Learned Data - GE 339 Instruction Manual

A3 RECORDS

Learned data

NOTE:
NOTE
4–18
AN VOLTAGE
o
0 V 0 lag
BN VOLTAGE
o
0 V 0 lag
CN VOLTAGE
o
0 V 0 lag
AB VOLTAGE
o
0 V 0 lag
BC VOLTAGE
o
0 V 0 lag
CA VOLTAGE
o
0 V 0 lag
NTRL VOLTAGE
o
0 V 0 lag
AUX VOLTAGE
o
0 V 0 lag
FREQUENCY
60.00 Hz
The 339 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 turned off.
Clearing motor data (ACTUAL VALUES > A3 RECORDS > CLEAR LEARNED DATA) resets all
these values to their default settings.
Each of the learned features discussed below should not be used until at least five (5)
successful motor starts and stops have occurred.
LEARNED ACCEL TIME
Range: 0.0 to 250.0 s in steps of 0.1 s
The learned acceleration time is the Learned Acceleration Time measured at the time
the record was saved. 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 may be used to manually fine-tune the acceleration protection setting.
CHAPTER 4: ACTUAL VALUES
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL