
B-63943EN/02 4.POWER SUPPLY CONNECTION
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<2> Circuit examples that exceed the output voltage specifications
(21.6 V to 26.4 V) due to an abrupt load change
Example 1
C input
C input
Example 2
Regulated
power supply
Device with
remarkable load
fluctuations
Device with large
rush current
CNC unit
CNC unit
Regulated
power supply
For a circuit configuration in <2>, connect another regulated power
supply to be specifically used for the device with remarkable load
fluctuations so that the CNC and other units are not affected.
Avoid the use of a configuration in <2> if possible, even in an
environment with small load fluctuations or rush current. When two
or more units are connected to the same power supply, the 24-VDC
power may not be turned on due to a failure in a unit other than the
CNC. If this happens, it takes much time to locate the failure
because the CNC cannot start and no alarm indication is provided.
When the CNC and other units are connected to the same power
supply because of limited space for the power magnetics cabinet or for
some other reason, careful consideration must be given to possible
rush currents and voltage fluctuations. In addition, to prevent power
supply noise from entering the CNC, a noise filter must be inserted
before the power to the CNC. (Recommended noise filter:
ZGB2203-01U manufactured by TDK)