Fagor DDS Series Hardware Manual page 47

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 DC BUS down to safe values
(< 60 V DC). The green indicator DC BUS ON being turned OFF does
not mean that the power DC BUS may be handled or manipulated.
 The discharge time depends on the number of elements connected and
it is about 4 minutes.
WARNING. Never connect in parallel the power DC BUS of different power
supplies.
MANDATORY. Install an auxiliary power supply APS-24 (24 V DC, 10 A) to
the DC BUS of any DDS system with non-regenerative power supply PS-
65A (mandatory) or PS-25B4 (suggested, not mandatory).
INFORMATION. Do not install external protection fuses in these power lines
i
of the auxiliary power supply. They are already integrated in the power
supply itself.
Remember that the purpose of connecting an auxiliary power supply APS-
24 to the DC BUS of a DDS system is to ensure the supply to all the control
circuits of the power supply and of the drives connected to the DC BUS in
case of a mains power outage in the auxiliary power supply ensuring a
controlled stop of the moving axes instead of braking out of control by
friction.
Bear in mind that the PS-65A power supplies do not come with internal
auxiliary power supply for their own control circuits and for those of the
modules connected to the DC BUS as well as other elements like fans, etc.
That is why it is a must to install the APS-24 auxiliary power supply to do
the installation properly.
PS-25B4 power supplies do come with an internal auxiliary power supply
(24 V DC and a total of 8 A, 192 W). Therefore, it is not a must to install an
APS-24 next to them, but it is highly suggested because, sometimes,
higher power may be required to feed the control circuits of the modules
than what the internal auxiliary power supply can provide (when installing a
lot of drives).
Observe that the APS-24 auxiliary power supply offers 3 outputs with 24 V
DC and a total of 10 A, 240 W.
For further information about the auxiliary module APS-24, see chapter 4.
AUXILIARY MODULES in this manual.
  Power supplies
2.
DDS
HARDWARE
Ref.1912
· 47 ·