
B–62835EN/01
8. TROUBLESHOOTING
287
This alarm is generated when absolute pulse coder battery becomes low.
If alarm 306 occurs, the reference position has been lost. After replacing
the battery, re–set the reference position.
WARNING
When replacing the memory backup batteries, keep the
power to the machine (CNC, servo amplifier) switched on,
and hold the machine at an emergency stop. Because this
work must be carried out while the power is kept switched
on and the cabinet is open, only the personnel who have
been trained for safety are allowed to engage in the work.
When replacing the batteries, be careful not to touch the
high–voltage circuit section (marked and shielded with
a shock hazard prevention cover). If you touch the
high–voltage circuit section when it is uncovered, you will
get an electric shock.
Replace the batteries in the α series servo amplifier module, the β series
servo amplifier, or the separate battery box.
CAUTION
1 When replacing the built–in batteries for the series servo
amplifier module or β series servo amplifier module, keep
the power to the servo amplifier switched on.
2 When replacing the batteries in the separate type battery
box, keep the power to the NC and servo amplifier switched
on.
3 Note that we are not supposed to replace the batteries for
the control unit (for memory backup).
8.14
ALARM 306 TO 308
(ABSOLUTE PULSE
CODER BATTERY IS
LOW)
Absolute pulse coder
battery replacement
Procedure