Rockwell Automation 2364P Parallel DC Bus Supply Config. - Manual (Page 24)

Publication 2364P-5.01 December 1999
1-12 Theory of Operation
The RGUs will precharge the capacitors on the bus until the bus
voltage rises to be equal to the line voltage. Then, the precharge
circuit will open, the main circuit will close, the NRU circuit breaker
will close, and the DC bus voltage will rise to 1.35 times the line
voltage.
Figure 1.19
Precharge Voltage
!
ATTENTION: If there is too much capacitance on the
DC bus, the RGUs may not be able to raise the bus
voltage to the threshold for normal operation, resulting
in damage to equipment.
T im e
DC
B
u
s V
o
lt
ag
e
t 0 se c
0 V D C
1.3 5 x V A C
1 x V A C
P re ch arg in g
N o rm al D io d e-B rid g e
O p eration
Un a b le to P re ch arg e
(T oo m a n y in v erte rs )