Rockwell Automation 20D DC SCR Precharge Module - Manual (Page 14)

1-4 Installation/Wiring
(girder, joist), a floor ground rod, bus bar or building ground grid.
Grounding points must comply with national and local industrial safety
regulations and/or electrical codes.
Fuses The DC SCR Precharge Module is designed for internal application inside
the drive(s) enclosure. The customer may install the external DC bus fuses
if the fuse protection does not exist inside the drive. National and local
industrial safety regulations and/or electrical codes may determine
additional requirements for these installations.
Minimum Capacitance To operate and test the module, at least one drive must be connected at the
power terminals “+DCin” and “+DCout” to provide a minimum DC bus
capacitance (470 microfarads). One 7.5 kW (10 HP) PowerFlex
®
700H or
PowerFlex 700S drive provides the required minimum capacitance.
Important: If the drive (inverter) is disconnected from the DC bus, the DC
SCR Precharge Module internal fault detection circuit will not
interpret the condition as a “Precharge Not Completed” and
will not stop gating the SCR.
Maximum Loading To avoid overloading the DC SCR Precharge Module, the following
requirements apply:
• The DC input current sum (Normal Duty rating at 50°C/122°F) of the
connected drive(s) must not exceed the continuous DC bus output
current rating of the DC SCR Precharge Module at 50°C/122°F.
• Multiple drives may be connected as long as the maximum current rating
is not exceeded.
For the DC input current values of the drives (PowerFlex 700H, PowerFlex
700S or 1336 PLUS

II), please refer to tables in Appendix A of their
respective User Manuals.
Table 1.A shows examples for maximum loading of the DC SCR Precharge
Module when it is used for PowerFlex 700H or PowerFlex 700S drive
applications.
Table 1.A Maximum Loading when Used with PowerFlex 700H/700S Drive(s)
DC Input Rating of Connected Drive(s) DC SCR Precharge Module Drive(s)
700H/700S
Frame Size Normal Duty
Input DC Amps Input DC
Voltage Rated Cont.
DC Amps
Part Number
Normal Duty
Output AC Amps Output
AC Volts
10 490A 650V 500A 370696 460A 460V
11 690A 650V 750A 370711 650A 460V
12 870A 650V 1000A 370715 820A 460V
13 1507A 650V 1600A 370707 1421A 460V