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
1
1
1
1
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
1
1
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
1
1
1
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
1
1
1
Range
0 to 100 % of rated flux
Default
75
Update rate
Background read
