6 Reference and Specification
K0443 Revision A 6 - 26 [EN] English
Switch Test option
This function automates the testing of
pressure switch devices. Connect the
pressure port of the switch to be tested to
the output port. Connect the switch
contacts in series with the 24V dc output
and the Logic Input.
Note: The volt-free logic input connections
require a switching potential (24V max) to
be applied. If necessary, this can be an
external d.c. source. Common mode must
be kept within 30V maximum.
Start
Controls pressure at a fast slew rate to a
set-point just below expected switch
operating point. De-bounce time can be
increased for slower test slew rates.
Test
Controls pressure between two set-points and can repeat (loop). Auto-reverse can be selected.
End
Controls pressure to a safe condition to disconnect switch under test.
Procedure
Select the switch test parameters in the switch test menu, including the start pressure, end
pressure and test rate of change. Slower rates give more accurate results. The de-bounce time can
be set between 0 and 200 ms.
After the test, the display shows the pressures at which the contacts open and close and the
switch hysteresis (the difference between the two switching pressures).
Before disconnecting the switch under test,
press Release pressure to release any
residual pressure.
Note: This switch test procedure can be
repeated to “exercise” the switch unit.
Logic input is opto-isolated. An external
supply (5V to 24V dc) can be used provided its’
common mode voltage remains with 30V
max with respect to chassis.
Example Switch Test Connections
Example of setting a
parameter
Switch test
Switch test
Stop
Release pressure
Switch Test Parameter
Selection
Start
SUPPLY
OUTLET VENT REF
+-
Pressure Module
Pressure Switch
+
24V
-
0V
DC Output
Logic input
(24V max)
PACE