Assembly Replacement (180 - 350A DC)

ManualsBrandsRockwell Automation ManualsEquipment2364,2364E NRU Diode Bridge

Publication 2364E-5.10 - April 1998

EPLACEMENT

NSTRUCTIONS

NRU™ Diode Bridge Assembly

Replacement (180 - 350A DC)

Contents In 180A DC and 350A DC NRUs, all 6 diodes (D1 - D6) and the both

the positive and negative heatsinks (HS1 - HS2) can be replaced

together as a single unit.

This publication describes how to replace the diode bridge assembly

in 180A DC and 350A DC non-regenerative, front-end units (NRU).

What This Kit Contains Using the table below, verify that you have received the appropriate

items in your kit:

Other Items Needed Before you begin, be sure you also have the following:

• Whatever tool(s) you will need to:

• Remove and connect line fuses and AC busbars

• Disconnect and connect wires

• Remove, loosen, and/or tighten bolts

• Torque bolts

• Documentation:

• Your drive system schematics

• Publication 2364E-5.01, Non-Regenerative DC Bus Sup-

ply (NRU) User Manual

For this part: You should receive this quantity:

diode bridge assembly 1

Summary of content (8 pages)

PAGE 1
REPLACEMENT KIT INSTRUCTIONS NRU™ Diode Bridge Assembly Replacement (180 - 350A DC) Contents In 180A DC and 350A DC NRUs, all 6 diodes (D1 - D6) and the both the positive and negative heatsinks (HS1 - HS2) can be replaced together as a single unit. This publication describes how to replace the diode bridge assembly in 180A DC and 350A DC non-regenerative, front-end units (NRU).
PAGE 2
NRU™ Diode Bridge Assembly Replacement (180 - 350A DC) Safety Precautions The following general precautions apply to NRUs and their respective drive systems: ! ATTENTION: Only those familiar with the drive system, the products used in the system, and the associated machinery should plan or implement the installation, startup, and future maintenance of the system. Failure to comply can result in personal injury and/or equipment damage.
PAGE 3
NRU™ Diode Bridge Assembly Replacement (180 - 350A DC) Removing the Diode Bridge Assembly 3 This section contains the procedure for removing the diode bridge assembly. 1. Disconnect AC busbars at arrows shown in Figure 1. Figure 1 Illustration of Where to Disconnect AC Busbars 2. Disconnect both of the "Heatsink-Over-Temperature" switches, at the quick-disconnect connectors located near the top of the left heatsink. Refer to arrow in Figure 2.
PAGE 4
NRU™ Diode Bridge Assembly Replacement (180 - 350A DC) 3. Disconnect the wire between suppressor diode D11 at the center top of the left heatsink. 4. Disconnect the wire between suppressor capacitor C11 at the center top of the right heatsink. 5. Disconnect the DC output power wires from the heatsink busbars located near the bottom of the right heatsink. Refer to arrows in Figure 3. Figure 3 Location of DC Power Connections 6.
PAGE 5
NRU™ Diode Bridge Assembly Replacement (180 - 350A DC) 5 7. Loosen, but do not remove, the 2 lower bolts that hold the heatsink red Glastic™ L-brackets to the subpanel. 8. While supporting and preventing the heatsink from falling forward, remove the 2 upper bolts that hold the heatsink red Glastic L-brackets to the subpanel. Note: The diode bridge assembly weighs approximately 25 lb (11kg). 9.
PAGE 6
NRU™ Diode Bridge Assembly Replacement (180 - 350A DC) Figure 6 Power Bridge Without AC Busbars and Line Fuses Installing the Diode Bridge Assembly Follow this procedure to install the diode bridge assembly. 1. Reconnect AC busbar/line fuse assembly to the bridge assembly and torque bolts to 25 lb-ft (34 N-m). Refer to Figure 5. 2. Position and hold the new diode bridge assembly on the 2 loosened lower bolts. Note: The diode bridge assembly weighs approximately 25 lb (11kg). 3.
PAGE 7
NRU™ Diode Bridge Assembly Replacement (180 - 350A DC) 7 9. Reconnect both of the "Heatsink-Over-Temperature" switches, at their respective quick-disconnect connectors located near the top of the left heatsink (Refer to Figure 2). 10. Reinstall AC line fuses F1, F2, and F3 and their respective AC input busbars (Refer to Figure 1). Torque bolts to 25 lb-ft (34 N-m). 11. Dispose of the removed part according to your company’s procedures and local ordinances. Publication 2364E-5.
PAGE 8
NRU is a trademark of Rockwell International or its subsidiaries. Lexan is a trademark of General Electric Corp. Publication 2364E-5.10 - April 1998 Supersedes Publication 2364E-5.10 - June 1997 P/N 173345  1998 Rockwell International. All Rights Reserved.