34 FXMP25 User Guide
www.controltechniques.com Issue Number: 3
Set the hysteresis from the level set in Pr 25 to eliminate relay bounce when the level is
reached. If the value is greater or equal to the threshold Pr 25 plus half the hysteresis
band Pr 26 the output becomes active, or if the value is less than the threshold minus
half the hysteresis the output becomes inactive.
When set to On (1) indicates the value of flux is above threshold levels set by Pr 25 and
Pr 26.
See Pr 30 for description.
When the motor is operating in the field weakening voltage loop region the relationship
between the field current and the level of flux can be non linear. The field controller can
include the effects of this non linearity by representing the field current to flux
characteristic as a series of three lines as shown in the figure overleaf.
26 FXMP25 OK hysteresis level
Coding
Bit FI Txt VM DP ND US RW BU PS
1111
Range 0.0 to 25.0 %
Default 0.0 %
Update rate 16 ms
27 Flux threshold level exceeded
Coding
Bit FI Txt VM DP ND US RW BU PS
11
Range OFF (0) or On (1)
Update rate 16 ms
29 Motor saturation breakpoint 1
Coding
Bit FI Txt VM DP ND US RW BU PS
111
Range 0 to 100 % of rated flux
Default 50
Update rate Background read
30 Motor saturation breakpoint 2
Coding
Bit FI Txt VM DP ND US RW BU PS
111
Range 0 to 100 % of rated flux
Default 75
Update rate Background read
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