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6.3.1. Selecting the appropriate measuring transducer
How to select the appropriate measuring transducer can be found in "2. Versions" or
"8. Order Key". The measured value must always be borne in mind:
0...0.2 A to 0...11 A (MCR-S-1-5-...) or 0...9.5 A to 0...55 A (MCR-S-10-50-...).
If in doubt, always choose the largest possible measuring range.
There is also one version with relay and transistor output for each module type
(MCR-S-...-SW-DCI).
6.3.2. Configuring or programming
The advantage of the MCR-S-...-DCI generation is that one has the choice between
configuring and programming. Using the MCR-PI-CONF-WIN software, the user has the
possibility of freely programming the true r.m.s. value current transducer.
Programming is described in the software manual. The convenient configuration software
runs under all common windows operating systems.
In addition to the programming, modules can be parameterized using DIP switches and
potentiometers.
In the rest of this chapter, the configuration is explained:
6.3.3. Opening the device
Using a screwdriver, the snap lock of the
upper part of the housing is unlocked on both
sides. The upper part of the housing and the
electronics can now be pulled out by approx.
3 cm.
DIP Function of the DIP switches
10
Configuration via DIP switch / Programming via software
9
Input current measurement: true r.m.s. value /
8
Operating/quiescent current behaviour (only threshold value version)
7
Threshold value exceeded / Threshold value fallen below (only
threshold value version)
6
Setting the analog output signal
5
4
3
2
Setting the input measuring range
1
Setting DIP switch 10 to configuration mode (DIP switch 10 to "OFF" ) switches all
potentiometers to "active".
Configuration via:
DIP switch
Software (Any DIP switch (1-9) and potentiometer setting)
24
6.3.5. Configuring the analog output
Output
DIP 3
DIP 4
0...20 mA
OFF
OFF
20... 0 mA
OFF
OFF
4...20 mA
OFF
OFF
20... 4 mA
OFF
OFF
0...10 V
OFF
ON
10... 0 V
OFF
ON
0... 5 V
OFF
ON
5... 0 V
OFF
ON
1... 5 V
ON
OFF
5... 1 V
ON
OFF
-10... 10 V
ON
ON
10...-10 V
ON
ON
-5... 5 V
ON
ON
5... -5 V
ON
ON
6.3.6. Configuring the threshold value output
The relay and transistor output of the threshold value versions (MCR-S-...-SW-DCI) are
set after the input measuring range and the analog output have been adjusted.
Setting the switching threshold:
The illustration opposite (Fig. 4, p. 27) shows the four possibilities of switching behavior
of the relay and transistor output. The splitting of the various operational behaviors in
threshold value operation is carried out on the principle of operating current or quiescent
current and after threshold value triggering when below the threshold value point or when
it is exceeded.
If necessary, the corresponding switching behaviour can be set via DIP switch 7 and DIP
switch 8.
Functional
Switching behavior of relay and transistor output
diagram
Fig. 1
Operating current-controlled when threshold value is
exceeded
Fig. 2
Operating current-controlled when lower than
threshold value
Fig. 3
Quiescent current-controlled when threshold value is
exceeded
Fig. 4
Quiescent current-controlled when below threshold
value
26
C I
-D
I- S
W
0
6 5
-U
-1 -5
1 4
T
R -S
2 8
O U
I
M C
r. :
UT
.- N
9
O
U
A rt
C
0
O
UT
2
DA
D
2
!
GN
D
"
GN
C
C
24
VD
AD
µC
DA
C
§
1
U
D
$
GN
IN
%
SW
1
GA
Pow
er
&
GN
D
5
=
A
6
T
10
7
OF
FSE
5A
1A
8
T
POIN
SET
IN
E
TIM
1
2
12
11
3
4
14
NC
O U
T
A L
S
O V
P R
A P
/
Arithmetic average
DIP 5
DIP 6
OFF
OFF
OFF
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
ON
DIP 7
OFF
ON
OFF
ON
6.3.4. Configuring the input current range and measuring method
(Rough setting via DIP switch)
You have the choice: True r.m.s. value or arithmetic average!
The measuring principle must be preset with DIP switch 9:
Measuring principle
True r.m.s. value
Arithmetic average
True r.m.s. value: The true r.m.s. value of an AC current corresponds by definition to the
permanent value resulting from the momentary values of the current. This permanent
value generates the same heat in an ohmic resistor as a DC current of the same strength.
True r.m.s. value simply indicates that distorted and pulsating currents are also measured.
Arithmetic average: The arithmetic average serves to measure DC currents or filter a DC
portion from a pulsating current. Using the arithmetic average on a symmetrical AC
current would result in a measured value with the value "0".
The arithmetic average makes it possible to make bipolar DC currents available as analog
standard signals at the output.
MCR-S-1-5-...DCI: Ideal exploitation of the measuring ranges
Span potentiometer:
-25 %
1 A input: Measuring range: 0...0.2 A to 0...1.1 A
0...0.75 A
Fig. 2
0...0.48 A
0...0.30 A
0...0.18 A
5 A input: Measuring range: 0...0.94 A to 0...5.5 A
0...3.75 A
0...2.43 A
0...1.50 A
0...0.94 A
10 A input: Measuring range: 0...4.87 A to 0...11 A
0...7.50 A
0...4.87 A
MCR-S-10-50-...DCI: Ideal exploitation of the measuring range
Span potentiometer:
Fig. 3
-25 %
Measuring range: 0...9.5 A to 0...55 A
0...37.5 A
0...24.4 A
DIP 10
0...15.0 A
OFF
0...9.38 A
ON
* The nominal range has been adjusted!
1) Functional diagram:
Operating current-controlled when
threshold value is exceeded
I
IN
( H)
(1)
t
(0)
1
(0)
t
1
(1)
3) Functional diagram:
Quiescent current-controlled when
threshold value is exceeded
I
IN
( H)
(1)
t
1
(0)
(0)
t
1
(1)
(0) = = = = N/O contact and transistor open / N/C contact closed / LED off
(1) = = = = N/O contact and transistor closed / N/C contact open / LED on
t
can be set with software and potentiometer.
DIP 8
1
OFF
OFF
ON
ON
AC and DC without digit sign
DC with digit sign
Nominal range*:
Span potentiometer:
0 %
+ 25 %
0...1.00 A
0... 1.10 A
0...0.65 A
0... 0.81 A
0...0.40 A
0... 0.50 A
0...0.25 A
0... 0.31 A
0...5.00 A
0... 5.50 A
0...3.25 A
0... 4.06 A
0...2.00 A
0... 2.50 A
0...1.25 A
/
0...10.0 A
0... 11.00 A
0 ... 6.5 A
0 ... 8.12 A
Nominal range*:
Span potentiometer:
0 %
+ 25 %
0...50.0 A
0... 55.0 A
0...32.5 A
0... 40.6 A
0...20.0 A
0... 25.0 A
0...12.5 A
0... 15.6 A
2) Functional diagram:
Operating current-controlled when below
threshold value
I
IN
Threshold value
condition
t
( H)
Operating voltage
( L)
U
B
t
Relay N/O contact
(1)
t
and transistor
1
(0)
output / LED
t
(0)
t
t
Relay/N/C contact
1
(1)
4) Functional diagram:
Quiescent current-controlled when below
threshold value
I
IN
Threshold value
condition
t
( H)
Operating voltage
U
( L)
B
t
Relay N/O contact
(1)
and transistor
t
(0)
1
output / LED
t
(0)
t
t
Relay/N/C contact
1
(1)
DIP 9
OFF
ON
DIP 1
DIP 2
OFF
OFF
OFF
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
DIP 1
DIP 2
OFF
OFF
OFF
ON
ON
OFF
ON
ON
25
t
( L)
t
t
1
t
t
t
1
t
( L)
t
t
1
t
t
1
t
Fig. 4
27
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