SD34002g_e.doc / Sep-13
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4.6. Ratio of two Speeds: F02.004 = 5 or 6
Both inputs, encoder 1 and encoder 2, are active. The unit calculates the ratio of the two
speeds, with consideration of the individual scaling of each channel. The final result can once
more be scaled into user-friendly engineering units by means of the special scaling parameters
in parameter group F02 (conversion factor K = F02.09 : F02.08), see figure below*).
F02.004 = 5 calculates [encoder1] : [encoder2]
F02.004 = 6 calculates [encoder2] : [encoder1]
Besides the actual speeds and the ratio the unit also records minimum and maximum values of
the ratio.
Preset K1 is related to the absolute speed of encoder 1.
Preset K2 is related to the absolute speed of encoder 2.
Presets K3 and K4 are related to the ratio of both speeds
Display
L1 (red)
L2 (yellow)
1 Speed ratio [encoder
(1 or 2)
] : [encoder
(2 or 1)
] *)
statically ON
statically ON
2 Minimum ratio since last min/max reset
blinking slow
blinking slow
3 Maximum ratio since last min/max reset
blinking fast
blinking fast
4 Actual speed of encoder 1
statically ON
---
5 Actual speed of encoder 2
---
statically ON
Encoder 1
1 2 3 4 5 6
Cont.1
Cont.4
Encoder 2
Remote control functions
d
Roll diameter
f
1
f
2
d = K x
f
2
f
1
Example: Calculation of the roll diameter "d" from the ratio of infeed speed and roll rpm
*) The unit presents the ratio of the two speeds as an integer number only, e.g. if both speeds are equal,
the unit would just display "1". To display a ratio with decimal positions like 1.0 or 1.00 or 1.000 etc. it
is necessary to follow one of these hints:
a. scale the speed used as numerator by a factor of 10 or 100 or 1000 higher than the denominator, or
b. set parameters F02.009 (multiplier) and F02.008 (divider) with a ratio of 10, 100 or 1000
