Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020 305
Component Definition and Maintenance Chapter 5
3. When sure that the chill block stabs are properly positioned replace the
M8 and M10 bolts and tighten. Magnetized sockets are recommended
with 40 cm extensions.
4. Re-connect the coolant system to the chill blocks. Reconnecting the
coolant system before re-installing the SCR/SGCTs ensures no coolant is
spilled on the devices or circuit boards.
5. Replace SCR/SGCT and circuit boards explained in Symmetrical Gate
Commutated Thyristor Replacement on page 293 and Silicon Controlled
Rectifier and SCR Self-Powered Gate Driver Board Replacement on
page 296.
6. Readjust the clamping load as described in Checking Clamping Pressure
on page 292.
PowerCage Removal and
Replacement
1. Ensure there is no power to the equipment.
2. Before removing the PowerCage, all the components located within the
PowerCage need to be removed to avoid any damage to the components.
Consult the required sections to remove clamping pressure, SGCT and
SCR boards, detachment of cooling system, and chill block removal.
3. With all the components removed, detach the manifold assembly by
removing the bolts on the outer flange. Carefully lift the PowerCage down,
placing the front face down. Do not overtorque these bolts when replacing
the PowerCage.
4. When replacing the PowerCage, it is important to place the bolts on the
outer flange loosely. Torque bolts alternately on one flange and then the
opposite flange to ensure even tightening of the module. A suggested
sequence for torquing PowerCage bolts is shown in Figure 254
.
ATTENTION: To prevent electrical shock, ensure the main power has
been disconnected before working on the drive board. 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: The SGCT and SCR can be destroyed or damaged by static
charges. Personnel must be properly grounded before removing circuit
boards from the PowerCage. Use of damaged circuit boards may also
damage related components. A grounding wrist strap is recommended
for handling.
The PowerCage is heavy and it is preferred that two people should
extract the PowerCage from the drive to prevent injury or damage.
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