Power supplies
94
2.
POWER SUPPLIES
Regenerative power supplies
60
DDS
HARDWARE
Ref.1310
Connection terminals for the power DC bus
At the bottom of the module, covered by the screwed-on lid on the right
(see figure F. H2/17 and figure F. H2/18) the power supply offers the termi-
nal for the power bus. This bus provides a dc voltage output of 565 V DC
(when the mains voltage is 400 V AC) that feeds all the drive modules that
are part of the DDS system.
All the modules powered with the same power supply must be connected
through the power bus and this condition is a must to run it.
Two plates are supplied with each module to join them with the adjacent
drive modules.
FAGOR power supplies have a soft-start for charging the power bus.
The soft start begins when these two conditions, that are necessary and
sufficient, are met:
No errors at the modules connected through the internal bus (connec-
tor X1).
Presence of the three mains phases at the input of the module.
This startup process begins when the FAULT indicator stops blinking and
ends when the status indicator DC BUS ON turns on.
WARNING. Never connect the power bus while the system is running.
There are voltages of about 600 V DC!
MANDATORY. The tightening torque of these terminals must be between
2.3 and 2.8 N·m. This point is very important to ensure good electrical con-
tact between modules.
WARNING. Before handling these leads, proceed in the following order:
Stop the motors
Disconnect the mains voltage at the electrical cabinet.
Wait, before handling these leads. The power supply module needs
time to decrease the voltage of the power bus down to safe values
(< 42 V DC). The green indicator DC BUS ON being turned OFF does
not mean that the power bus may be handled or manipulated.
The discharge time depends on the number of elements connected
and it is about 4 minutes.
WARNING. The power buses of different power supply modules must nev-
er be connected in parallel.
MANDATORY. If necessary, the auxiliary power supply APS-24 (24 V DC,
10 A) can only be connected to the DC bus of any regenerative power sup-
ply XPS when the version label of the APS-24 (located on top of it) indi-
cates a reference newer than PF 23A.
WARNING. Never install an APS-24 to the DC bus of a DDS system with a
regenerative power supply XPS if the reference of the APS-24 is PF 23A or
older.
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