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The P-band indicates the proportional sensitivity in the same flow units as the "FLOW" reg-
ister (l/h or gallons/min.). The P-band is equal to the change in flow rate, which will change
the output from 0 to 100%. A typical setting of E5 is 25% of max. flow.
The Ti is the regulator's integration time in seconds. Ti is equal to the time the integrating
part of the regulator requires to provide the same change on the output as the proportional
part for a step in flow rate. A typical Ti time is 2 sec. The P-band and the Ti can be opti-
mized by experiment, or by following the rules available in specialized literature.
There are two types of valves. Digit 5 in E3 is set to 0 if the valve is normally closed at 4
mA, or set to 2 if the valve is normally open at 4 mA.
Digit 6 in E3 determines the function of the AUTO/MAN. Digit 6 = 0: The regulator is always
in auto. Digit 6 = 2: If Input1 is ON, the regulator is in MANUAL, otherwise in AUTO.
The P-band, Ti and Setpoint can always be changed, because these registers are stored in
RAM. The contents will disappear after a power-cut, unless the programme enable switch
is in position ON. In this case the contents of P-band, Ti and SETPOINT are stored in
EEPROM, and restored in RAM after power-up. The program enable switch must be
switched off after programming, to preserve the EEPROM memory.
Electrical connections
Input 1
24 v
Output 3
4-20 mA
Display
Output 1
24-32 V
Output 2
Power
Input
It is very important to select the correct valve size. Which size to choose depends on the
following information: The min. and max. flow rate, the flow/pressure curves of the pump,
and the pressure drop in the pipe work at the specified flow rate. It is normally recom-
mended to ask the supplier of the modulating valve to select the size.
Manual
PD 340
-
20
+
19
+
18
-
17
-
8
+
7
-
6
+
5
4
3
-
2
+
1
Flow Transmitter, PD 340
Input 1
4-20 mA
-
+
-
DISPLAY FOR
FLOW TRANSMITTER
=
7
8
9
E
4
5
6
+
FLOW
TEMP.
VOL.1
SETP.
TEST
1
2
3
T.C.
CE
0
,
+/-
VOL.2
FLOW
PD 210
PD 210
24 V AC/DC
551 116 01
502 010 05
43/55
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