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Diagnostics Optimization CT MODBUS RTU Technical Data
404 E300 Design Guide
Issue Number: 1
The bits in Trip Reset Source (L71) correspond to each of the trips in the trip log (i.e. bit 0 corresponds to trip 0, bit 1 corresponds to trip 1, etc.). When
a trip occurs, bit 0 is set to one and the other bits corresponding to the trips already in the trip log are shifted left one bit. If the trip is reset then bit 0 is
set back to zero, otherwise if a higher priority trip occurs bit 0 is shifted left by one bit. The result is that each of the bits in Trip Reset Source (L71)
show whether trips in the trip log were reset or moved up the trip log by a higher priority trip.
When a trip occurs the time in milliseconds since the drive powered up is stored in Trip Time Identifier (L72). The time rolls-over when it reaches 231
- 1, but if the time is 0 a value of 1 is written. Trip Time Identifier (L72) can be used to determine when a new trip has occurred as the value will change
(unless there were exactly 232 ms between trips) and will be non-zero.
The bits in Potential Drive Damage Conditions (L73) are set under the conditions shown in the table below to indicate that the user has put the drive
in a condition that could potentially damage the drive. The bits in this parameter cannot be cleared by users.
The bits in Status Word (L74) mirror the status bit parameters as shown below. Where the parameters do not exist in any mode the bit remains at
zero.
L71 Trip Reset Source
Mode Open-Loop, RFC-A, RFC-S
Minimum 0 Maximum 1023
Default Units
Type 16 Bit Power Down Save Update Rate Write on trip
Display Format Standard Decimal Places 0
Coding RO, ND, NC, PT, BU
L72 Trip Time Identifier
Mode Open-Loop, RFC-A, RFC-S
Minimum -2147483648 Maximum 2147483647
Default Units ms
Type 32 Bit Volatile Update Rate Write on trip
Display Format Standard Decimal Places 0
Coding RO, ND, NC, PT
L73 Potential Drive Damage Conditions
Mode Open-Loop, RFC-A, RFC-S
Minimum
0
(Display: 0000)
Maximum
15
(Display: 1111)
Default Units
Type 8 Bit Power Down Save Update Rate background write
Display Format Binary Decimal Places 0
Coding RO, ND, NC, PT, BU
Potential Drive Damage
Conditions (L73) bit
Condition
1 Low Under Voltage Threshold (O14) has been reduced from its default value.
2 High speed RFC-S mode has been used. See Enable High Speed Mode (B28).
3 Not used.
L74 Status Word
Mode Open-Loop, RFC-A, RFC-S
Minimum
0
(Display: 000000000000000)
Maximum
32767
(Display: 111111111111111)
Default Units
Type 16 Bit Volatile Update Rate Background Write
Display Format Binary Decimal Places 0
Coding RO, ND, NC, PT
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