User Manual

12/06 AWB2724-1584GB
21
5 Installation
Connecting the power supply
Cable protection
Protect the supply cables with a miniature circuit-breaker or at
least a 1A (slow blow) fuse (F1).
Connecting digital inputs
Use input terminals I1 to I12 to connect pushbutton actuators,
switches or 3 or 4-wire proximity switches. Do not use any 2-wire
proximity switches due to the high residual current.
Connecting analog inputs
Inputs I7, I8, I11 and I12 can also be used to connect analog
voltages ranging from 0 V to 10 V.
The resolution is 10-bit = 0 … 1023.
X Use shielded twisted pair cables to prevent interference with
the analog signals.
X With short cable lengths, ground the shield at both ends using
a large contact area. If the cable length is more than around 30
m, grounding at both ends can result in equalisation currents
between the two grounding points and thus in the interference
of analog signals. In this case, only ground the cable at one end.
X Do not lay signal lines parallel to power cables.
X Connect inductive loads that you are switching via the outputs
to a separate power supply or use a suppressor circuit for
motors and valves. If the controller is run with motors, solenoid
valves or contactors via the same power supply, the switching
may cause interference on the analog input signals.
The following circuits contain examples of applications for analog
value processing.
Figure: 14: Connecting the power supply
The two 0 V terminals are connected internally!
h
Die EC4-200 is protected against polarity reversal.
h
The necessary connection data is provided chapter
“Technical data”, page 102.
h
The controller behaves like a capacitor the first time it is
powered up. The switching device and the supply device
for switching on the power supply must be designed for
this, i.e. no Reed relay contacts, no proximity switches.
...V
0 V0 V
L01 –
F1
L01 +
DC : +24 V
I1
I3I2
I4
I6I5
I7
...
Figure: 15: Connecting digital inputs
i
Caution! Observe the following when laying and
connecting analog cables:
h
Ensure that the reference potential is galvanically
connected. Connect the 0 V of the power supply unit for
the setpoint potentiometer and various sensors shown in
the examples with the 0 V of the power supply.
L01⫹
L01⫺
0 V l1 I2 I7
...V
F1
0 V
l3 I4
l5 I6
...