Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C-Frame) - ForGe Control User Manual
Page 299
Rockwell Automation Publication 7000L-UM301D-EN-P - June 2014
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
Symmetrical Gate Commutated Thyristor
.
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
are provided with the spare
parts kit of each drive.