CD Automation srl
CD3000E-3PH from 25A to 500A
User’s Manual
39
11.6
Feed-back type
The Feed-back type has already configured in line with customer requirements that are defined in the
Order Code. The Order Code is written on the identification label.
However, if you wish to change the Feed-back type you can use the software configurator or the Control
Panel (see par. 10).
Caution:
this procedure must be performed only by qualified persons.
The Feed-back type is defined by the parameter P070
(see par. 14.3).
If the configurable digital input has set like Feed-Back Selection (see par. 12.5), it's possible to change
the select Feed-Back with the Voltage Feed-Back (V) simply activating the input.
The feed-back defines the Control Mode. It’s possible to have:
•
V=Voltage feed-back.
The input signal is proportional to the output voltage. This means that input signal becomes a
voltage demand. This control mode compensates the voltage fluctuation of the incoming line supply.
•
I=Current feed-back.
The input signal is proportional to the current output. This means that input signal becomes a
current demand. This control mode maintain the current also if the load impedance changes.
•
W=Power feed-back.
The input signal is proportional to the power output. This means that input signal becomes a power
demand. The power remains constant also if voltage and load impedance change. This control mode
is used with silicon carbide elements that change its resistive value with temperature and with age.
In addition it compensates the voltage fluctuation of the incoming line supply.
•
EX=External feed-back 0÷10Vdc (see par. 12.3).
The input signal is proportional to an external signal. This means that input signal becomes a
demand to maintain this signal always constant. This control mode is used for example with
galvanic systems, where it's necessary to control the current value through the electrodes.
11.7
Feedback Option
On request are available also theese feedback:
•
(V2)
V square – instead of V=Voltage feed-back.
•
(I2)
I square – instead of I=Current feed-back.
The settings are factory made via order code, once ordered is impossible to go back to the default
feedback (V and I ).
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