KEPCO BOP 1KW-MG Operator Manual, Firmware Ver.4.12 and higher - Manual (Page 48)

2-10
BOP HIPWR 031014
FIGURE 2-2. EARTH GROUND CONNECTION RECOMMENDATIONS
EXT
REF
SGND
ANALOG
I/O PORT
COM
OUT
LOAD
IOUT
PROGRAMMING
DEVICE
BOP 1KW
LOAD
SGND COM
EXT
REF
PROGRAMMING
DEVICE
BOP 1KW
OUT OUT
I
CONNECTION
MISSING
ANALOG
I/O PORT
With two earth-ground points as
shown, a ground loop allows return
current to flow through the internal
circuits of the BOP as well as through
the proper return path.
With two earth-ground points as
shown, if the return connection from
the load to BOP COM is missing, all
the output current flows through the
internal circuits of the BOP causing
catastrophic damage to the BOP.
WRONG!
LOAD
SGND COM
EXT
REF
PROGRAMMING
DEVICE
ANALOG
I/O PORT
BOP 1KW
OUT OUT
I
EXT
REF
PROGRAMMING
DEVICE
ANALOG
I/O PORT
SGND COM
BOP 1KW
OUT OUT
I
LOAD
EXT
REF
PROGRAMMING
DEVICE
ANALOG
I/O PORT
OUT OUT
SGND COM
LOAD
BOP 1KW
I
3043801
CORRECT!