Troubleshooting guide

86
The procedure to Change Scale Factors on 2783J
Qualified Board
1. From the Main Screen, press the Menu button.
2. From the Menu Screen, press the Vilter ONLY
screen.
3. Logon
4. From the Vilter ONLY screen, press the Raw
Data Screen button.
You will now see a screen labeled “Data
Test”, containing 4 columns, 2 labeled
“Index” and 2 labeled “Value”.
5. Press the “Set” button and then press one of the
blank boxes under either one of the Index col-
umns.
6. A keypad will be displayed. Now type in
“N658” (without the quote marks). Press the OK
button. (Per the table, this is the Index for the
Suction Pressure transducer.)
7. You are now returned to the “Data Test” screen.
You will see “N658” in the box that you touched,
and you will see the value 3950 in the corre-
sponding “Value” box. This is the scale factor
that will be changed.
8. Now press the “Set” button again, and press the
“Value” box that contains the value 3950. A
numeric keypad will now be visible.
9. Press the Clear button. Now press the buttons
4297, followed by pressing the “Enter” button.
You will now be returned to the “Data Test”
screen, and the Value field that previously con-
tained 3950 now contains the Value 4297. Per
the table below, you have now corrected the
scaling factor for the Suction Pressure trans-
ducer.
10. Continue this process, entering in “Index” val-
ues and changing the scaling factors for all trans-
ducers. (Reference Figure 1 below.)
11. When completed, press the OK button and re-
turn back to the main screen.
12. Now go to the LOGON screen and perform a
“BACKUP SETTINGS”. After a minute or so,
the new scale factors will be “active”.
13. You may now need to recalibrate your trans-
ducers again, as the new scale factors will af-
fect the current readings of the transducers. If
you have gauges on your system, you can do
this using your gauge readings. When you have
completed re-calibration of all your transduc-
ers, do another “BACKUP SETTINGS”.
Modifications for Analog Board (Vission/Vantage after July 2003)
2895A 3011A Vission 3011C1 Vantage 3011A Vission 3011C1 Vantage
(2783J qualified) (2783J qualified)
Ametek Yes Yes Yes Yes Yes
VPN 2783G
Danfoss No* No No Yes-Rescale Yes-Rescale
VPN 2783J
Setra Yes Yes Yes Yes Yes
VPN 2783K
Table II The acceptable mix of analog boards and transducers.
No* = this combination of board and transducer will result in a very slight scaling error (2 percent error over entire
0-300 PSIG range of transducer). Vilter does not recommend using the Danfoss transducer with a 2895A board.
Warning -If a Danfoss Transducer is used with a non-qualified 2783J Analog Board, the transducer will not
properly read pressures over 165 PSIG.