Block Diagram; Description; Operation With Disturbed Frequency Input Signals; Measures To Counter External Influences - Phoenix Contact MCR-f-UI-DC Manual De Usuario

Universal Frequency Transducer MCR-f-UI-DC
Membrane keypad
Signal inputs

1. Block diagram

1
+8,2V
2
Namur
IN
IN
3
f in
4
GND 1
5
NPN
NPN
PNP
6
PNP
Dry
Contact +15V
A
7
U in
D
0-10 V
A
8
I in
D
0-20 mA
20

5. Connection Technology

2-wire DC (mechanical contact)
bn
+8,2 V
NAMUR
bu
IN
f IN
GND1
NPN
PNP
+15 V
U IN
I IN
Alternatively, terminal 1 is also possible
instead of terminal 6.
3-wire DC with:
PNP transistor output
bn
+8,2 V
NAMUR
bu
IN
bk f IN
pnp
GND1
NPN
PNP
+15 V
U IN
I IN
PNP transistor with pull-down
resistor
bn
+15 V
bk
bu
GND1
4-wire DC with:
PNP transistor output
bn
+8,2 V
NAMUR
bu
IN
bk f IN
pnp
wh
GND1
NPN
PNP
+15 V
U IN
I IN
22
ENGLISH
Supply
Switching output
Signal outputs
C 5
I - D 6 0
f - U 1 4
R -
2 8 4 V
+ 2
M C . : 9
N r
D
G N
t . - 0
A r
D C
D C
S W
D C !
D
G N
"
N C
§
U T
V
,2 I O
+ 8 $
u r
1
N a m
µ C
U T
2 I N
O
f in % U 2
3 D D
A G N
1 &
4 D
G N
D
N P N
A
5 P
P N
S
6 5 V
+ 1 A L
N A
N P D
P
P N O V
c t
D ry in P R
n ta U
C o 7 A
A P
D
/
0 V
I in
0 -1
8
N
N E
A I O
0 m
0 -2 A T
O B
P R
A P
E
R I
S E
9
DC +24 V
0
DC
DC
GND
!
SW
"
µC
GND
§
NC
$
D
I O UT
A
%
D U O UT
&
A
GND 2
2-wire DC NAMUR sensor
bn
+8,2 V
NAMUR
bu
IN
f IN
GND1
NPN
PNP
+15 V
U IN
I IN
NPN transistor output
bu
+8,2 V
NAMUR
bn
IN
bk f IN
npn
GND1
NPN
PNP
+15 V
U IN
I IN
NPN transistor with pull-up
resistor
bn
+15 V
bk
bu
GND1
NPN transistor output
bu
+8,2 V
NAMUR
bn
IN
bk f IN
npn
wh
GND1
NPN
PNP
+15 V
U IN
I IN

2. Description

MCR-f-UI-DC, the programmable MCR frequency transducer, is a module for displaying
and converting frequencies up to120 kHz. On the input side, all common frequency ge-
nerator signals in 2, 3 and 4-wire technology, and signals from incremental encoders can
be collected.
The input impulses are evaluated using period measurement and are then output by a
processor as an analog voltage or current value to match the measuring range start and
end value entered.
In order to achieve as short as possible reaction times, the inputs of the frequency
transducer have purposely been designed without a frequency input filter. An automatic
measurement range selection function (autorange) ensures that the measured value is
always displayed with the optimum resolution. Frequency interferences can, however,
lead to too large a division factor being selected for low input frequencies. This in turn can
result in an erratic output signal (see point 3: Operation with disturbed frequency input
signals).
In order to stabilize fluctuating input values, a filter function has been implemented for
conversion into the analog output value. The depth of this filter can be set from 1 to 15
using the membrane keyboard. The optimum filter depth depends on the application.
In addition to the analog output, there is also a PNP transistor switching output with a
maximum carrying capacity of 100 mA, for monitoring functions, for example (not short-
circuit proof).
Specially for rotational speed measurement, it is possible to both enter the measuring ran-
ge start and end value in revolutions per minute (RPM), and to observe the revolutions in
RPM on the LCD (4-pos. + RPM as unit) during operation.

3. Operation with disturbed frequency input signals

Fig. 1
3.1. Measures to counter external influences
• Use shielded conductors.
• Lay cables in an appropriate manner (EMC-compliant)
• Connect terminal 4 (GND 1) along the most direct route to PE.
3.2. If signal level > 20 V
• Unplug the jumper located in the module after opening the side flap. The jumper can be
parked temporarily on one of the three free pins.
• Now route the frequency input signal to the module via terminal 2. The signal is returned
via terminal 4 (GND 1).
• No additional settings are necessary.
3.3. If signal level > 10 V
• Connect the bottom two pins of the pin strip with the jumper.
• Now route the frequency input signal to the module via terminal 2.
The signal is returned via terminal 4 (GND 1).
• No additional settings are necessary.

4. Resetting to delivery state

• Connect the top two pins of the pin strip (nearest display) with the jumper.
• Terminal 2 is now ready again for the connection of NAMUR sensors.
Connection Technology (continuation)
Incremental encoder with push-pull:
• External supply of signal generator
U = 5-30 V DC
B
U = 0 V DC
B
Incremental encoder with HTL logic:
• External supply of signal generator
U = 24 V DC
B
K1, K2, K0
K1, K2, K0
U = 0 V
B
U input (direct current voltage)
-
+
• Supply of signal generator from the
module
15 V/25 mA
+8,2 V
NAMUR
IN
f IN
GND1
NPN
PNP
+15 V
U IN
I IN
The external supply can also be picked off
from terminals 9 +24VDC and 0 GND.
3-way isolation is then no longer provided.
The connection from terminal block 4
GND1 to terminal block 0 GND is
essential!
• Supply of signal generator from the
module
+8,2 V 15 V/25 mA
NAMUR
IN
f IN
GND1
K1, K2, K0
NPN
PNP
K1, K2, K0
+15 V
U IN
I IN
I input (direct current)
+8,2 V
NAMUR
IN
f IN
GND1
NPN
-
PNP
+15 V
+
U IN
I IN
21
+8,2 V
NAMUR
IN
f IN
GND1
NPN
PNP
+15 V
U IN
I IN
+8,2 V
NAMUR
IN
f IN
GND1
NPN
PNP
+15 V
U IN
I IN
+8,2 V
NAMUR
IN
f IN
GND1
NPN
PNP
+15 V
U IN
I IN
23