Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control - Manual (Page 94)

94 Rockwell Automation Publication 7000-UM202B-EN-P - June 2014
Chapter 3 Component Definition and Maintenance
Replacing Heat Sinks
The copper heat sinks can weigh about 9 kg (20 lb), while the aluminum heat
sinks will weigh approximately 4 kg (9 lb).
1. Isolate and lock out all power to the drive.
2. Remove the load from the clamp head as described in Checking Clamping
Pressure on page 89 .
3. Completely remove the SGCT or SCR from the heat sink that is being
replaced (see
Replacing the SGCT on page 69 or Replacing SCR and SCR
Self-Powered Gate Driver Boards (SPGDB) on page 86 ).
4. There are two bolts that secure the heat sink to the PowerCage. They are
13-mm bolts, and must be removed using several extenders to get the
socket wrench out past all the sensitive gate driver boards.
5. Loosen the two bolts and carefully remove the heat sink from the
PowerCage.
6. Install the new heat sink and hand-tighten the bolts.
7. Replace the SGCT or SCR (see Replacing the SGCT on page 69 or
Replacing SCR and SCR Self-Powered Gate Driver Boards (SPGDB) on
page 86
).
8. Follow procedure Uniform Clamping Pressure on page 88 to ensure the
heat sinks are clamped to a uniform pressure.
ATTENTION: To prevent electrical shock, disconnect the main power before
working on the drive. Verify that all circuits are voltage free using a hot stick or
appropriate voltage-measuring device. Failure to do so may result in injury or
death.
ATTENTION: If present, remove plastic film from the heat sink before
installation. Failure to remove the film will result in device failure.