FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

APPENDIX
B–62764EN/01
G. ALARM LIST
903
Alarm
No.
RemedyDescriptionMeaning
AL–46 Alarm for indicating failure in
detecting position coder
1–rotation signal in thread
cutting operation.
Detects failure in detecting position coder 1–rota-
tion signasl in thread cutting operation.
Make 1–rotation signal ad-
justment for signal conver-
sion circuit
Check cable shield status.
AL–47 Position coder signal ab-
normality
Detects incorrect position coder signal count op-
eration.
Make signal adjustment
for signal conversion cir-
cuit.
Check cable shield status.
AL–48 Position coder 1–rotation sig-
nal abnormailty
Detects that occurrence of position coder 1–rota-
tion signal has stopped.
Make 1–rotation signal ad-
justment for signal conver-
sion circuit.
AL–49 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.
Check the position coder
state of the other side.
AL–50 Excessive speed command
calculation value in spindle
synchronization control
Detects that speed command calculation value
exceeded allowable range in spindle synchroniza-
tion control.
Check parameters such
as a position gain.
AL–51 Undervoltage at DC link sec-
tion
Detects that DC power supply voltage of power
ciucuit has dropped (due to momentary power fail-
ure or loose contact of magnetic contactor).
Remove cause, then reset
alarm.
AL–52 ITP signal abnormality I Detects abnormality in synchronization signal (ITP
signal )with CNC (such as loss of ITP signal).
Remove cause, then reset
alarm.
AL–53 ITP signal abnormality II Detects abnormality in synchronization signal (ITP
signal) with CNC (such as loss of ITP signal).
Remove cause, then reset
alarm.
AL–54 Overload current alarm Detects that excessive current flowed in motor for
long time.
Check if overload opera-
tion or frequent accelera-
tion/deceleration is per-
formed.
AL–55 Power line abnormality in
spindle switching/output
switching
Detects that switch request signal does not match
power line status check signal.
Check operation of mag-
netic contractor for power
line switching.
Check if power line status
check signal is processed
normally.

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