Troubleshooting
6-128 Manual # 42-02-7223
Replacing SCRs and Diodes
SCR devices are located on and near the drive heatsinks. There are 6 SCR devices (12 Pulse
Bridge) on the heatsink located in the middle of the drive. Three SCR devices (Direction Bridge
and Dynamic Braking) are on the top-most heatsink in the drive. Just below the top-most heat-
sink is a combination SCR/Diode device and a dual Diode device.
Replacing the 12 Pulse Bridge SCRs (SCR1 - SCR6) Be sure to mark all
wires for identification before removing them. They must be correctly replaced.
Figure 6.26 12 Pulse Bridge (SCR1 - SCR6)
Table 6.36 Replacement Parts for SCRs and Diode Devices
ITEM (DESCRIPTION) MCE PART # UNIT
SCR (162 Amp 1600V SCR Pack) 33-03-0011 Each
Heatsink Gasket (Heatsink Gasket, SCR 162 Amp) 41-06-0021 Each
Standoff (M6 x 16MM Standoff) 41-04-0036 Each
Split Washer (1/4" Split Washer) 19-04-0013 Each
Mach. Screw (1/4-20 x 3/4" Mach. Screw) 19-01-0065 Each
Thermal Compound Spray Non-Silicone 13-01-0020 A/R
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