• RS323 interface cable for configuration
COD. 1108200
Cable + Floppy
• ORDER CODE
N.B.: the PC configuration cable is supplied with the programming software.
WARNING: make the connection with the device powered and with inputs and
outputs disconnected.
7 • ACCESSORIES
K
s
numerator
K
s
=
K
s
denominator
M
U
= K
s
numerator
•
fs
d
E
= K
s
denominator
where:
fs = full scale [ KHz ] (can be chosen from 1, 2, 4, 10, 20, 40, 100KHz according to max. frequency in input)
M
U
= multiplier
d
E
= divisor
These parameters can be set on the “In” menu
EXAMPLE 1
D
pm
= 80 mm (motor pulley diameter)
D
pe
= 160 mm (encoder pulley diameter)
K
e
= 250 clock / rev = number of pulses per encoder rev
ω
m
maximum = 3000 rpm
Maximum frequency at input of the instrument must be determined to define full scale fs.
1 D
pm
f
max
=
• (
ω
m
maximum) •
•
Ke = 6250 Hz
60 D
pe
fs = 10 KHz (value of parameter P.S corresponding to a full scale of 10KHz is 11)
60
•
D
pe
60
•
160 12 K
s
numerator
K
s
= = = =
K
e
•
D
pm
250
•
80 25 K
s
denominator
After reducing the function to minimum terms, determine M
U
and d
E
(numerator and denominator):
P.S = 3, M
U
= 120, d
E
= 25
EXAMPLE 2
To show the rpms of a wheel with 250 pulses/rev, with max. frequency less than 1 kHz, set
FP = 0, P.S = 8 (full scale 1 KHz), M
U
= 6, d
E
= 25
EXAMPLE 3
For applications requiring greater precision of frequency value (with max. full scale 500 Hz), you can set a sampling time
greater than one second.
To show the frequency in pulses/second with fixed scale, with one decimal figure and with sampling time at a constant 5 sec,
set FP=3, tc =5.0 sec, P.S = 8 (full scale 1 KHz), M
U
= 1, d
E
= 5, d
P
= 1
EXAMPLE 4
Calculation of frequency displayed (F.v.) with a proximity input
With a full scale of 20KHz, the assigned prescaler ratio is 4; therefore the value shown is:
Input Frequency
Mu
es.: Ps = 12 (Fmax. 20KHz)
F.v. =
•
Prescaler Ratio = 4
Prescaler Ratio
dE
Mu = 3
dE = 7
Frequenza ingresso 3
F.v. =
•
= 214,2
4 7
Input Frequency
7
81671B_MHW_40F96_0308_ENG