The Electrical Circuit - ABB PFTL 101 User Manual

Pressductor PillowBlock Load Cells, Horizontal Measuring PFTL 101, User Manual
2 Description
2.6
3BSE009965R0401 en Rev E
When calculating it is important that the angles are set into the equations with the correct signs in
relation to the horizontal plane, see
T
-α
F
Tare
F
V
Figure 12. Inclined Mounting

The Electrical Circuit

The electrical circuit of the load cell is shown in the diagram below.
Figure 13. Load cell circuit diagram
The load cell is supplied with a 0.5 A, 330 Hz alternating current. The secondary signal is calibrated
for the correct sensitivity with a voltage divider R
by thermistors T.
All resistances on the secondary side are relatively low. The output impedance is typically 1-3 Ω ,
which helps to suppress interference.
Figure 12. Inclined Mounting page
Horizontal plane
+α
+β
T
R
T
-γ
R
1
T
0.5 A/330 Hz
- R , and temperature compensation is provided
1 2
17.
T
-β
F
R
F
V
Tare
+γ
C
Secondary circuit
R
(signal)
2
D
A
Primary
circuit
B
(supply current)
17