Appendix D—Modbus Register Map
352 Power Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.com
920 PT Ratio Primary UINT16 RW NV
Default: 1
Run Lock
PT Ratio - Primary (Only used with external Potential Transformers)
921 PT Ratio Secondary UINT16 RW NV
Default: 1
Run Lock
PT Ratio - Secondary (Only used with external Potential Transformers)
922 CT Ratio - Primary
External Ground Current CT
UINT16 RW NV
Default: 500
Range: 1 to 65535
Units: A
Config CRC
Run Lock
Admin Lock
USB Lock
Backup Mem
CT Ratio - Primary
CBCT ratio is adjusted by changing the CT Primary Current Input vs CT
Secondary Output Ratings
923 CT Ratio - Secondary
External Ground Current CT
UINT16 RW NV
Default: 1
Range: 1 to 65535
Units: A
Config CRC
Run Lock
Admin Lock
USB Lock
Backup Mem
CT Ratio - Secondary
CBCT ratio is adjusted by changing the CT Primary Current Input vs CT
Secondary Output Ratings
924 CT Secondary Multiplier
External Ground Current CT
UINT16 RW NV
Default: 1
Range: 1 to 65535
Config CRC
Run Lock
Admin Lock
USB Lock
Backup Mem
GFM CBCT CT Ratio Interposing Multiplier
Multiplier allows support for configurations where effective CT ratio is
very high. When using an interposing CT this register would contain the
interposing CT ratio.
1000 Trip Enable BYTE RW NV
Array size: 4
Default: 0x38, 0x00, 0x04,
0x00
Bitfield
Config CRC
Run Lock
Admin Lock
USB Lock
Backup Mem
Enable protections by selecting the box next to each protection to place a
check mark in it. Each protection selected will enable those protections
that the C445 will trip on.
Table 128. C445 Modbus Register Map, continued
Register Name Attribute Description
Bit Description Coil
0 Under voltage 15985
1 Over voltage 15986
2 Reserved 15987
3 Ground current fault 15988
4 Current phase loss 15989
5 Current unbalance 15990
6 Instantaneous over current 15991
7 Jam 15992
8 Power factor deviation 15993
9 Voltage phase loss 15994
10 Voltage unbalance 15995
11 Frequency deviation fast 15996
12 Frequency deviation slow 15997
13 Under current 15998
14 High power 15999
15 Low power 16000
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