Littlefuse MP8000, Programming Manual

Page: 10 / 16

MP8000 Programming Guide
8
Fault Record Retrieval
There are two methods of requesting a fault record: By index, and by date. (See Table 6)
To request fault records by Index:
1. Write the fault index to the FRI register (0x300). Note, this index is zero based, so the most recent fault
record will have an index of zero.
a. Also the maximum valid index is 1023
2. Write to the CMD register (0x0076) with command 0x11 (see Table 4)
3. Continuously read the FRI register until it has been updated to 0xFFFF
4. The fault record is ready to read, starting at address 0x0308. (see Table 6)
To request fault records by date:
1. Write zero to the FRI register (0x0300).
2. Write the UNIX (32bit) time stamp to the FRO register (0x0304).
a. The log entry with the next earlier time entry will be retrieved.
3. Write to the CMD register (0x0076) with command 0x11 (see Table 4)
4. Continuously read the FRI register until it has been updated to 0xFFFF
5. The fault record is ready to read, starting at address 0x0308. (see Table 6)
Table 6 - Fault Record Retrieval
FIELD
NAME
MODBUS REGISTER
DESCRIPTION FORMAT PERMISSION
ADDRESS HEX
ADDRESS
DECIMAL
SIZE
FRI 0x0300 768 2 Fault Request Index (Or base DT) C W
FRO 0x0302 770 2 Fault Request Offset F W
FCODE 0x0304 772
2
Fault Code indicating the source of the fault B R
FDT 0x0306 774 2 Date Time of Fault K R
V1F 0x0308 776 2 Measured line 1 Voltage RMS H R
V2F 0x030A 58 2 Measured line 2 Voltage RMS H R
V3F 0x030C 780 2 Measured line 3 Voltage RMS H R
I1F 0x030E 782 2 Measured line 1 Current RMS H R
I2F 0x0310 784 2 Measured line 2 Current RMS H R
I3F 0x0312 786 2 Measured line 3 Current RMS H R
MRTF 0x0314 788 2 Time since motor started H R
TCUF 0x0316 790 2 Thermal Capacity Used L R
P1F 0x0318 792 2 Measured line 1 Power C R
P2F 0x031A 794 2 Measured line 2 Power C R
P3F 0x031C 796 2 Measured line 3 Power C R
PF1F 0x031E 798 1 Measured line 1 Power Factor P R
PF2F 0x031F 799 1 Measured line 2 Power Factor P R
PF3F 0x0320 800 1 Measured line 3 Power Factor P R
IGFF 0x0321 801 2 Ground Fault Current H R
VUBF 0x0323 803 1 Measured Voltage Unbalance G R
CUBF 0x0324 804 1 Measured Current Unbalance G R
FAF 0x0325 805 1 Frequency Measured from Phase A G R
SEQF 0x0326 806 1 Measured Phase Sequence G R
FSDF 0x0327 807 5 Fault Specific Data N.A R
© 2018 Littelfuse Protection Relays & Controls www.littelfuse.com/mp8000