Rockwell Automation 1395 Digital DC Drive - Manual (Page 24)

Publication 2361-5.01 July 1998
1-12 Product Overview
Power Components This section will break down and define the incoming power,
armature power, and field supply components.
Incoming Power Components
Incoming Devices
The 1250 and 1650A DC drives are intended to be used straight from
the customer-supplied, power controlled incoming lines, without any
additional isolation transformer or line chokes (however, adding
either of these would increase isolation to other equipment on the
power lines).
The 3000A DC drive does not require an isolation transformer or line
reactors if it is the only equipment on the power lines. However, if it
shares power with other equipment on the same power lines, it will be
necessary to use either line reactors or an isolation transformer ahead
of the drive.
The system designer needs to provide proper circuit impedence to
limit the short circuit currents according to the breaker derating charts
given in Appendix A.
Some drives may require an output inductor in series with the
armature, especially for older machines which do not have enough
internal inductance for a proper armature commutation process.
AC Input Busbars
Tin plated busbars are supplied for all input connections through the
top of the disconnect bay. Busbar dimension diagrams are given in
Appendix A.
Main Disconnect (Optional)
A 3-phase circuit breaker can be supplied on the incoming line for
each high-horsepower drive. Appendix A lists circuit breaker
specifications, and shows diagrams of the circuit breakers settings for
the 1250, 1650, and 3000A DC drives.
AC Line Fuses (Optional)
AC line fuses can be supplied for the 3-phase incoming power.
Note: Units require either a main disconnect or AC line fuses.