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6.4 Control inputs
Analog
control inputs
Power units 05.01
The internal switches S1, S2, S16, S19, S20 can be used to adapt the thyris-
tor power unit to suit the available control signal (controller output signal).
There are separate voltage and current control inputs. The current inputs (+,-)
are designed for a differential current signal, i.e. they can have a common po-
tential that is up to 10V above or below the ground reference potential (⊥).
If the current and voltage inputs are used simultaneously, they have an addi-
tive effect. Both analog and logical controller output signals may be used.
Control signal
Signal start
Signal end
0 mA
20 mA
4 mA
20 mA
0 V
10 V
2 V
10 V
0 V
5 V
1 V
5 V
logic levels 0/10V 0/5V, 0/20mA or
floating contact
The thyristor power unit can be operated by the following signals (for analog
power regulation):
- voltage signal (Terminals 3, 4)
- current signal (Terminals 1, 2)
- 5 kΩ potentiometer (Terminals 3, 4, 5)
A 10 V source is provided at Terminal 5 for use with a potentiometer. The
switch settings are the same as for a 0 — 10 V signal.
Internal switch
S1
S2
1
0
0
0
1
0
0
0
1
0
0
0
0
1
6 Settings
S16
S19
S20
0
1
0
2
0
1
0
2
1
1
1
2
1
2
1
43
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