Wika DPT-10 Manual do Utilizador descarregar pdf (Página 69)

9 Maintenance and fault rectiﬁcation

9.1 Maintain

When the instrument is used properly, no special maintenance is

required in normal operation.

In some applications, product buildup on the separating diaphragms

can inﬂuence the measuring result. Depending on the sensor and

application, take precautions to ensure that heavy buildup, and

especially a hardening thereof, is avoided.

9.2 Rectify malfunctions

The operator of the system is responsible for taking suitable measures

to rectify malfunctions.

DPT10 oﬀers maximum reliability. Nevertheless, faults can occur

during operation. These may be caused by the following, e.g.:

l Sensor

l Process

l Voltage supply

l Signal processing

The ﬁrst measures to be taken are to check the output signals as well

as to evaluate the error messages via the indicating and adjustment

module. The procedure is described below. Further comprehensive

diagnostics can be carried out on a PC with the software PACTware

and the suitable DTM. In many cases, the causes can be determined

this way and faults rectiﬁed.

? When an additional instrument is connected, the segment fails.

l Max. supply current of the segment coupler exceeded

à Measure the current consumption, reduce size of segment

? Wrong presentation of the measured value in Simatic S5

l Simatic S5 cannot interpret the number format IEEE of the

measured value

à Insert converting component f rom Siemens

? In Simatic S7 the measured value is always presented as 0

l Only four bytes are consistently loaded in the PLC

à Use function component SFC 14 to load 5 bytes consistently

Maintenance

Reaction when malfunc-

tions occur

Causes of malfunction

Fault rectiﬁcation

Checking Proﬁbus PA

Diﬀerential pressure transmitter DPT10 - metal measuring diaphragm • Proﬁbus PA 69

9 Maintenance and fault rectiﬁcation

37245-EN-100120

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Wika DPT-10 Manual do Utilizador Página 69