Siemens 7ML19985AB01 Manuel D’Utilisation
The 0% and 100% limits of the auxiliary input must be scaled using parameters P43
and P44.
and P44.
» select P43
» enter the voltage corresponding to zero head
» select P44
» enter the head corresponding to 5 V.
» 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.
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.
auxiliary device. The input voltage level can be viewed via D13.
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.
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.
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.
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.
Current Input
Auxiliary Input
(additional to Basic Wiring)
Voltage Input
typical 1 - 5 V signal from
auxiliary device.
auxiliary device.
typical 4 - 20 mA signal from auxiliary device.
Add terminating resistor.
e.g. 250
Add terminating resistor.
e.g. 250
Ω for 1 - 5 V over 4 - 20 mA.
Signal must be positive with respect to ground.
7ML19985AB01
OCM III
37