BENSHAW RediStart EXEXMVRMX3 Series, User Manual

Page: 88 / 222

78
6 - PARAMETER DESCRIPTION
Current Imbalance Trip Level PFN 05
LCD Display
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 the Current Imbalance Delay Trip Time (PFN 06) before a fault occurs.
At average currents less than or equal to full load current (FLA), the current imbalance 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:
%
( )
% imbalance
Iave I
FLA
=
-
´
max
100
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:
%
( )
% imbalance
Iave ax
Iave
=
-
´
Im
100
If the highest calculated current imbalance is greater than the current imbalance level for the Current
Imbalance Delay Trip Time (PFN 06), the starter shuts down the motor and declares a Fault 37 (Current
Imbalance).
See Also Current Imbalance Trip Time (PFN 06) on page 78.
Auto Reset parameter (PFN 23) on page 84.
Controlled Fault Stop Enable parameter (PFN 25) on page 85.
Current Imbalance Trip Time PFN 06
LCD Display
Range
0.1 – 90.0 seconds
(Default: 10.0 sec)
PFN: Cur Imbl Lvl
05
15 %
Alarm
Condition
Fault
Trip
% Imbalance
Current Imbalance
Trip Time
PFN 06
Current Imbl Lvl
PFN 05
Time
PFN: Cur Imbl Tim
06
10.0 sec