Operating Instructions

Siemens Industry, Inc. • 88 Siemens Application
24-hour support [phone] (Dial 2)
Enable process supervision (P3.12.5.1)
Figure 32. Process supervision.
Upper and lower limits around the reference are set. When the actual value goes above or below, a
counter starts counting up towards the Delay (P3.12.5.4). When the actual value is within the allowed
area, the same counter counts down instead. Whenever the counter is higher than the Delay, an alarm
or fault (depending on the selected response) is generated.
PRESSURE LOSS COMPENSATION
Figure 33. Position of pressure sensor.
If pressurizing a long pipe with many outlets, the best place for the sensor is probably halfway down the
pipe (Position 2). However, sensors may, for example, be placed directly after the pump. This will give
the right pressure directly after the pump, but farther down in the pipe the pressure will drop depending
on the flow.
11108.emf
Regul at ing m ode
Upper limit
P3.12.5.2)
Lower limit
(P3.12.5.3)
Act ual val ue
Delay (P3.12.5.4)
Alar m or fault
Ref er ence
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PTPT
Pressure
No flow
W
i
t
h
f
l
o
w
Pipe l ength
Position 1 Position 2