Connection; Connecting The Load Cells - Siemens SIWAREX WP241 Manual

Connecting
6.2 24 V connection
6.2 24 V connection
The 24 V DC supply voltage is connected by means of the corresponding terminals on the
electronic weighing system.
Table 6- 1
Labeling
L +
M
6.3

Connecting the load cells

Overview
Pickups can be connected to the SIWAREX WP241 electronic weighing system which are
equipped with strain gauges (full bridge) and meet the following requirements.
● Characteristic value 1 to 4 mV/V
● A supply voltage of 5 V is permitted
● Maximum cable length between WP241 and junction box 1 000 m
The power supply for the load cells is 4.85 V.
The following condition must be satisfied in order to check the maximum possible number of
load cells which can be connected to a WP241:
● Scale operation without Ex interface: (input resistance of load cell) / (number of load cells)
> 40 Ohm
● Scale operation without Ex interface: (input resistance of load cell) / (number of load cells)
> 50 Ohm
26
Connection of the 24 V supply
Function
+24 V voltage supply
Ground voltage supply
SIWAREX WP241
Manual, 04/2014, A5E33713528A