Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 377)

Component Definition and Maintenance 6-33
7000 “C” Frame 7000L-UM300I-EN-P – June 2013
Figure 6.24 – SCR and SPGDB assembly
In the event that service is required to snubber components, it will be
necessary to extract a chillblock 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 “Replacing the Silicon Controlled Rectifier” and “SGCT
Replacement”.
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 6.25 are provided with the
spare parts kit of each drive.
Detachment of Coolant
System from
PowerCage Modules