Fanuc Power Mate i-D/H Maintenance Manual

APPENDIX
B63175EN/03
A. ALARM LIST
499
No. RemedyDescriptionMeaning
Alarm
No.
Message
7n46 SPN_n_ : SCREW
1ROT POS
COD. ALARM
AL46 Alarm for
indicating
failure in
detecting
position coder
1rotation
signal in thread
cutting
operation.
Detects failure in detecting
position coder 1rotation
signasl in thread cutting
operation.
Make 1rotation signal
adjustment for signal
conversion circuit.
Check cable shield status.
7n47 SPN_n_ : POSCODER
SIGNAL AB-
NORMAL
AL47 Position coder
signal
abnormality
Detects incorrect position
coder signal count operation.
Make signal adjustment for
signal conversion circuit.
Check cable shield status.
7n49 SPN_n_ : HIGH CONV.
DIF. SPEED
AL49 The converted
differential
speed is too
high.
Detects that speed of other
spindle converted to speed of
local spindle has exceeded
allowable limit in differential
mode.
Calculate differential
speed by multiplying speed
of other spindle by gear
ratio. Check if calculated
value is not greater than
maximum speed of motor.
7n50 SPN_n_ : SPNDL CON-
TROL OVER-
SPEED
AL50 Excessive
speed
command
calculation
value in
spindle
synchronizatio
n control
Detects that speed command
calculation value exceeded
allowable range in spindle
synchronization control.
Calculate motor speed by
multiplying specified
spindle speed by gear
ratio. Check if calculated
value is not greater than
maximum speed of motor.
7n51 SPN_n_ : LOW VOLT DC
LINK
AL51 Undervoltage
at DC link
section
Detects that DC power supply
voltage of power circuit has
dropped (due to momentary
power failure or loose contact
of magnetic contactor).
Remove cause, then reset
alarm.
7n52 SPN_n_ : ITP SIGNAL
ABNORMAL I
AL52 ITP signal
abnormality I
Detects abnormality in
synchronization signal (ITP
signal ) used in software.
Replace servo amp. PCB.
7n53 SPN_n_ : ITP SIGNAL
ABNORMAL II
AL53 ITP signal
abnormality II
Detects abnormality in
synchronization signal (ITP
signal) used in hardware.
Replace servo amp. PCB.
7n56 SPN_n_ : INNER COOL-
ING FAN STOP
AL56 The cooling fan
in the unit
stopped.
The cooling fan in the control
circuit section stopped.
Check the turning state of
the cooling fan. Replace
the cooling fan.
7n57 SPN_n_ : EX DECEL-
ERATION
POWER
AL57 Deceleration
power is too
high.
Abnormal current flowed
through the regenerative
resistor.
Check the selection of the
regenerative resistor.
Alternatively, check
whether the cooling fan
motor is rotating.

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