Rockwell Automation 20G PowerFlex SCR Bus Supply User Manual
Page 27
Installation/Wiring
1-13
PowerFlex SCR Bus Supply User Manual
active front end that is used only as a regenerative brake unit. The
PowerFlex SCR Bus Supply will then deliver the required motoring
power and the RGU/AFE will provide the possibility to feed the
regenerative energy back to the AC power line.
The auto-voltage
limitation (allowing the SCRs to phase back) associated with high AC
line will be disabled. The left (RGU/AFE) jumper position provides the
best protection for parellel SCR and RGU/AFE operation.
• SPARE 2 Jumper: For board firmware version 1.21 (or earlier), this
jumper is non-functional. For firmware version 1.22 (or later), this
jumper is used for slow ramp-up, which slows the DC bus voltage charge
up time (from 0.2 to 1.3 seconds). Slow ramp-up should be used when
the connected DC bus capacitance is greater than the values shown in the
following table.
To operate the SCR Bus Supply with a slow ramp-up, set the SPARE 2
jumper to the left (SLOW) position.
For standard applications where only the PowerFlex SCR Bus Supply
provides the required common DC power, make sure the SPARE 1 and
SPARE 2 jumpers are in their default settings (right side—towards the
board edge) shown in
Figure 1.9
.
Figure 1.9
Location of LED Indicators and Jumpers on the Precharge Board
SCR Bus Supply
Max. Bus Capacitance
(1)
with Normal Ramp
(1)
It is recommended to derate the capacitance value by 20% in master/slave configurations.
Max. Bus Capacitance
(1)
with Slow Ramp
400A
40,000 µF
200,000 µF
600A
60,000 µF
300,000 µF
1000A @ 480V
100,000 µF
500,000 µF
1000A @ 690V
50,000 µF
250,000 µF
SPARE
2
(Ramp-Up)
Precharge Board
Firmware Version Label
(SCR and
RGU/AFE
Paralleling)
Slow Norm
Yes No
1-ph 3-ph
SPARE
1
LINE
TYPE
POWER
OK
ALARM
LEDs
Jumpers sho
wn in
def
ault positions
FAULT
TIP: To identify the firmware version, remove the SCR Bus Supply cover
and check the firmware version label on the Precharge Board (
Figure 1.9
).