7
Instruction Booklet
IB48050
Effective September 2012
Instructions for installation,
operation, and maintenance of the
AMPGARD 15 kV, 300A vacuum starter
eaton Corporation
www.eaton.com
Low voltage control
The low voltage control compartment is located in a steel pocket in
the medium voltage door . A low voltage door with up to four device
panels provides access to the low voltage compartment with the
medium voltage door closed . The low voltage compartment swings
out of the way with the medium voltage door as it is opened,
allowing access to the isolation switch, fuses, main contactor,
and other starter components that are mounted behind the
low voltage compartment .
A row of control terminal blocks is provided on the left side of the
controller . They can be accessed by opening the low voltage door .
The blocks are fixed mounted and remain in place when the medium
voltage door is opened . Refer to
Figure 11
and
Figure 12
for details .
Figure 11. LV Terminal Blocks, MV Door Open
Figure 12. LV Terminal Blocks, LV Door Open
A test plug and receptacle are typically supplied inside the low
voltage section . The receptacle is wired to the secondary of the
controller control power transformer . Test power can be used to
energize the control circuit by removing the plug from the receptacle
and using a standard extension cord to energize the plug . Refer to
Figure 13
for specific location .
Test Plug
Figure 13. LV Compartment with Test Plug
m
Danger
Do not connect test power to the starter control circuit
without removing the plug from the receptacle. failure to Do
so will result in a back-feeD conDition on the control power
transformer, which will generate high voltage insiDe the
controller with the isolation Device open. high voltage can
cause severe injury or Death.
Current transformers
A three-phase CT is provided as standard on all starters . The
standard mounting location for the CT is under the motor load
connection assembly . The three CTs in the assembly are provided
with the proper ratio and output burden to work properly with the
overload relay supplied in the control compartment .
Three-Phase
CT
Figure 14. Standard CT Mounting