WAGNER TITANIUS TOP-SENS, Technical Manual

Page: 122 / 250

Installation
TITANUS
TOP·SENS
®
/Rev.a
122 06/13
Installation of the reset board
The reset board can be installed into TITANUS
TOP·SENS
®
as an option. If
several TITANUS
TOP·SENS
®
are connected to one detection line the reset
board is only installed to the last TITANUS
TOP·SENS
®
on the detection
line. The electrical connection of the reset board is made according to the
connection diagram in chapter "Electrical connection".
NOTICE
The reset board can only be used if the quiescent current of the detection
line is between 5 mA and 50 mA and if the end of the detection line is an
ohm-resistor. The reset-pulse is activated if the line voltage falls below 3 V
while resetting the central unit.
The quiescent line current, IR, is calculated as follows:
E
L
R
R
U
I

with R
E
= original end-of-line resistor in Ω
U
L
= line voltage in V
I
R
= quiescent current of the line in [A]
The formulas to calculate the end-of-line resistor and the quiescent cur-rent
of the detection line take into consideration the ideal state of the signal
evaluation.
If there is no acknowledgement from the calculated end-of-line resistor of the
reset board, the end-of-line resistor value must be reduced by about 20%.
The reset board replaces the detection line resistor. It is re-calculated and
installed on the reset board (connector X1). The value of the end-of-line re-
sistor R
ER
must be calculated as follows:
R
L
ER
I
V U
R
7 , 2


6.4
Quiescent line current
End-of-line resistor