Technical information

5 – PARAMETER DESCRIPTIONS
61
P28 Current Imbalance Level PFN 05
LCD Display
PFN:Cur Imbl Lvl
05 15%
Range OFF, 5 – 40 % (Default 15%)
Description The Current Imbalance Level parameter sets the imbalance that is allowed before the starter shuts
down. The current imbalance must exist for 10 seconds before a fault occurs.
At average currents less than or equal to full load current (FLA), the current imbalance for each phase
is calculated as the percentage difference between the phase current that has the maximum deviation
from the average current (Imax) and the FLA current.
The equation for the current imbalance if running at current <=FLA:
100% x
FLA
)max I - ave (I
imbalance % =
At average currents greater than full load current (FLA), the current imbalance for each phase is
calculated as the percentage difference between the phase current that has the maximum deviation
from the average current (Imax) and the average current (Iave).
The equation for the current imbalance if running at current > FLA:
100% x
ave I
)max I - ave (I
imbalance % =
If the highest calculated current imbalance is greater than the current imbalance level for 10 seconds,
the starter shuts down the motor and declares a Fault 37 (Current Imbalance).
See Also Auto Reset parameter on page 64
Controlled Fault Stop Enable parameter on page 64
Alarm
Condition
Fault
Trip
% Imbalance
Delay
(Fixed 10 Seconds)
Current Imbl Lvl
PFN 05/P28
Time