Fanuc Power Mate i-D/H Operator Manual

B–63174EN/03
G. ALARM LIST
APPENDIX
615
No. RemedyDescriptionMeaning
Alarm
No.
Message
7n47 SPN_n_ : POS–CODER
SIGNAL
ABNORMAL
AL–47 Position coder
signal ab-
normality
Detects incorrect position
coder signal count operation.
Make signal adjustment
for signal conversion cir-
cuit.
Check cable shield status.
7n49 SPN_n_ : HIGH CONV.
DIF. SPEED
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.
Calculate differential
speed by multiplying
speed of other spindle by
gear ratio. Check if calcu-
lated value is not greater
than maximum speed of
motor.
7n50 SPN_n_ : SPNDL
CONTROL
OVERSPEED
AL–50 Excessive
speed com-
mand calcula-
tion value in
spindle syn-
chronization
control
Detects that speed command
calculation value exceeded
allowable range in spindle
synchronization control.
Calculate motor speed by
multiplying specified
spindle speed by gear ra-
tio. Check if calculated
value is not greater than
maximum speed of motor.
7n51 SPN_n_ : LOW VOLT DC
LINK
AL–51 Undervoltage
at DC link sec-
tion
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
AL–52 ITP signal ab-
normality I
Detects abnormality in syn-
chronization signal (ITP sig-
nal ) used in software.
Replace servo amp. PCB.
7n53 SPN_n_ : ITP SIGNAL
ABNORMAL II
AL–53 ITP signal ab-
normality II
Detects abnormality in syn-
chronization signal (ITP sig-
nal) used in hardware.
Replace servo amp. PCB.
7n54 SPN_n_ : OVERLOAD
CURRENT
AL–54 Overload cur-
rent alarm
Detects that excessive cur-
rent flowed in motor for long
time.
Remove overload of motor
and reset the alarm.
7n55 SPN_n_ : POWER
ABNORMAL
ON SWITCH
AL–55 Power line
abnormality in
spindle switch-
ing/output
switching
Detects that switch request
signal does not match power
line status check signal.
Check if power line status,
check signal is processed
normally.
7n56 SPN_n_ : INNER
COOLING FAN
STOP
AL–56 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
DECELERATIO
N POWER
AL–57 Deceleration
power is too
high.
Abnormal current flowed
through the regenerative re-
sistor.
Check the selection of the
regenerative resistor. Al-
ternatively, check whether
the cooling fan motor is ro-
tating.

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