FISCHER DE44, Operating Manual

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5 Commissioning
All electrical supply, operating and measuring lines,
and the pressure connections must have been cor-
rectly installed before commissioning. All supply
lines are arranged so that there are no mechanical
forces acting on the device.
Check that the pressure connections do not leak
before commissioning.
5.1 Display
•
The 3.5 digit LCD display represents the cur-
rent differential pressure in normal mode.
•
The selected measuring unit is illuminated on
the right of the display.
The units shown in the picture may vary from
the actual model.
•
Two light diodes

and

above the display in-
dicate the status of the switching outputs. As
soon as the switch is closed, the respective
LED shines.
•
On the left side, P1 and/or P2 show which
channel is currently being displayed.
When the parameters are being set, the display ei-
ther shows the respective menu item or the associ-
ated parameter value. The device continues to
function whilst the parameters are being set; apart
from two exceptions, the changes come into effect
instantly.
The exceptions are firstly a change of switching
times
– here, the previously valid time needs to
have ended and a change to the support point table
(see 5.3.8 or 5.3.9). Here all output signals and
switching states are frozen until the changes have
been completed.
5.2 Operating keys
The operating keys have the following function:
ÿ
Page down menu
Reduce value
û
Enter key
þ
Page up menu
Increase value
5.3 Configuration
For commissioning there is a multitude of setting
options for optimum adaptation of the device to the
measuring point and task at hand. This section co-
vers these options step by step.
Depending on the device model
1
some menu items
may not be available. For example, all characteristic
curve functions are faded out in the menu if the de-
vice does not have a signal output.
It is possible to completely configure the
device using a PC adapter at the PC.
Here all parameters are directly visible
and accessible. Also, the entire configu-
ration can be loaded, saved and documented as a
printout. For more information about this program,
please refer to the program documentation (cf. Ac-
cessories).
5.3.1 General points
Connect the device to the power supply and ensure
that it is not under any pressure (if necessary, dis-
connect any pressure lines).
Proceed as follows to set a parameter:
•
Press the enter key
û
to switch to the menu.
ESc
will appear on the display.
•
Use the arrow keys
ÿ þ
to select a parameter
from the list.
•
Press the enter key
û
to call up the parameter.
•
Use the arrow keys
ÿ þ
to set the required val-
ue.
•
Press the enter key
û
to save the value.
After setting all parameters, leave the menu as fol-
lows:
2
•
Use the arrow keys
ÿ þ
to set the
ESc
parame-
ter. You will find these at the start and also at
the end of the list of parameters.
•
Press the enter key
û
to leave the menu.
5.3.2 Selecting the pressure unit
First select the pressure measuring unit. The unit
that is currently valid is illuminated to the right of the
number displays. Press the middle key
û
to make
the setting and then search for the parameter
EIN
using the right-hand key
þ.
Press
û
again an then
change the displayed value using
þ
or
ÿ
.
1 = top
2 = middle
3 = bottom
1
with regard to the transmitter signal, voltage output, current
output, etc.
2
All set parameter values are only valid once you leave the
menu via the
ESC
parameter.
Switching output 1 Switching output 2
3.5 character LED display
Operating keys
Measuring unit
Channel no.