
4.POWER SUPPLY CONNECTION B-63943EN/02
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- Notes to take when the vertical axis exists
When the vertical axis exists, select the DC power supply that has a
long voltage hold time to decrease the amount of vertical axis falling
during power-off (including a power failure).
If the operating voltage drops to less than or equal to 21.6V, the CNC
releases servo activation. Therefore, when the hold time for 24 VDC
during AC power-off is too short, servo activation is released before
the breaks are applied because some peripheral circuit detects
power-off. This may increase the amount of vertical axis falling.
Generally, a power supply with sufficient power capacity tends to
increase the hold time during power-off.
- Circuit configurations
The following circuit configurations are not recommended.
Forbidden
<1> Circuit examples that cannot retain the output voltage at an
instantaneous interruption (the voltage reduces to 21.6 V or
below)
Example 1
Rectifier
circuit
CNC unit
C input
C input
Example 2
CNC unit
Rectifier
circuit
NOTE
The rectifier circuit means a circuit using diodes for
full-wave rectification.