22
CIT 400
pressure and level
7.4 Changing of pumps
given:
tank (max. level 7 m); medium: water; probe 4-20 mA; measuring range 10 m
required: pen recorder on analogue output 4-20 mA, final peak of pen recorder 20 mA at 7 m;
the process transmitter has to indicate the max. filling level of the tank (7 m); relay 1
should have the function of a limit value switch (on = 6 m; off = 5 m) with a switch-on
delay of 10 seconds; alternating with relay 2 (on = 6 m; off = 4.5 m)
Please note that the values in "S1on" and "S2on" usually have to be higher than the
values in "S1of" and "S2of". To exchange the switching points, please use the menu
contact inverting ("In 1" and "In 2")
Programming
Select the menu "dlS1" in the menu level "dlSP".
Set the following values in the menu level "SinP":
ZPIn
=
0
(starting point of measuring range)
EPIn
=
10
(end point of pressure range)
dP
=
2
(decimal point position)
Select the menu "1" in the menu level "rELn" and set the following values:
HY 1/CP 1 =
HYon
(hysteresis mode)
S1on
=
6
(upper switching point 1)
S1of
=
5
(lower switching point 1)
In1
=
In
(inverting of relay 1)
d1on
=
10
(switch-on delay in seconds)
Select the menu "2" in the menu level "rELn" and set the following values:
HY 2/CP 2 =
HYon
(hysteresis mode)
S2on
=
6
(upper switching point 2)
S2of
=
4.5
(lower switching point 2)
In2
=
In
(inverting of relay 2)
d2on
=
10
(switch-on delay in seconds)
Set the following values in the menu level "Aout":
outY
=
4-20
(output signal in mA)
ZPou
=
0
(min. measured value)
EPou
=
7
(max. measured value)
Select the menu "ALLG" and set the following values:
CHAn
=
On
(change relays)
8. Maintenance
DANGER
Danger of death from electric shock
-
Always service the device in a de-energized condition!
If necessary, clean the housing of the device using a moist cloth and a non-aggressive cleaning
solution.
9. Removal from Service
DANGER
Danger of death from electric shock
-
Disassemble the device in a depressurized and de-energized condition!
