Rockwell Automation SB3000 AC Power Modules - Manual (Page 31)

Installation Guidelines 3-3
The pre-charge circuit is controlled by the PMI rack via the Pre-charge Controller
module (B/M O-55350-4). This module is located in the master inverter cabinet and
the 24V output is used to drive a pilot relay which in turn drives the pre-charge
contactor’s 115 VAC coil.
The pre-charge contactor’s auxiliary contacts are wired back to the Pre-charge
Controller Module in the SB3000 Power Module. This module expects to see the
pre-charge contactor close after energizing its coil. This condition must be met before
the drive can be put into run.
3.2.3 Line Filter Reactors
Three-phase AC line reactors are necessary to isolate the capacitor bank from the AC
line and to provide energy storage for the voltage boosting function of the SB3000
Power Module. See table 3.3. The line reactors have iron-cores, copper windings, and
1000V insulation. They are rated at 70° C (158°
F) ambient and are convection cooled.
3.2.4 Control Transformers
SB3000 control transformers should not be connected to the same AC power line that
supplies the 3-phase power to SB3000 terminals 181, 182, and 183. The SB3000
Power Module, during normal operation, introduces high-frequency line notching in
the 3-phase AC line. This type of line disturbance can be coupled through a control
transformer into all connected loads and equipment.
SB3000 control transformers that provide power to electronic power supplies, I/O
cards, PMI racks, and programmable controllers should be connected to a separate
source of AC power that is free of line noise. If a noise-free source of power is not
available, a Sola transformer, resonant filter, or a shielded, conditioning transformer
must be used.
Table 3.2 – Pre-charge Resistors and Fuses
Power Module
Rating Resistance
Resistor
P/N Fuse Rating Fuse P/N
3-Phase Fuse
Holder P/N
445 Amp
One 3.75
Ω
Resistor/Phase
402422-3A
15 Amps, 600V
RK5 or Equivalent
64676-1BW 49454-21C
890 Amp
Two 1.65
Ω
Resistors/Phase
(3.3
Ω
/Phase)
402422-3C
20 Amps, 600V
RK5 or Equivalent
64676-1BX 49454-21C
1,335 Amp
Two 1.65
Ω
Resistors/Phase
(3.3
Ω
/Phase)
402422-3C
20 Amps, 600V
RK5 or Equivalent
64676-1BX 49454-21C
Table 3.3 – Line Filter Reactor Ratings
Power Module Inductance Frequency
Harmonic Current
at 4kHz
445 Amp 500 µH at 534 Amp 23 to 62 Hz 15%
890 Amp 250 µH at 972 Amp 23 to 62 Hz 15%
1,335 Amp 167 µH at 1457 Amp 23 to 62 Hz 15%