GE LM10 Data Formats, F1 Full Load Current 16-bit unsigned integer, F2 Ground Fault, F3 Jam

CHAPTER 5: COMMUNICATIONS DEVICENET OPERATIONS

5.1.11 Data Formats

F1: Full Load Current (16-bit unsigned integer)

Range: 0x000C to 0x1F40 (i.e. 1.2 to 800.0 A)

Multiplying factor: 0.1

Example: 123.4 stored as 1234

F2: Ground Fault

Format: two bytes in format 0xHHLL, where LL is the pickup level and HH is the time delay

Byte LL range: 0x00, 0x02 to 0x64 (i.e. 0.4 to 20.0 A), where 0x00 is disabled

Byte LL multiplying factor: 0.2 (i.e. actual = byte LL in decimal ⋅ 0.2 amps)

Byte HH range: 0x00 to 0x19 (i.e. 0 to 2.5 seconds)

Byte HH multiplying factor: 0.1 (i.e. actual = byte HH in decimal ⋅ 0.1 seconds)

F3: Jam

Format: two bytes in format 0xHHLL, where LL is the pickup level and HH is the time delay

Byte LL range: 0x00, 0x64 to 0xFA (i.e. 100 to 250%), where 0x00 is disabled

Byte HH range: 0x00 to 0xC8 (i.e. 0 to 1000 seconds)

Byte HH multiplying factor: 5 (i.e. actual = byte HH in decimal ⋅ 5 seconds)

F4: Stall

Format: two bytes in format 0xHHLL, where LL is the pickup level and HH is the time delay

Byte LL range: 0x00, 0x42 to 0x78 (i.e. 330 to 600%), where 0x00 is disabled

Byte LL multiplying factor: 5 (i.e. actual = byte LL in decimal ⋅ 5%)

Byte HH range: 0x00 to 0x3C (i.e. 0 to 30.0 seconds)

Byte HH multiplying factor: 0.5 (i.e. actual = byte HH in decimal ⋅ 0.5 seconds)

F5: Current Unbalance

Format: two bytes in format 0xHHLL, where LL is the pickup level and HH is the time delay

Byte LL range: 0x00, 0x02 to 0x19 (i.e. 2 to 25%), where 0x00 is disabled

Byte HH range: 0x00 to 0xFF (i.e. 0 to 255 seconds)

F6: Load Loss

Format: two bytes in format 0xHHLL, where LL is the pickup level and HH is the time delay

Byte LL range: 0x00, 0x0F to 0x64 (i.e. 15 to 100%), where 0x00 is disabled

Byte HH range: 0x00 to 0xFF (i.e. 0 to 255 seconds)

F7: Power Transformer

Format: two bytes in format 0xHHLL, where LL is the PT ratio and HH is reserved

Byte LL enumeration:

Value	PT Ratio
0	200:120
1	240:120
2	480:120
3	600:120
4	2400:120
5	3000:120

Value PT Ratio

63300:120

74200:120

84800:120

95400:120

106000:120

117200:120

F8: Current Transformer

Format: two bytes in format 0xHHLL, where LL is the CT ratio and HH is reserved Byte LL enumeration:

Value	CT Ratio
1	27 A sensor pack

Value	CT Ratio
9	250:5

LM10 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 5–57