit, then check the resistance. If (1) to (3) are not the
cause of the alarm, replace the servo amplifier.
414 A DC link low voltage alarm is issued.
This alarm is issued when DC link voltage of the main
circuit is too low. (1) The external circuit braker may be
turned off. Check the circuit braker. (2) The supply
voltage for dynamic power is lower than the rated value.
Check the voltage. (3) The external magnetic contactor
may not be properly connected. Check the connections. If
(1) to (3) are not the cause of the alarm, replace the servo
amplifier.
417 A parameter has been specified incorrectly.
Check the following parameters: No.30: Is the specified
motor type correct? No.31: is the specified direction of
rotation of the motor correct? No.106: Is the denominator
of the number of pulses per single revolution of the motor
0? No.180: is the specified reference counter capacity 0
or negative value?
418 A DO alarm is issued. Replace the servo unit.
423 The specified speed exceeds 32767000
detection units per second. Re-examine the CMR and speed settings.
425 The cooling fan has stopped.
(1) Check that fan is not clogged with foreign matter. (2)
Check that the power connector of the fan is connected
properly. (3) Replace the fan or servo unit.
Overtravel alarms
No. LED Display Description Countermeasure
500 The positive stroke limit has been exceeded. Check whether *+OT and *-OT are connected correctly.
Check whether a correct move command is specified.
501 The negative stroke limit has been exceeded.
Move the tool in the opposite direction in jog mode, then
perform a reset.
No. LED Display Description Countermeasure
510 The positive soft stroke limit has been
exceeded.
Check whether appropriate values have been specified for
parameters No.142 and 143.Check whether a valid move
command
511 The negative soft stroke limit has been
exceeded.
is specified. Move the tool in the opposite direction in jog
mode, then perform a reset.
System alarms
No. LED Display Description Countermeasure
_ An error was detected in the RAM write/read
test at power-up. Replace the unit.
_ An error was detected in the data collation
check for the battery-powered memory.
Turn the power off then back on. Than, re-enter the
parameters. If this alarm recurs, replace the unit.
_ A data transfer alarm for the battery-powered
memory has been issued. Replace the unit.
_ A watchdog alarm was issued. Turn the power off then back on. If this alarm recurs,
replace the unit.
_ A checksum alarm for the control software
ROM is issued. Replace the unit.
_ A checksum alarm for the ROM that is built
into the CPU is issued. Replace the unit.
_ An error was detected in the control circuit. Replace the unit.
I/O link alarm
No. LED Display Description Countermeasure
_ A FANUC I/O link error occurred. A unit
connected to the line was turned off.
Turn off the power to all units connected to the line. Then,
turn on the slave devices, followed by the master device.
No LED Display
No. LED Display Description Countermeasure
_ The control circuit is not operating normally.
(1) Check the +24VDC control supply voltage. If the
voltage is low, increase the voltage to an appropriate level.
(2) Check whether a fuse in the servo unit has blown. If a
blown fuse is found, replace it. If (1) and (2) are not the
cause, replace the servo amplifier.