Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control (PanelView 550) - Manual (Page 142)

4-16
Component Definition and Maintenance
7000A-UM151D-EN-P – March 2013 7000 “A” Frame
1. Ensure there is no power to the equipment.
A T T E N T I O N A T T E N T I O N To prevent electrical shock, ensure the main
power has been disconnected 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.
2. Note the position of the fiber optic cables for assembly.
3. To remove the SGCT, it is necessary to remove the gate driver power cable
and fiber optic cables. Exceeding the minimum bend radius (50 mm
[2 in.] ) of the fiber optic cables may result in damage.
A T T E N T I O N A T T E N T I O N The fiber optic cables can be damaged if struck
or bent sharply. The minimum bend radius is 50
mm (2 inches). The connector has a locking
feature that requires pinching the tab and gently
pulling straight out. The component on the
printed circuit board should be held to prevent
damage.
4. Remove the load on the clamp head assembly as described on page
6-19.
5. Two brackets secure the board to the heatsink. Loosen the captive
screws until the circuit board is free. It may be necessary to adjust the
position of the heatsinks to allow free movement of the SGCT.
6. Slide the circuit board straight out.
A T T E N T I O N A T T E N T I O N The SGCT can be destroyed or damaged by static
charges. Personnel must be properly grounded
before removing the replacement SGCT from the
protective anti-static bag that it is supplied in.
Use of damaged circuit boards may also damage
related components. A grounding wrist strap is
recommended for handling sensitive circuit boards.
I M P O R T A N T I M P O R T A N T Replacement SGCTs will be supplied, grouped in
matched sets. This means that all of the SGCTs
in a leg have been grouped together based on
their electrical performance. Grouping similarly
matched devices ensures balanced load sharing of
a leg of devices. When replacing the device, it is
necessary to replace all the SGCTs in a matched
set, even if only one has failed.
Symmetrical Gate
Commutated Thyristor
Replacement (cont.)