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5. Sample applications
5.1. Measurement of motor currents
By using MCR-S modules in one or more input phases of the motor, so-called motor monitoring can be
carried out (Fig.8).
The MCR current measuring transducer can pass on corresponding standard signals about motor load to
the controller or service personnel.
The true r.m.s. measurement means that AC, DC and distorted currents can be measured. Even higher
frequency currents up to 400 Hz can be measured.
Frequency converter
L1
N
5.2. Recording motor current peak loads
Large industrial motors have to be overhauled and serviced at regular intervals.
Installing an MCR current transducer in one phase of the motor feed line allows impulses to be generated
with the relay or transistor switching output that can be measured with the aid of a simple meter (Fig.9).
The service personnel can provide efficient maintenance on the basis of the motor starts and peak loads
corresponding to the number of overloads.
L1
N
5.3. Monitoring lighting
MCR current transducers can be used for monitoring lighting.
If the strength of the current in circuit is exceeded or fallen below after a suppressed turn-on time, there is
a defect in the lighting circuit. If the lighting circuit fails, this signal status can be passed on to another
control unit and the emergency lighting can be switched on. The same procedure can also be used with
other consumers.
Relais
MCR-S-...
5
1
10 A
12
TIME
6
2
5 A
11
0
7
3
1 A
14
8
4
NC
OUT
Relais
MCR-S-...
5
1
10 A
12
TIME
6
2
5 A
11
0
7
3
1 A
14
8
4
NC
OUT
OUT
POWER
9
⁄
I
+ 24V
0
$
U
GND 1
sec
30
!
%
GND 2
SW
"
&
GND 2
GND 1
Mains voltage
Maintenance Interval meter
OUT
POWER
9
⁄
I
+ 24V
0
$
U
GND 1
sec
30
!
%
GND 2
SW
"
&
GND 2
GND 1
Mains voltage
Control
24V
0
1
2
3
24V
Fig.9
Fig.8
25
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