INTERNORMEN IFPM21 - Indication of Filter Clogging; Input and Output Seizure

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4.6.2. Indication of filter clogging

- t

pressure peak suppression

0...60 s

• ϑ

ϑϑ

cold start indication (Fluid temperature < 25 °C), no indication about contamination

• < 50%

filter element not used, pressure difference: < 50 % ∆p-nominal

• 50%

starting contamination, pressure difference: ≥ 50 % ∆p-nominal

• 75 % and S1

moderate contamination, pressure difference: ≥ 75 % ∆p-nominal, warning contact 1

switched

- 90 % and S1

strong contamination, pressure difference: ≥ 90 % ∆p-nominal

- 100 % and S2

filter element used, pressure difference: ≥ 100 % ∆p-nominal, warning contact 2

switched

4.7. Input and output seizure

• The digital inputs of the PLC are used as follows:

Input N°

Function

1 lower sensor (min.)

2 middle sensor (max)

3 upper sensor (Overcharge lock)

4 signal "filter clogged"

5 oil level switch for the vacuum pump

6 motor protector hydraulic pump

7 motor protector vacuum pump

• The temperature sensor of the vacuum chamber is connected to the analogue input

N°1.

• The temperature sensor of the heating element is connected to the analogue input

N°2.