Fanuc Power Mate i-D/H Operation Maintenance Handbook

9. ERROR CODE LIST
337
No. RemedyDescriptionMeaning
Alarm
No.
Message
7n44 SPN_n_ :
CONTROL
CIRCUIT
(AD)
ERROR
AL–44 Control circuit
abnormal
(A/D convert-
er)
Abnormality
has occurred in
the A/D con-
verter.
Replace the
A/D converter
printed–
circuit board.
7n46 SPN_n_ :
SCREW
1–ROT
POS–COD.
ALARM
AL–46 Alarm for indi-
cating failure
in detecting
position coder
1–rotation sig-
nal in thread
cutting opera-
tion.
Detects failure
in detecting
position coder
1–rotation sig-
nasl in thread
cutting opera-
tion.
Make 1–rota-
tion signal
adjustment
for signal
conversion
circuit.
Check cable
shield status.
7n47 SPN_n_ :
POS–COD-
ER
SIGNAL
ABNOR-
MAL
AL–47 Position cod-
er signal ab-
normality
Detects incor-
rect position
coder signal
count opera-
tion.
Make signal
adjustment
for signal
conversion
circuit.
Check cable
shield status.
7n49 SPN_n_ :
HIGH
CONV. DIF.
SPEED
AL–49 The con-
verted differ-
ential speed
is too high.
Detects that
speed of other
spindle con-
verted to speed
of local spindle
has exceeded
allowable limit
in differential
mode.
Calculate dif-
ferential
speed by
multiplying
speed of oth-
er spindle by
gear ratio.
Check if cal-
culated value
is not greater
than maxi-
mum speed
of motor.
7n50 SPN_n_ :
SPNDL
CONTROL
OVER-
SPEED
AL–50 Excessive
speed com-
mand calcula-
tion value in
spindle syn-
chronization
control
Detects that
speed com-
mand calcula-
tion value ex-
ceeded allow-
able range in
spindle syn-
chronization
control.
Calculate mo-
tor speed by
multiplying
specified
spindle
speed by
gear ratio.
Check if cal-
culated value
is not greater
than maxi-
mum speed
of motor.
7n51 SPN_n_ :
LOW VOLT
DC LINK
AL–51 Undervoltage
at DC link
section
Detects that
DC power sup-
ply voltage of
power circuit
has dropped
(due to mo-
mentary power
failure or loose
contact of mag-
netic contac-
tor).
Remove
cause, then
reset alarm.
7n52 SPN_n_ :
ITP
SIGNAL
ABNOR-
MAL I
AL–52 ITP signal ab-
normality I
Detects ab-
normality in
synchroniza-
tion signal (ITP
signal ) used in
software.
Replace ser-
vo amp. PCB.

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