Start-up
Operating_Manual_Fan_KXE_04_en.docx
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Example 1:
Fan speed 1500 rpm
When powering up from a standstill, the ramp time of
75 seconds may not be fallen short of.
Example 2:
Change of operating point from 3000 rpm to 2000 rpm
Allow 50 seconds time for this speed change.
WARNING
Motor and additional components of the power train!
Damage to the motor and to additional components of the
power train as a result of continuous regulation within short
periods of time.
→ The fan should then only be switched on again when
the impeller has come to a standstill.
→ Allow sufficient time for after-run of the fan until a
standstill is attained.
Regard the boundary conditions (e.g. mass moment of
inertia for the impeller, acceleration torque of motor, power
consumption, regulation of the plant) in accordance with
respective utilisation of the fan.
Natural frequency of the fan:
The fan can be operated with constant nominal speed;
natural frequencies are not anticipated with this speed.
For speeds which deviate from the nominal speed, natural
frequencies can occur. Block critical speeds or speed ranges
for continuous operation. When powering up and powering
down the fan, accelerate quickly through these critical
speeds.
