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CHAPTER 7: RECORDS
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
LEARNED ACCELERATION TIME
Range: 0.000 to 250.000 s in steps of 0.001 s
The learned acceleration time is the longest acceleration time measured over the last N
successful starts, where N is defined by the setting in SETPOINTS > SYSTEM > MOTOR >
NUMBER OF STARTS TO LEARN. Acceleration time is the amount of time the motor takes
to reach the running state from stopped. A successful motor start is one in which the
motor reaches the running state.
If acceleration time is relatively consistent, the learned acceleration time plus suitable
margin can be used to manually fine-tune the acceleration protection setting. The
learned acceleration time must not be used until several successful motor starts have
been measured.
LEARNED STARTING CURRENT
Range: 0.00 to 20.00 x FLA in steps of 0.01 x FLA
The learned starting current is the average starting current measured over the last N
successful starts, where N is defined by the setting in SETPOINTS > SYSTEM > MOTOR >
NUMBER OF STARTS TO LEARN. The effective current is used as starting current as
defined in the element of Acceleration Time. A successful motor start is one in which the
motor reaches the running state.
LEARNED START TCU
Range: 0 to 100% in steps of 1%
The Learned Start Thermal Capacity is the largest Start Thermal Capacity Used value
calculated by the thermal model over the last N successful, where N is defined by the
setting in SETPOINTS > SYSTEM > MOTOR > NUMBER OF STARTS TO LEARN. The Start
Thermal Capacity Used is the amount of thermal capacity used during starting. A
successful motor start is the one in which the motor reaches the running state. If the
thermal capacity used during starting is relatively consistent, the Learned Start Thermal
Capacity Used value plus suitable margin can be used to manually fine-tune the thermal
start inhibit margin. See the Start Supervision section of the 869 Instruction manual,this
manual, for a description of how the Learned Start Thermal Capacity Used is calculated.
The Learned Start Thermal Capacity Used value must not be used until at least N
successful motor starts have occurred.
LAST ACCELERATION TIME
Range: 0.000 to 250.000 s in steps of 0.001 s
The last acceleration time is measured after a successful motor start.
LAST STARTING CURRENT
Range: 0.00 to 20.00 x FLA in steps of 0.01 x FLA
The last starting current is measured after a successful motor start.
LAST START TCU
Range: 0 to 100% in steps of 1%
The last start thermal capacity used is measured after a successful motor start.
LEARNED AVERAGE LOAD
Range: 0.00 to 20.00 x FLA in steps of 0.01 x FLA
Learned average load is the average motor current, expressed as a multiple of FLA over
a period of time, when the motor status is Running. The period of data window is tAVER,
specified in SETPOINTS > SYSTEM > MOTOR > LOAD AVERAGE CALC. PERIOD. If the run
time of a start/stop sequence is less than t
available samples. The calculation is ignored during motor starting. The data will be
updated every t
minutes once the motor status is Running. In the case of two-speed
AVER
motors with different FLA values for the two speeds, the FLA used for each current
sample is the one in effect at the time that sample was taken.
, the Learned Average Load averages all
AVER
LEARNED DATA
7–5
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