Page 146
© Copyright 2023 ABB. All rights reserved.
Millennium SC_MAN
Rev 2.0
External Voltage Input (EXT
-
V)
The External Voltage Input (EXT
-
V / EXT
-
VR) is a user configurable analog voltage measurement input.
Configuration via external resistors and software configuration parameters allows a wide range of
input signals to be displayed and reported in the scale and units desired.
Limitations:
EXT
-
V must be positive with respect to EXT
-
VR.
EXT
-
VR may be either floating or referenced to Discharge Ground (DG).
Parameters
Parameters are set via EasyView PC interface or TL1 command line.
•
Range: +5Vdc, +30Vdc, +60Vdc
Set via external resistors and input as parameter
CAUTION
: Appropriate external resistors must be installed to avoid damage to the controller.
•
Scale Factor: positive or negative decimal value
Multiplier of measured voltage to displayed voltage
Set as a parameter.
•
Units: displayed after scaled numeric value
Set as a text parameter.
•
Offset: positive or negative offset to scaled numeric value
Displayed Value
Displayed Value = Measured Voltage x Scale Offset (followed by Units text)
Measured Voltage is the value determined by the input voltage, external
resistors, and the Range parameter.
Example:
For
Range
+30Vdc (external resistors and parameter)
Scale Factor
25 (parameter)
Offset
-
50
Units
PSI
Input
+16V
Display: 350 PSI
= 16 x 25
-
50
External Resistors
•
External resistors must be installed in series with both EXT
-
V and EXT
-
VR inputs.
•
1/8 W minimum
•
1% tolerance, 100ppm/°C is required to meet specified measurement accuracy
24
Resistor Kits include 2 resistor assemblies with pig
-
tail and butt splice attached.
Table 45 External Voltage Input Resistors
Range
Resistors (2 required) 1/8W, 1%, 100ppm/°C
Resistor Kit
24
+5Vdc
10.98k
Ω
150022227
+30Vdc
115.2k
Ω
150022228
+60Vdc
242k
Ω
150022229