16-11-2012, 02:14 PM
Motor Protection
Motor.pdf (Size: 3.65 MB / Downloads: 330)
RECEPTION OF THE PRODUCT
Reception of the relay
Protection relays are generally robust. However it is appropriate to treat them with
care before installing them on site. As soon as they arrive, the relays should be
examined immediately, looking for any deterioration which could have occurred
during transport. If there is any deterioration, make a claim against the forwarding
company and inform Schneider Electric as soon as possible.
Relays not intended for immediate installation must be stored in their protective
polyethylene packaging.
Electrostatic discharge (ESD)
Relays use components sensitive to electrostatic discharges. The electronic circuits are
well protected by the metal housing. Consequently, the internal module must not be
taken out pointlessly. When handling the module outside its housing, be very careful
to avoid any contact with electrical connections and components. If it is removed
from its housing for storage, the module must be placed in electrically conductive
antistatic packaging.
No configuration setting is possible in the module. We therefore advise you not to
dismantle it pointlessly. The printed circuit boards are interconnected. They are not
designed for disconnection by the user. Avoid touching the printed circuit boards.
They are made with complementary metal-oxide semiconductors (CMOS) and the
static electricity discharged by the human body has an adverse effect on them.
HANDLING ELECTRONIC EQUIPMENT
The usual movements of a person easily generate electrostatic energy which may
reach several thousand volts. The discharging of this voltage into devices comprising
semiconductors, when handling electronic circuits, can cause severe deterioration.
Such damage is not necessarily visible immediately. Nevertheless, it reduces the
reliability of the circuit.
Electronic circuits are completely protected against any electrostatic discharge when
inside their housing. Do not expose them to any risk by needlessly taking the
modules out of their housings.
Each module has the best possible protection for its devices consisting of
semiconductors. However, should it be necessary to withdraw the module from its
housing, please take the following precautions to preserve the great reliability and
long service life for which the equipment was designed and manufactured.
INSTALLING THE RELAYS
The relays are supplied either individually or mounted in a cubicle. If separate relays
have to be installed according to a particular drawing, please follow the mounting
details indicated in publication R7012. If a MMLG test unit has to be incorporated,
position it to the right of the set of relays (looking at them from the front). The
modules must still be protected in their metal housings during installation on a
cubicle. The design of the relays makes it possible to reach the mounting holes easily
without taking off the cover. For individually mounted relays, a positioning diagram
is normally supplied to indicate the centre of the holes and the layout of the cubicle.
The corresponding dimensions are also indicated in the corresponding sales
publication (N 1550-B).
UNPACKING
When unpacking and installing relays, take great care to avoid damaging the parts
and changing the settings. Relays must be handled only by people who are experts
in this field. As far as possible, the installation must remain clean, dry, free from dust
and free from excessive vibration. The site must be well lit to facilitate inspection.
Relays removed from their housings must not be exposed to dust or humidity. To this
end, it is necessary to take great care when installing relays whilst construction work is
taking place on the same site.
STORAGE
If the relays do not have to be installed immediately on reception, they must be stored
protected against dust and humidity in their original carton. If dehumidifying crystals
are placed in the relay packaging, it is advisable not to remove them. The effect of
the dehumidifying crystals is reduced if the packaging is exposed to ambient
conditions. To restore their original effectiveness, you need only to heat the crystals
slightly for around an hour, before replacing them in their delivery carton.
As soon as the packaging is opened, the dust which has accumulated on the carton
risks settling on the relays. In the presence of moisture, the carton and the packaging
can become humidified to the point where the effectiveness of the dehumidifying
crystals is reduced.