Applications; Flow Control - Proces-Data PD 340 Manual

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8 Applications

8.1

Flow Control

Manual/
auto
A centrifugal pump, a PD 340 Flow Transmitter, and a modulating valve with an I/P con-
verter can form an accurate FLOW CONTROL SYSTEM. Such a system is more accurate,
and also normally less expensive than systems using a positive pump with variable speed.
The PD 340 Flow Transmitter has a built-in PI-REGULATOR, which can be operated in
AUTO as well as in MANUAL. Input1 is used for this manual/auto selection.
The requested flow rate is keyed into SETPOINT on the connected PD 210 display. The
output value can be read in % by pressing the untitled key to the left of VOL.2. If the regula-
tor is in MANUAL, the operator can key the requested output position into the same regis-
ter.
Programming
To enable the PI REGULATOR function in the PD 340, the Flow Transmitter should be
programmed in the following way: The * indicates that these digits are not in use for this
function but should be programmed according to the meter size and other working condi-
tions of the Flow Transmitter. The program enable switch must be in position ON during
programming.
E1: ******
E2: --Ti--
E3: 0000AB
E4: ******
42/55
DISPLAY FOR
FLOW TRANSMITTER
FLOW TEMP. VOL.1 SETP.
T.C.
VOL.2
FLOW
E5: P-band
E6: ******
E7: 18**0*
E8: ******
Flow Transmitter, PD 340
PD 210
DISPLAY FOR
=
FLOW TRANSMITTER 7 8 9
5 6
E 4
2 3
FLOW TEMP. VOL.1 SETP. TEST 1
,
T.C.
VOL.2 CE 0 +/-
FLOW
PD 210
551 114 01
=
7 8 9
E 4 5 6
1 2 3
TEST
,
+/-
CE 0
PD 210
551 115 01
Manual