Fagor DDS Series Hardware Manual page 84

  Power supplies
2.
94
DDS
HARDWARE
Ref.1912
· 84 ·
Connection terminals for the power DC BUS
At the bottom of the module, at both ends and covered by the screwed-on
lid (see figure F. H2/35), these power supplies offer the terminals for the
power bus (DC BUS) at both ends.
MANDATORY. Use the terminals of the power DC BUS located at the end
easiest to install the DDS system.
This bus provides a dc voltage output. Set the switches (located on top of
the status display) properly to determine its magnitude. The selected bus
voltage will stay constant regardless of the line voltage. See figure F. H2/39
that shows how to set these switches to select the desired bus voltage.
This voltage set at the power bus can supply all the drives that make up the
DDS system.
MANDATORY. All the modules powered with the same power supply must
be connected through the power bus. This condition is a must to run it.
WARNING. Never connect the power bus while the system is running.
There are voltages of 600 V DC and 725 V DC!
Two plates are supplied with each module to join them with the adjacent
drives.
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
contact between modules.
FAGOR power supplies have a soft-start for charging the power DC 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 (connector
X1 at the drives and X4 at the RPS power supplies)
 Presence of the three line phases at the input of the module.
This startup process begins when the FAULT indicator stops blinking and the
status indicator DC BUS ON turns on.
WARNING. Before handling these leads, proceed in the following order:
 Stop the motors.
 Disconnect the line 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
(< 60 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
never 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
supply RPS when the version label of the APS-24 (located on top of it)
indicates a version newer than PF 23A.