Dynalco SWT-2000 Speed Switch/Speed Transmitter - Manual (Page 22)

Operating Instructions SWT-2000 DYNALCO
18
6.7.7 Math Function
Go to , .
Math function is an additional input available for System Limit.
The following Math functions may be constructed.
S1 – S2
S2 – S1
Subtraction of speed values
S1 / S2
S2 / S1
Division of speed values
100% x (S1-S2)/S2
100% x (S2-S1)/S1
Percentage difference
Variance (S1)
Variance (S2)
Variance
Acceleration (S1)
Acceleration (S2)
Speed value acceleration
S1
S2
The speed values are fed through
e.g. for the Math function.
Percentage difference
1
) 1 2 ( 100
n
n n
− ×
n: Speed
Variance
2
1
2 ) (
1
1 ∑
=
−
−
=
j
i
i x
x x
j
S j = 100
Acceleration
alt FlankeS FlankeS
alt
t t
n
t
v
a
1 1
1 1
−
−
=
Δ
Δ
=
n: Speed
If the variance for S1, S2 or Analog input needs to be calculated, the measurement time must be set to 5ms
or higher.