Fagor DDS Series Hardware Manual page 222

   Selection criteria
5.4 Capacitor module selection guide
5.
224
DDS
HARDWARE
Ref.1912
· 222 ·
The CM-1.75 is a capacitor module that increases the electrical capacitance
of the power bus in 7380 µF. It should be installed on machines with very
short duty cycles (very repetitive accelerations and decelerations) and with
low braking energy (e.g. a punch press).
The following table indicates how much extra energy W is stored in (Ws)
when the bus voltage increases from the rated value VBUS to the Ballast
circuit activating voltage (also called Crowbar activation voltage, VCrowbar).
Considering the different combinations of power supplies modules + CM-
1.75 and different mains voltage.
W= C/ 2 * [ V²
with units:
C in Farads
V CROWBAR in volts
V BUS = 2·Vmains in volts
W in Ws  jules
T. H5/15 Extra energy that may be stored (in Ws).
Modules Capac.
(µF)
PS-25B4 820
PS-65A 940
XPS-25 1175
XPS-65 2520
PS-25B4+CM-1.75 8200
PS-65A+CM-1.75 8320
XPS-25+CM-1.75 8555
XPS-65+CM-1.75 9900
V² ] (Ws )
CROWB AR - B US
Crowbar Crowbar W (Ws)
activation deactivation for
voltage voltage Vmains
(V) (V) 400 V
770 760 111.9
770 760 128.3
770 760 160.3
770 760 343.8
770 760 1118.9
770 760 1135.2
770 760 1167.3
770 760 1350.8
W (Ws)
for
Vmains
460 V
69.6
79.8
99.7
213.8
695.7
705.9
725.9
840.0