LCDA-P Power Display
1
Continental Control Systems
LLC
Application Note: AN-116
July 2008
LCDA-P Power Display
Overview
The power display has eight digits with an adjustable scale factor and decimal point posi-
tion, to allow for the accurate display of power levels from tenths of a watt to megawatts.
The power display is self-powered for use with the Advanced Pulse WattNode models with
an output frequency up to 20Hz. For Advanced Pulse WattNode models with an output fre-
quency greater than 20Hz an external DC power supply and pull-up resistor are required.
Wiring
Low Pulse Frequency (up to 20Hz)
Connect the WattNode’s ‘P1’ terminal of the output to the IN B (Terminal 2) on the LCD
display. Connect the WattNode’s ‘COM’ terminal of the output to the GND (Terminal 1) on
the LCD display.
P1
P2
P3
COM
A CT
O
/
B CT
O
/
C CT
O
/
tu
pt
u
O
B
O
/
C
O
/
Status
Status
Status
W
ATT
N
ODE
®
WNB-3Y-208-P
N
A
O
/
5 Enable/R
RST 4
IN A 3
IN B 2
GND 1
6 DC Common
7 +10-30VDC
LCDA-P Low Pulse Frequency Wiring Diagram
Figure 1:
High Pulse Frequency (greater than 20Hz)
Connect the WattNode’s ‘P1’ terminal of the output to the IN A (Terminal 3) on the LCD
display. Connect the WattNode’s ‘COM’ terminal of the output to the GND (Terminal 1) on
the LCD display. Add a pull-up resistor on the P1 line as shown below. See
Table 1
below
for recommended pull-up resistor values.
P1
P2
P3
COM
A CT
O
/
B CT
O
/
C CT
O
/
tu
pt
u
O
B
O
/
C
O
/
Status
Status
Status
W
ATT
N
ODE
®
WNB-3Y-208-P
N
A
O
/
5 Enable/R
RST 4
IN A 3
IN B 2
GND 1
6 DC Common
7 +10-30VDC
+5V to +28Vdc
Resistor values
See Table 1
LCDA-P High Pulse Frequency Wiring Diagram
Figure 2:
