Alstom Reason RPV311, Technical Manual

Page: 83 / 350

RPV311 Chapter 4
– Configuration
RPV311-TM-EN-6 83
8 DC CHANNELS
The signal of the transducer (±10 V or 0-20 mA) is converted in to the desired physical measurement using a
first order transfer function with the parameters of gain (
𝐴
) and offset (
𝐵
) defined by the user:
𝑦 = 𝐴𝑥 + 𝐵
where
𝑦
is the converted value and
𝑥
is the value read by the DC channel in Volts or Amps.
The RMS value of the DC channels (transducers) is calculated every cycle.
To add a new DC channel select the DC C
HANNELS
section and fill in the following:
The I
DENTIFIER
text field allows user to enter a single code for the channel being defined (maximum 12
characters). No editing allowed;
The I
NPUT
scroll box allows user to define the input to which each DC channel is connected. No editing
allowed;
The F
REQUENCY REFERENCE
scroll box allows user to select a reference voltage circuit;
The G
AIN
and the O
FFSET
text field allows user to define the transfer connected transducer function;
The U
NIT
text field allows user to define the connected transducer unit (maximum 6 characters, letters only).
Once the DC channel is created, it shows in the configuration interface menu. When selecting the DC
channel, a screen shows the characteristics of the DC channel selected, as shown in Figure 26 . It is
possible to edit the frequency reference, gain, offset and unit.