BENSHAW RediStart MX3 Series, User Manual

Page: 103 / 238

95
6 - PARAMETER DESCRIPTION
Description The Current Imbalance Trip 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 (PFN06) 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 (PFN06), the starter shuts down the motor and declares a Fault 37 (Current
Imbalance).
See Also Current Imbalance Trip Time (PFN06) on page 95.
Auto Reset parameter (PFN23) on page 102.
Controlled Fault Stop Enable parameter (PFN25) on page 103.
Current Imbalance Trip Time PFN 06
LCD Display
Range
0.1 – 90.0 seconds
(Default 10.0)
Description
The Current Imbalance Trip Time parameter sets the time that the current imbalance must be greater than the
percent imbalance parameter (PFN05) before a trip Fault 37 will occur.
See Also Current Imbalance Trip Level (PFN05) on page 94.
PFN: Cur Imbl Tim
06
10.0 sec
Alarm
Condition
Fault
Trip
% Imbalance
Current Imbalance
Trip Time
PFN 06
Current Imbl Lvl
PFN 05
Time