Santerno Sinus Penta - Example 1: Dry Run Detection

PROGRAMMING GUIDE
SINUS PENTA
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Examples
This section covers some examples for the supervision of pumping systems with the PID control algorithm.
The settings of the parameters being used are given in the tables below: the parameters highlighted in grey have no
effect.
Example 1: Dry Run Detection
For most pumps, especially submersible bore-hole pumps, it must be assured that the pump is stopped in case of dry
run. This is assured by the Dry Run Detection feature. How Does It Work?
Dry run detection is based on power/frequency monitoring. Stop (trip) due to dry run is initiated under the following
conditions:
Table 63: MPL parameterization for Dry Run Detection
P359
MPL2: Digital output mode
DOUBLE ANALOG
P360
MPL2: Selecting variable A
A77: Output Power
P361
MPL2: Selecting variable B
A86: PID Feedback
P362
MPL2: Testing variable A
<
P363
MPL2: Testing variable B
<
P364
MPL2: Comparing value for Test A
Min. operating PWR [*]
P365
MPL2: Comparing value for Test B
Min. FBK value [*]
P366
MPL2: Function applied to the result of the 2 tests
(A) AND (B)
P366a
MPL2: Selecting variable C
D11: PID Out Max
P366b
MPL2: Function applied to the result of f(A,B) C
f(A,B) AND (C)
P367
MPL2: Output logic level
TRUE
NOTE
It is recommended that a TIMEOUT be entered for Dry Run Detection.
Enter a timeout for
MPL2 output (see TIMERS MENU).
P368
MPL3: Digital output mode
DOUBLE ANALOG
P369
MPL3: Selecting variable A
A77: Output Power
P370
MPL3: Selecting variable B
A86: PID Feedback
P371
MPL3: Testing variable A
≥
P372
MPL3: Testing variable B
<
P373
MPL3: Comparing value for Test A
Min. operating PWR [*]
P374
MPL3: Comparing value for Test B
Min. FBK value [*]
P375
MPL3: Function applied to the result of the 2 tests
(A) AND (B)
P375a
MPL3: Selecting variable C
D51: MPL2
P375b
MPL3: Function applied to the result of f(A,B) C
f(A,B) OR (C)
P376
MPL3: Output logic level
TRUE
NOTE
MPL3 detects when piping is clogged or faulty or when the delivery/pressure sensor is
malfunctioning (e.g. the pump membrane is locked) when the sensor is located downstream
of the mains.