GE 339 Instruction Manual page 127

CHAPTER 4: ACTUAL VALUES
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
LEARNED START CURR
Range: 0.0 to 10000.0 A in steps of 0.1 A
The learned starting current is the Learned Starting Current measured at the time the
record was saved. Starting current is measured 200 ms after the transition of motor
status from stopped to starting, which should ensure that the measured current is
symmetrical. 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 Learned Thermal Capacity Used at the time the
record was saved. Start thermal capacity used is the amount of thermal capacity used
during starting. A successful motor start is 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 may be used to manually fine-tune
the thermal start inhibit margin. See the Start Inhibit section of this manual for a
description of how the learned start thermal capacity used is calculated.
LAST ACCEL TIME
Range: 0.0 to 250.0 s in steps of 0.1 s
The last acceleration time is the Last Acceleration Time measured at the time the record
was saved.
LAST START CURR
Range: 0.0 to 10000.0 A in steps of 0.1 A
The last starting current is the Last Starting Current measured at the time the record was
saved.
LAST START TCU
Range: 0 to 100% in steps of 1
The last start thermal capacity used is the Last Thermal Capacity Used at the time the
record was saved.
LEARNED AVG 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,
experienced over the last 15 running minutes. Samples are taken once a second. In the
case of two-speed 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.
AVG RUN TIME
Range: Hours, Minutes
The average Run Time of the last five starts at the time the record was saved.
RTD 1 to 12 MAX TEMPERATURE
Range: -50 to 250°C
The maximum temperature experienced by each of the RTDs.
Once a second each of the RTD temperature values is captured. For each RTD, if the
captured RTD temperature value is greater than the RDT maximum temperature already
stored, the RDT maximum temperature is set to this latest captured RTD temperature
value. The RTD maximum temperature values are maintained in non-volatile memory to
carry over a relay power interruption.
A3 RECORDS
4–19