Purging Pressure "P3; Maximum Internal Pressure "P4 - Pepperl+Fuchs Bebco EPS 5500 Series User Manual

4.5.2.3 Purging Pressure "P3"

The purging timer starts when enclosure pressure is above P3. If the enclosure pressure is above P3,
purging will start and finish uninterrupted. If the enclosure pressure is below P3, the purging timer will not
start. If the enclosure pressure drops below P3 during purging, the purging timer will immediately reset to
its beginning time and will not start timing down until enclosure pressure is above P3. P3 can be adjusted
to above P2 and below P4 values.

4.5.2.4 Maximum Internal Pressure "P4"

If enclosure pressure is above P4, the display will read 'MAX' to indicate that maximum pressure has
been achieved. Regardless of the action of the solenoid valve (purging, leakage compensation), the
solenoid valve will de-energize and will not come on until enclosure pressure goes below P4. This action
may cause the solenoid valve to oscillate on and off. If this happens, it should be noted as a maximum
pressure problem.
If K1 was on before P4 was reached, it will remain on after enclosure pressure is above P4. P4 is
adjusted above P3. Maximum setting is 25 mbar (9.99 in wc).
Leakage Compensation Hysteresis "HYST"
In operation mode, there may be excess leakage of pressure from the enclosure due to a faulty seal
or gasket. There could also be enclosure pressure loss due to a drop in regulated line pressure. The
leakage compensation option allows the SV to turn on to compensate for these unintentional leakages.
Depending on the purge program being used, the SV will energize when below P* and will de-energize
when is above P* + hysteresis.
Note
If leakage compensation is not required, set HYST to '0'.
Set values for P1, P2, P3, and P4 using this procedure.
P*= P2 when using Program 1, 2, 3, or 5. P*= P3 when using Program 4.
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