Amada Promecam ITS 50/12 Technical Manual page 12

laMADA
PAOMECAM
3.1.3 -
INTERFERENCES RELATED TO MAINS AND ENVIRONMENT
IMPORTANT
DO NOT UNDER ANY CIRCUMSTANCES WELD A PIECE TO THE MACHINE. YOU
COULD DAMAGE THE MECHANICAL, ELECTRICAL AND ELECTRONIC COMPONENTS.
The distribution network introduces some interferences (micro-powercuts, frequency drifts,
harmonics, interferences etc ... ). These might be detrimental to the correct operation of the system.
So, some electonic components might therefore be submitted to abnormal or excessive voltages and
currents causing their damage beyond repair.
It may be necessary to provide for some adapter elements without galvanic connection to mains
(voltage stablizer, rectifier, converter, transformer, insulation transformer etc ... ). If required the quality
of this electrical power supply should be checked by an approved organization and analysis of the
results should determine the required equipment type.
The following interference must be considered as disturbing for
any
electronic system:
Electrostatic discharges
These are very critical in an environment with relatively low ambient humidity : people or moving
assemblies often create a discharge of several thousand volts by touching a door handle or a metal
upright or, even worse, the chassis. Therefore, it is necessary to provide for an antistatic
environment (anti-static carpet for example).
Transient on mains power supply
Transient are electrical noise pulses propagated along the mains leads which
may
affect system
operation. Their origin may be internal: motor, lift, refrigerator, air conditioning unit, fluorescent tube
or any other machine generating mains noise : or external : stormy weather, neighbouring plant ...
Transient specifications accepted by the system are 50% of the nominal voltage for a maximum
du ration of 5 ms.
Stormy weather
The charges accumulated in stormy conditions result in transient on the mains or on the connecting
cables.
Magnetic fields
A variable magnetic field induces a voltage into a closed circuit creating considerable interference.
Cathode ray tubes are sensitive to magnetic fields. Their sensitivity is materialized by faulty
chromatics of the image or of its geometry. Tl1ese are therefore fitted with a protective shielding.
Medlum- or high-frequency electro-magne!tic radiation
This interference type may be the origin of a large number of problems in the systems (operational
amplifiers, DP memory). Generally, the
ma~Jnitude
of such disturbances depends of the radiation
duration and intensity. They may be due to RADAR installations (near airports for instance) or to
radio frequency transmitters (military, civil, Police, Stations, FM .. ) or even to defective or badly
filtered discharge tubes. Walkie-talkies can pll'Oduce the same effect when used near input channels.
The reference value to be taken into consideration corresponds to an 0.2 to 0.5 VIM field in a
frequency range of 10KHz to 1 GHZ.
3-2/4
INSTALLATION MANUEL
-ed:03/90
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