66 Rockwell Automation Publication 20Y-TG001C-EN-P - April 2017
Chapter 6 Precharge Component Section
Precharge Functions
The precharge circuitry has two main functions:
• Provides AFE system control power.
• Provides the precharge circuitry to charge the DC bus.
The AFE system is available in both 400/480V AC and 600/690V AC system
voltage configurations. Control logic voltages are as follows:
• For an AFE in an IP20 2500 MCC Style enclosure, it is 120V AC
single-phase and also 24V DC power.
• For an AFE in an IP21 Rittal enclosure, it is 230V AC single-phase and
also 24V DC power.
The precharge circuitry lets the DC capacitors, which are located in the AFE
power structure, to be properly charged with in-line current limiting resistors
to DC bus voltage magnitudes.
See the PowerFlex Active Front End User Manual, publication 20Y-UM001
,
for the minimum and maximum system capacitance requirements.
Replace the Precharge Fuse
The precharge fuse assembly for an AFE in an IP20 enclosure is located in the
power structure enclosure. For an AFE in an IP21 enclosure, the precharge fuse
assembly is located in the LCL filter enclosure.
To replace the precharge fuse, follow these steps.
1. Remove power from the AFE.
See Remove Power from the AFE
on page 37.
2. Open the appropriate enclosure door.
3. If present, remove the protective barriers.
See Remove AFE Protective Barriers
on page 44.
4. Slide the fuse sleeve out from the fuse holder.
5. Remove the fuse from the sleeve and appropriately discard the old fuse.
6. See the appropriate table for the recommended new replacement fuse,
and install the fuse in reverse order of removal.
Table 4 - 400/480 Volt Precharge Fuse Rating
Frame
Size
Enclosure Style Fuse Fuse Holder
(1)
(1) Fuse holder holds a quantity of three fuses.
Amps Type Type
10 IP20 2500 MCC 30 Bussmann DFJ-30 Bussmann CH30J3
IP21 Rittal 32 ABB OFAF000H32 ABB O540D12000
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