VTS VENTUS PRO PVS 31x31 [15/34] Reset way

OIMM – VENTUS PRO

! Before connecting the fan set one should check carefully the rated parameters of both power

supply and the converter’s output.

! In fan sections equipped with more than one fan 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 fan set does not full its function and

should be disabled.

! In the inspection door of the fan section is installed limit switch, which cause the fan to stop

in case of unauthorized opening of the door. The switch must be connected to the frequency

converter, accordance with the wiring diagram attached in the VFD separate manual.

! Fan motors with the power of 4kW can be started directly. Motors with the power of 5.5 kW and

more should be started in a ‚star - triangle’ start-up system.

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. Connection

between the frequency converter and motor should be done using shielded cables, in accordance with guidelines

outlined in the operation and maintenance manual of the frequency converter.

Before putting into service and after long time of storage or standstill, the resistance of insulation between

the casing and winding should be determined, applying direct current. Minimal value of insulation resistance

for a new, renewed or repaired winding should be 10 MΩ in relation to the ground.

Fans' motors with belt drive are powered by 3x400V/50Hz voltage. The connection should be done through the

overload and short-circuit protection suitable for rated current of the motor.

Electric motor, starters, interconnecting cabling and any associated controls should be properly designed and

selected to be suitable for the driven equipment or other electrical apparatus, to be safe and to comply with the

requirements of Electricity Supply Authority.

Starter for centrifugal fans in the air handling units for single speed motors driving through V-belts are normally

of the direct-on-line type. However, the customer or Electric Supply Authority may require motors above 3kW to

be operated by a star-delta starter, to reduce starting current.

 TYPICAL CONNECTIONS – INTERMEDIATE FAN DRIVE (AC MOTORS)

 Reset way

To avoid the electric heater keep on running

while the fan is not rotating, the wiring should

be done similar to diagram shown at the right

A – manual reset

B – automatic reset