5. ACTUAL VALUES
A3 LEARNED DATA
5-15
5.4.1
MOTOR STARTING
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DESCRIPTION:
The SR469 learns the acceleration time, the starting current, as well as, the thermal capacity required during motor starts. This data is
accumulated based on the last five starts. The SR469 also keeps statistics for last acceleration time, last starting current, and last start-
ing capacity. This information can be reset to default using the setpoint in S1 SR469 SETUP under INSTALLATION.
If motor load during starting is relatively consistent, the learned acceleration time may be used to fine tune the acceleration protection.
Learned acceleration time will be the longest time of the last five successful starts. The time is measured from the transition of motor
current from zero to greater than Overload Pickup, until line current falls below the Overload Pickup level.
Learned Starting Current is measured 200ms after the transition of motor current from zero to greater than Overload Pickup. This should
ensure that the measured current is symmetrical. The value displayed is the average of the last 5 successful starts. NOTE: If there are
less than 5 starts, 0’s will be averaged in for the full 5 starts.
The learned starting capacity is used by the SR469 to determine if there is enough thermal capacity to permit a start. The largest value
of thermal capacity used from the last five successful starts is multiplied by 1.25 and stored as thermal capacity used on start. This 25%
margin is used to ensure that a motor start will be successful. If the number is greater than 100% , 100% is stored as thermal capacity
used on start. If there is not enough thermal capacity for a start, a start inhibit will be issued. Starting will be blocked until there is suffi-
cient thermal capacity.
EXAMPLE:
If the thermal capacity used for the last 5 starts is 24, 23,
27, 25, and 21% respectively, learned starting capacity is
27% x 1.25= 33.75% used. If the motor stops with 90%
thermal capacity used, a start block will be issued.
When the motor has cooled and the level of thermal ca-
pacity used has fallen to 66%, a start will be permitted.
5.4.2
AVERAGE MOTOR LOAD
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DESCRIPTION:
The SR469 can learn the average motor load over a period of time. This time is specified by the setpoint in the preferences section of
S1 SR469 SETUP (default 15 minutes). The calculation is a sliding window and is ignored during motor starting.
5.4 A3 LEARNED DATA
Summary of Contents for SR469
Page 7: ......
Page 19: ...2 INSTALLATION MECHANICAL 2 5 2 1 5 TERMINAL LOCATIONS Figure 2 11 TERMINAL LAYOUT...
Page 21: ...2 INSTALLATION ELECTRICAL 2 7 Figure 2 12 TYPICAL WIRING DIAGRAM...
Page 32: ...ELECTRICAL 2 INSTALLATION 2 18 2 2 14 TYPICAL 2 SPEED MOTOR WIRING...
Page 39: ...OVERVIEW 3 SR469 OPERATION 3 6 yy SETPOINTS yy S1 SR469 SETUP...
Page 104: ...4 SETPOINT PROGRAMMING S11 MONITORING 4 65 Figure 4 24 TRIP COIL SUPERVISION...
Page 113: ...S12 ANALOG I O 4 SETPOINT PROGRAMMING 4 74...
Page 244: ...8 469PC PROGRAM WAVEFORM CAPTURE 8 13 Figure 8 11 WAVEFORM CAPTURE...