KROHNE BM 90 EN - Manual (Page 5)

5
1.2.3. Programming example
The following example shows how Level-Sonic BM90
should be programmed for a simple level application
including setting a high alarm.
Having changed the value in Pr.01 to = 1 (level
Press
‘s‘ Display Pr.02 = 2 (units in meters)
‘s‘ Change Pr.03 = 1.5 (empty distance)
‘s‘ Change Pr.04 = 1.0 (operational span)
‘s‘ Change Pr. 05 = 0.5 (blanking distance)
‘s‘ Display Pr.06 = 1 (rate of change of
level in metres)
Press Pr.08 Change Pr.08 = 1 (relay 1 designated
normally energised)
‘s‘ Change Pr.09 = 0.7 (relay 1 set)
‘s‘ Change Pr.10 = 0.5 (relay 1 re-set)
M O D E to return to normal running
For a full description of parameter options, please refer to
chapter 3.
Note : The display does not show the decimal point until
the first decimal figure is keyed in.
1.3. Program checking
To check that the previous program functions properly,
hold the transducer approximately 1.5 m above a surface
and press ‘MODE‘ to return to the run condition.
The display will read approximately zero.
If it displays LOST it is because the transducer is more
than the 1.5 metre (distance to furthest point) from your
target. Go closer and wait for LOST to change to 0.000
and then a level.
By slowly moving the transducer towards the surface, the
display will increase simulating a rising level. When the
display exceeds 0.7 the relay will switch, as indicated by
the light on relay 1, and if the transducer is then raised,
the display will decrease and the relay will reset below
0.5.
1.3.1. Program correction or
resetting factory defaults
If at any time you feel that a mistake has been made, the
following routine clears the program back to the known
starting position of the factory set values shown on
page 26. It is also advisable to return to the factory
default values before building a program for a new appli-
cation. This is achieved as follows :
Press
‘M O D E‘ to display PROG .
1 immediately to display a Pr number
‘99‘ to display Pr.99.
D S P to show ====
‘C E‘ to clear the display.
‘E N T‘ to display COdE requesting the security
code.
‘9753‘
‘E N T‘ the display will now show ‘t.rES‘
followed by ’P.rES’ and finally ‘====‘.
‘D S P‘ to display ‘Pr.99‘ and now the new
program can be entered.
The above is a brief introduction.
1.0 (Pr.4)
1.5
(Pr.3)
0.5 (Pr.5)
Relay 1 Reset
0.5 (Pr.10)
0.7 (Pr.9)
Nota : To understand programming completely it is necessary to read the detailed section describing Programming,
Section 3, along with the parameter descriptions, Section 4, and the examples, Section 5, before continuing.