Rockwell Automation SA3100 AC Power Modules - Manual (Page 27)

Installation Guidelines 3-9
3.4 Installing a Line Input Disconnect
A supply line disconnect must be provided in the incoming power lines in accordance
with NEC/CEC guidelines. Size the disconnect according to the in-rush current, as
well as any additional loads the disconnect may supply. The trip rating for in-rush
current (8 to 14 times the full load current) should be coordinated with that of the input
isolation transformer or reactor, if used. See section 3.3.
3.5 DC Input (Common Bus) Supply Requirements
DC input Power Modules have the same power requirements as the AC equivalent
models. On small (B frame) common bus Power Modules, the negative DC bus is
applied to the R-L1 input (TB1-5). The positive DC bus is applied to the T-L3 input
(TB1-7). See figure 3.7 and Appendix C.
On C frame and larger common bus Power Modules, the DC bus is connected directly
to the DC+ and DC– terminals on terminal block TB1. See figures 3.8 to 3.10 and
Appendix C.
The DC bus power for the Power Module may be supplied by a diode rectifier, a phase
controlled rectifier, a synchronous rectifier, or a more complex combination of
rectifiers that supply unregulated or regulated DC power to the Power Module’s DC
bus. In addition, the DC bus supply may also include snubber dissipation or
regenerative capability.
Prior to applying power to any Power Module, operation of the DC bus supply should
be checked for proper connections, proper operation, correct voltage levels, and
correct polarity at the Power Module’s termination points. Refer to the appropriate
installation and setup instructions for your system’s specific equipment.
Common Bus Input Line Fuses
Common Bus Power Modules require input fuses comparable to those listed in table
3.1 in the following section. See Appendix C for detailed fuse recommendations for
use with the common bus units.
3.6 Input Line Fuse Selection
SA3100 Power Modules do not provide input power short circuit fusing. Specifications
for the recommended fuse size and type to provide Power Module input power
protection against short circuits are provided in table 3.1. Branch circuit breakers or
disconnect switches cannot provide this level of protection for Power Module
components.
!
ATTENTION: The NEC, CEC, and IEC require that a supply circuit
disconnect be provided in the incoming power lines. Failure to observe
this precaution could result in severe bodily injury or loss of life.
!
ATTENTION:Use only the recommended line fuses specified in table
3.1. Branch circuit breakers or disconnect switches cannot provide this
level of protection for Power Module components.