Troubleshooting and Fault Elimination
© Siemens AG, 2004. All rights reserved
8-50 EMC Installation Guideline – Planning Guide (EMV) – 03.2004 Edition
· Elimination of coupling paths to prevent interference sizes on reaching the
interference sink from the interference source (e. g. increase distance between
power and signal lines, inserting shielded lines, conduct lines to mass
proximity).
· Check the adherence of the measures requested in this EMC Guideline and
the product-specific documentation.
Table 8-1 Fault clearance
Misconduct Possible cause Fault elimination
Non-wired coils of contactors, valves,
horns, …
Wire the coils
Adjacent sparking machines (welding
equipment)
Route the lines of the control in another way
(increase the distance to the interference
source)
Transmitter, round control system Additional shielding
Lines with incorrect shield connection,
incorrect core twisting or incorrect
parameters
Use original lines, check the core occupancy
Interruption in the line shield
(e.g. with intermediate switching of a line
distributor)
Connection of the line shields, shielding of the
interruption point
Incorrectly routed equipotential bonding
line
Reroute equipotential bonding line
(see Chapter 4)
Sporadic failure
Contamination of the control Clean control and assemblies, provide for
clean supply air
Such as sporadic failure Such as sporadic failure Remaining offset
Actual value line Route equipotential bonding line between
transmitter housing and control housing or
improve equipotential bonding
Poor equipotential bonding connection
between position transmitter and control
· Provide for extensive, blank, corrosion-
resistant earth connection between
control and position transmitter
· Equipotential bonding line: Increase
cross-section, create direct connection
Large compensating current on setpoint
line shields (analog setpoint)
Interrupt shield connection on the control side
Irregular processing
surface
Foreign drive control: Setpoint input of the
drive control does not suit the Siemens
EMC concept
Change the input wiring of the drive control
(according to the wiring of the Siemens drive
controls)
Flickering screen
characters or screen
Adjacent magnetic field-producing device
(e.g. transformer, electric motor) or line
with current flowing through it
· Increase the distance between the screen
and the interference source
· In extreme cases, shield the screen or
interference source with MUMETALL
®
Extensive off-colours of
the screen display
Magnetic field of an adjacent permanent
solenoid
· Eliminate the interference source
· Shield the interference source with
MUMETALL
®
Note: Picture disturbance disappears without
demagnetization measures only some days
after the elimination of the cause
Transmitter line shield is interrupted
Lines with poor shield features
Insert original lines (product-specific)
Transmitter line shield put on via separate
wire/line
Insert shields on both sides
Transmitter error
Electrostatic charging/discharging of belts
or rotor
Use belts with antistatic coating, earth rotor via
earthing brush.
Telephones, fax
machines, copying
machines are whistling
Fuse case with small
power supply units
Short-circuit capacity of the mains is too
small
· Increase the short-circuit capacity of the
mains
· Supply the affected devices from another
mains
· Insert original filter module
n
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