Siemens 7ML19985AB01 instruction manual DC Output, Diagnostic Aids, 100% head 4 m, enter 5 m

The 0% and 100% limits of the auxiliary input must be scaled using parameters P43 and P44.

»select P43

»enter the voltage corresponding to zero head

»select P44

»enter the head corresponding to 5 V.

e.g.	if the head output is 1 V per m and the output is scaled for 7 V at
	100% head (7 m), then enter 5 m. If the output is scaled for 4 V at
	100% head (4 m), enter 5 m.

P43 and P44 can only be accessed if P42 has been set for head determination by an auxiliary device. The input voltage level can be viewed via D13.

Voltage Input Current Input

typical 1 - 5 V signal from	typical 4 - 20 mA signal from auxiliary device.
auxiliary device.	Add terminating resistor.
	e.g. 250 Ω for 1 - 5 V over 4 - 20 mA.

Signal must be positive with respect to ground.

Auxiliary Input (additional to Basic Wiring)

DC OUTPUT

The OCM-3 provides a 24 V DC output that can be used to supply power to a remote customer device. The output is not isolated from the DC rails that supply the OCM-3 electronics and no overload protection is provided. As such, the output must not operate beyond its specified capacity.

DIAGNOSTIC AIDS

D15 through D18 are diagnostic aids to Milltronics service personnel when troubleshooting system problems.

D18 also serves as a performance indicator by displaying the number of valid echos received as a percentage of the number of pulses being fired by the transducer. A low value indicates that a large proportion of the pulses fired are not producing valid echos. In such instances, the transducer should be checked for proper mounting and aiming or the transducer wiring checked for excessive noise. If the value is zero, shorted or opened transducer wiring may be suspect.

7ML19985AB01 OCM III 37