BERTHOLD TECHNOLOGIES LB 480, User Manual

Page: 356 / 450

54733-10BA2L
3 – 356
02.2017
Menu Structure Volume 3
3 Error Current Value

Here you can define the fault current in mA, if you have chosen
Value at Loop Alarm Type . With the settings High and Low ,
the corresponding current values are displayed (>21mA/
<3.6mA).
4 Current Lower Limit
Lower limit of the current range for the 4-20 mA current output.
For adjustment purposes or to safely identify an under measuring
range condition, the current range available for the measurement
signal is extended beyond the standard range of 4-20 mA. Accord-
ing to Namur specifications (NE 43), the lower current value must,
however, not be less than 3.8 mA. However, you can define the
minimum value in the range from 3.8 to 4 mA.
5 Current Upper Limit
Upper limit of the current range for the 4-20 mA current output.
For adjustment purposes or to safely identify an over measuring
range condition, the current range available for the measurement
signal is extended beyond the standard range of 4-20 mA. Accord-
ing to Namur specifications (NE 43), the upper current value must,
however, not be higher than 20.5mA. However, you can define the
minimum value in the range from 20 to 20.5mA.
6 D/A trim
This menu item allows you to adjust the current output. You will
need a power meter which is looped into the current loop. In a
menu-guided process, 4mA and 20mA are defaulted one after the
other. You are prompted to enter the actual value displayed on your
current meter.
IMPORTANT
The impedance on the current output must always be lower than
500ohms, but at least 250ohms.