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Rockwell Automation Publication 20P-TG001C-EN-P - February 2018
Chapter 3
Part Replacement Procedures
SCR Module Replacement
Remove the SCR Modules
Follow these steps to remove the SCR modules.
1. Read the General Safety Precautions on page
2. Remove power from the drive (see page
3. Remove the protective covers (see page
).
4. Remove the control EMI shield and control circuit board (see page
).
5. Remove the pulse transformer and switching power supply circuit
boards (see page
).
The drive rating determines how the power bridge of the drive is
configured and the steps that are required to remove the SCR modules:
• To remove the SCR modules from a frame A drive that is rated up to
55 A/15 Hp with 230V AC input or up to 52 A/30 Hp with 460V
AC input, see SCR Modules on Drives Rated up to 55 A/15 Hp with
230V AC Input or up to 52 A/30 Hp with 460V AC Input on page
• To remove the SCR modules from a frame A drive rated 73 A/20 Hp
with 230V AC input and higher or 73 A/40 Hp with 460V AC
input and higher, see SCR Modules on Drives Rated 73 A/20 Hp
with 230V AC Input and Higher or 73 A/40 Hp with 460V AC
Input and Higher on page
IMPORTANT
For regenerative drives, the SCR modules must be replaced in pairs for each
input phase in order that the gating resistance of each pair of modules is the
same.