10
SILVER M
INSTALLATION
– OPERATING - MAINTENANCE
4.8.
Motor protection
Motors are to be protected from overload in accordance with DIN EN
60204 / DIN VDE 0113.
A motor protection switch is prescribed and should be adjusted to
the rated motor current value (see type data plate). A higher value is
not permitted!
Motors with a built in PTC thermostat detector are to be protected
via a PTC thermostat actuation device.
Generally, motors with a rated current up to 3 kW can be switched
on directly (observe performance limitations from the responsible
energy supplier). For larger motors, a star-delta-start or soft-start
is prescribed.
On-site safety precautions are to be taken to prevent overload,
short circuit, over or under current and excessively high ambient
temperatures.
Special care must be taken when connecting motors, especially on
equipment, for which the motors are outfitted with two turning
speed levels. Connections must be made in accordance with the
specifications on the type data plate and the connection plan on the
inside of the motor terminal box.
Protection fuses and automatic circuit breakers are not sufficient for
motor protection. The manufacturer's warranty no longer applies to
damage caused by insufficient motor protection.
4.9.
Electrical connection
All electrical work must be performed exclusively by qualified
specialist personnel with unit power disconnected and protected
against be switched back on.
All electrical connections are to be made in accordance with valid
international, national and local regulations and guidelines, as well
as manufacturer's instructions.
In order to prevent damage, the connection diagram in the terminal
box must be respected.
Watertight sealing must be ensured when making electrical
connections. Connections from below or watertight threaded
connections (minimum protection type IP65) should have a sufficient
cable radius.
All electrical terminal connections (switching cabinet, frequency
converter, motor, etc.) should be checked for secure seating and re-
tightened if necessary (see also DIN 46200).
All electrical cables, which run throughout the housing, must be
affixed and prevented from being damaged.
In order to prevent overheating of the fan heater, the after-run time
of the fan must be observed. This should be adjusted between 6
and 8 minutes, depending on the size.
