Lenze EVF9383 - Manual (Page 223)

Configuration
Function blocks
Master frequency input (DFIN)
8
8.2
8.2.2
l
8.2−7 EDSVF9383V EN 7.1−04/2012
In C0425 the output signal can be adapted:
ƒ To the encoder at X9 or
ƒ To the upstream controller with master frequency cascade/master
frequency bus.
Transfer function
Calculating the output signal:
DFIN−OUT [rpm]
+ f [Hz] @ 60
C0425
Example:
The input frequency amounts to 200 kHz, the number of increments
corresponds to 2048 inc/rev. (C0425 = 3).
DFIN−OUT [rpm]
+ 200000 Hz @ 60
2048 +
5859 rpm
Signal adaptation
Signal adaptations other than by squaring in C0425 can be achieved by
connecting a function block.
Example:
The function block CONV3 shall convert the speed signal into a quasi analog
signal.
Calculating the output signal at CONV3:
CONV3−OUT [%]
+ f [Hz] @ 0.4
C0425
@ C0950
C0951
Interconnecting function blocks:
CONV3
CONV3-OUT CONV3-IN
C0953
C0952
C0950
C0951
C0425
C0427
DFIN
DFIN-OUT
C0426
X9
fb_dfin_01
Fig. 8.2−6 Digital frequency input (DFIN) with connected converter
)
Note!
If a master frequency is output to DFOUT−AN−IN or DFOUT−DF
(C0540 = 0 or C0540 = 1) and an incremental encoder is
evaluated via X8, the function block DFIN cannot be used
anymore.
If the input signals at X8 or X9 are output to X10, (C0540 = 4 or
C0540 = 5), this restriction does not exist.
Adjusting the output signal