Power supplies
POWER SUPPLIES
Non-regenerative power supplies
2.
45
DDS
HARDWARE
Ref.1310
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 con-
trol circuits of the power supply and of the drive modules connected to the
DC bus in case of a mains power outage in the auxiliary power supply en-
suring a controlled stop of the moving axes instead of braking out of con-
trol 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 drive modules).
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.
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. Never connect in parallel the power buses 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 of the auxiliary power supply. They are already integrated in the
power supply itself.
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