2.3
Electrical connection
DANGER
A)
The system voltage and frequency must be the same as stated on the
stamp plate. ±5% voltage and ±2% frequency deviations from the rated
values are permitted without the necessity of derating the output. The
joints should be arrange and connected according to the circuit diagram in
the terminal box. The protective earth conductor should be connected to
the
terminal
CAUTION
B)
The rated motor current applies for +40ºC air inlet and ambient
temperatures. However at temperatures of +25ºC a 6% higher motor
current is permissible.
C)
Select motor circuit-breakers to match the rated motor current. Where
frequency drives are used as power supply, high frequency current and
voltage harmonics in the motor cables can cause electromagnetic
interference. Therefore shielded motor cables are recommended.
D)
Exceeding the operating speed (see stamp plate) worsens performance
with respect to noise and vibration, and also shortens the life of bearing
grease and the bearing replacement interval. To prevent damage arising
from excessive speeds, it is advisable to consult the supplier concerning
speed limits. Generally rule is approx. 65Hz maximum.
The electric power must be disconnected before
any work is performed on the equipment.
High surface temperatures of more than 70ºC can
occur at the blower. No heat-sensitive parts, such as
standard cables or electronic components, must be
attached or make contact to the surface. If
necessary, protection measures must be provided!
