Learned Data - GE 869 Instruction Manual

LEARNED DATA

Learned Data
NOTE:
7–4
The 869 measures and records individual data records, as indicated below, all from actual
motor operation. The latest individual data record "set" can be viewed using the Learned
Data feature on the relay. The data, when input cumulatively to the Learned Data Recorder
(see below) can be used to evaluate changes/trends over time. Note that learned values
are calculated even when features requiring them are disabled.
The Learned Data recorder measures and records up to 250 data record "sets," all from
actual motor operation. The data can be used to evaluate changes/trends over time. All
available stored motor learned data records can only be retrieved using EnerVista 8 Series
Setup program from Records > Learned Data Records menu
Clearing learned data (RECORDS > CLEAR RECORDS > LEARNED DATA) resets all these
values to their minimum values and clears the stored file. The date and time is recorded
when clearing. An event 'Clear Learned Rec' is sent to the Event Record. The next record is
be captured after N successful starts.
Each of the learned features discussed below must not be used until at least N successful
motor starts and stops have occurred, where N is defined by the setting in SETPOINTS >
SYSTEM > MOTOR > NUMBER OF STARTS TO LEARN.
The last stored Motor Learned Data records can be viewed from the following menu.
Path: Records > Learned Data
RECORDS SINCE CLEAR
This value shows the number of records since the last clearance.
LAST CLEAR DATE/TIME
Range: MM/DD/YY HH:MM:SS
This value is the date and time on which the record was cleared.
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
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: RECORDS