13
Attention: In the fan sections equipped with more than one fan (SVS 70-100) synchronous
operation of fans should be ensured.
The fan control system should be prepared in such a way so as to provide simultaneous start-
up, rotary speed control and stoppage.
In case of a breakdown and stoppage of one fan, the entire fan set does not fulfill its function
and should be disabled.
In case of powering the motor from a frequency converter, high-frequency currents or voltage harmonic
components in wiring powering the motor can generate some electromagnetic interferences. The connection
between the frequency converter and motor should be using shielded cables, in accordance with guidelines
outlined in the operation and maintenance manual of the frequency converter.
Before putting the device into service and after long time of storage or standstill, the resistance of insulation
between the casing and winding should be determined, by applying the direct current.
Minimal value of insulation resistance
for a new, renewed or repaired winding should be
10
MΩ
in relation to
the ground.
Fig.12a. Connecting diagram of the AC motor in SVS 35-50
(1)
– without frequency converter
2)
– with frequency converter
