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The SWITCH input (CONTACT) count for measure the continuity of an external contact connected at the
input SWITCH on PCA-570. When there is continuity, the input show CLOSE, the opposite show OPEN.
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By selecting previously the indication of pressure in the channel-2, in SWITCH is enable the function of
automated PRESSURE SWITCH test. On this function is possible verify the values of opening and closing contact at
pressure switch. For this, is necessary a pressure source that varies in a ramp more slowly, for high precision. For
this tests, is recommended increase the read rate of the A/D converter to FAST. See more information's in the
section 2.4.7 - A/D RATIO.
Select SWITCH and then PRESSURE SWITCH. The next screen is shown. Fill the camps of pressure
switch identification and the values to TRIP (value for closing/opening of pressure switch relé), DEAD ZONE (value of
pressure switch hysteresis) and TRIP ERROR/DEAD ZONE ERROR (values of tolerance for error of trip and dead
zone for pressure switch approval/disapproval). For issue of test report, use the function TASKS.
Fig. 14 - Pressure Switch Test
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