Fagor APS-24, Hardware Manual

Page: 44 / 386

   Power supplies
94
2.
POWER SUPPLIES
Non
-re
gen
erative pow
er
su
ppli
es
44
DDS
HARDWARE
Ref.1310
Derating curves
The power these resistors can dissipate depends on the ambient temper-
ature according to the following derating curves.
Connection terminals for the power DC bus
At the bottom of the module, covered by a screwed on lid, the power sup-
ply offers the terminal 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 servo drive system.
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 two necessary and sufficient conditions are
verified:
• No errors on any of the modules connected through the internal bus
(connector 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.
F. H2/10
Derating curves of the ballast dissipation power on non-regenerative pow-
er supplies.
INTERNAL BALLAST
POWER (W) PS-25B4
400
280
35/95 45/113
°C/°F
INTERNAL BALLAST
POWER (W)
PS-65A
900
600
15/59 45/113
°C/°F
MANDATORY. All the modules powered by the same power supply must
be joined by the same power bus. This condition is a must for the system to
work.
WARNING. Never connect the power bus while the system is running.
There are voltages of about 600 V DC!
WARNING. Please note that the STO ( S afe T orque O ff) safety function
does not imply an electrical power off. There is still voltage at the DC bus.
Ignoring this warning may cause electric shock.
MANDATORY. The tightening torque of these terminals must be between
2.3 and 2.8 Nm. This point is very important to ensure good electrical con-
tact between modules.
INFORMATION. For PS-25B4 power supplies, it is enough to have two
mains phases.
i