Power line connection
POWER LINE CONNECTION
Isolating transformer or autotransformer
6.
239
DDS
HARDWARE
Ref.1310
This means oversizing the transformer or autotransformer considerably in
relation to the power of the machine. Hence, individual transformers
should not be used for each machine; instead, several machines should
be connected to a single transformer. Hence it is possible to apply simul-
taneity factors and decrease the power required by the transformer or
auto-transformer.
MANDATORY. For machines whose servo drive system includes XPS
modules, the transformer or auto-transformer must be properly sized. The
rated power of the auto-transformer must be the one resulting from apply-
ing the following formula:
Pn
= 1.4·Pmax, where Pmax is the maximum
braking power of the system. This power may be, in general, close to the
power in the S6 duty cycle of the asynchronous spindle motor. See chap-
ter
5. SELECTING CRITERIA.
WARNING. Not complying with the given indications could cause the
DDS system to perform poorly.
INFORMATION. The mains filter may be installed either before or after
the power contactor
- KM1.
MANDATORY. To obtain greater power and accelerations than what the
drives can provide, it is necessary to use an auto-transformer to raise the
power bus voltage or to have a particular regulated power supply (also
called boosting power supply, such as the FAGOR RPS). Remember that
these power supplies require chokes installed at the power line input be-
cause they are regenerative power supplies.
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