Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020 299
Component Definition and Maintenance Chapter 5
Figure 246 - SCR and SPGDB assembly
Detachment of Coolant
System from PowerCage
Modules
In the event that service is required to snubber components, it will be necessary to
extract a chill block assembly from a converter PowerCage module in order to
access the snubber and sharing resistors. To avoid draining coolant from the
entire converter, it is possible to isolate the fluid path of one converter module
from the remainder of the drive using the following technique:
1. Ensure that power has been disconnected.
2. Ensure all pumps have been turned off. Allow the system to cool down
before servicing any components in the coolant system.
3. Remove all SCR/SGCT devices and their circuit boards as outlined in
Silicon Controlled Rectifier and SCR Self-Powered Gate Driver Board
Replacement on page 296 and Symmetrical Gate Commutated Thyristor
Replacement on page 293.
4. Drape a waterproof plastic sheet over all the devices under the PowerCage
being serviced. Personnel must wear suitable protective personal gear to
avoid direct contact with the coolant (ethylene glycol – water mixture).
5. Two flow restrictor clamps per Figure 247
are provided with the spare
parts kit of each drive.
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