Diagnosing and troubleshooting
10.4 Noise problems
HydroRanger 200 HMI
Operating Instructions, 06/2018, A5E36281317-AC
287
10.4.1
Determining the noise source
Disconnect the transducer from the device. If the measured noise is below 5 dB, then
continue here. If the measured noise is above 5 dB go to Non-Transducer Noise Sources
below.
1.
Connect only the shield wire of the transducer to the device. If the measured noise is
below 5 dB, continue with the next step. If the noise is above 5 dB, go to Avoiding
common wiring problems (Page 288).
2.
Connect the white and black transducer wires to the device. Record the average noise.
3.
Remove the black wire of the transducer. Record the average noise.
4.
Re-connect the black wire and remove the negative wire. Record the average noise.
Using the table below, determine the appropriate next step. The terms higher, lower and
unchanged refer to the noise recorded in the previous steps.
These are guidelines only. If the suggested solution does not solve the problem, try the other
options also.
Noise
- removed
+ removed
Go to:
higher
higher
Reducing electrical noise (Page 288)
unchanged
Avoiding common wiring problems (Page 288)
lower
Reducing acoustical noise (Page 288)
unchanged
higher
Reducing electrical noise (Page 288)
unchanged
Contact Siemens representative
lower
Reducing acoustical noise (Page 288)
lower
higher
Reducing electrical noise (Page 288)
unchanged
Avoiding common wiring problems (Page 288)
lower
Reducing acoustical noise (Page 288)
Acoustical noise
To confirm that the problem is acoustical, place several layers of cardboard over the face of
the transducer. If the noise is reduced, the noise is definitely acoustical.
10.4.2
Non-transducer noise sources
Remove all input and output cables from the device individually while monitoring the noise. If
removing a cable reduces the noise, that cable may be picking up noise from adjacent
electrical equipment. Check that low voltage cables are not being run adjacent to high
voltage cables or near to electrical noise generators such as variable speed drives.
Filtering cables is an option but is not recommended unless all other options have been
exhausted.
The device is designed to work near heavy industrial equipment such as variable speed
drives. Even so, it should not be located near high voltage wires or switch gear.
Summary of Contents for HydroRanger 200 HMI
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