CD Automation srl CD3000E-3PH from 25A to 500A User’s Manual
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12.5 Digital Input
The CD3000E thyristor unit has 4 digital inputs opto-isolated to 12Vdc.
You can activate the inputs with the internal supply (see par. 7.4) or with an external source for
example the PLC.
12.5.1 Reset alarm (Terminal 17)
The Reset Alarm is used for restore the unit after an alarm occurs.
Before using this input you must resolve the fault or the alarm status come back.
12.5.2 Start/Stop (Terminal 18)
This is the start command of the CD3000E thyristor unit and active the relative digital output (terminal
13 and 14) connected to the main contactor, if no alarm occurs, the CD3000E thyristor unit give an
output proportional at the input signal.
If you Remove the Start command the CD3000E thyristor unit will be stopped and the output will return
at zero following the ramp. When the ramp is over the Run contact will be reopened and the main
contactor goes down.
12.5.3 Calibration (Terminal 19)
The Calibration input activates the Calibration procedure that is necessary if you use the Burst Firing
(BF) or the Heater break alarm (see par. 9.4).
12.5.4 Configurable Input (Terminal 20)
This digital input is configured by the parameter P103 and could perform different functions:
• Additional Reset Alarm:
This function is the same of the Reset Alarm command.
• Setpoint zero:
This function forces the output at zero maintaining the Run contact closed.
• Feed-Back Selection:
With this function, when you active the input, the feed-back setted in the parameter P070
change in Voltage Feed-Back (V).
• Analog/Digital Setpoint:
With this function, when you active the input, the setpoint reference change from Analog input to
Digital value, setted in the parameter P004 (see par. 14.1).
• External Alarm:
With this function the thyristor unit, to work, must not have this digital input active.
When the unit is in Run and you active the External Alarm, the unit will be stopped and the output
goes at zero without follow the ramp. The Run contact at the terminals 13 and 14 will be
immediately reopened and the main contactor goes down. The External Alarm activates also the
Critical Alarm digital output.
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