Omega PSW 31 manual Ofs

Switching Characteristic Graphs

Signal “on” with rising pressure Setting SP* > RP**

Signal “on” with falling pressure Setting SP < RP

Signal “off” with rising pressure Setting RP > SP

Signal “off” with falling pressure Setting RP < SP

pp

SP

RP

RP

SP

t

UA

U

t

p

RP

SP

t

U

t

p

SP

RP

t

UA

t

t

* SP = Switching point

t

**RP = Reset point

Explanation:

When the switching point (SP) is adjusted HIGHER than the reset point (RP), then the switching output will be “normally off”. When the switching point (SP) is adjusted LOWER than the reset point (RP), then the switching output will be “normally on”.

Position of operating elements

E R R O R M E S S A G E S

Pressure display

Switching

function graph

Switching output LED

Switching point button

Raise switching

or reset point button

Reset point button

Lower switching

or reset point button

Display of hardware errors or malfunctions

Display	Meaning	Cause / Remedy
O.Er	Output error	Error at switching output: Circuit-breaker defective, feedback loop
		to processor open circuit. Repair necessary.
E.Er	E2PROM error	E2PROM module defective or connection to processor faulty.
		Repair necessary.
I.Er	Initialization error	Checksum of initialization data incorrect. Remedy: Call up any
		SETUP function and acknowledge the setting with SP.
		This error message is caused by a data error. All setup values
		should therefore be checked and corrected if necessary.
C.Er	Calibration error	Checksum of calibration data incorrect. Recalibration necessary.
SC.L	Short-circuit low	Short-circuit between output and ground. Check wiring:
		Power supply may be too weak for connected load (leading
		to collapse of voltage, particularly with loads with a high switch-on
		current such as incandescent lamps or capacitances).
UFL	Underflow	The applied pressure is below the measuring range:
		Increase pressure until it is within the measuring range.
OFL	Overflow	The applied pressure is above the measuring range:
		Decrease pressure until it is within the measuring range.

Display of hardware errors or malfunctions (can be switched off)

Display	Meaning	Cause / Remedy
SC.H	Short-circuit high	Short-circuit between output and power supply. Check wiring.
		If the switching line from the load (e.g. electrical control
		device, PLC or similar) is being held at an open-circuit
		potential of > 3V, or if several pressure switches are being
		operated in parallel, this function should be switched off.
		Disconnection: ▼ during display test, then adjust with ▼ or ▲.
U.Lo	Voltage low	Power supply voltage too low (<17V).
		Check power supply: Load may be too large.
		Disconnection: ▲ during display test, then adjust with ▼ or ▲.
Messages generated by calling SETUP functions
Cod	Meaning		Requested code or code programming
CLC	Clear code		Deletion of current code
txx	Delay time		Setting of filter time constant
	(Buffering time)		xx = Switching output delay
			xx {03, 06, 12, 24, 50} in ms and
			xx {O.1, 0.2, O.4} in s.
OFS	Offset		Request for offset adjustment using ▼ and ▲ buttons
SC.H	Short-circuit high		Short-circuit monitoring activated
U. LO	Voltage low		Voltage monitoring activated
OFF	Off		Short-circuit or voltage monitoring deactivated
Std	Standard mode		Standard mode activated
HYS	Hysteresis mode		Hysteresis mode activated
FEn	Window mode		Window mode activated
U-C	Voltage calibration		Voltage output selected
I-C	Current calibration		Current output selected