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4 - SYSTEM START-UP
■ Dual-speed motors: two separate windings, 2 x 3 terminals.
These diagrams apply to three-phase, 1500/1000 rpm motors.
These wiring diagrams are inside each terminal box.
Retighten the connections after 48 hours of operation.
■ Frequency inverters
Recommendations:
- The motor must be connected to the inverter using a
shielded cable;
- The sizing of the inverter depends on the distance
between the motor and the inverter;
- Before starting up the system, the upper frequency must
be limited to prevent the maximum speed of the rotating
parts from being exceeded or the motor from being
overloaded;
- Eliminate the frequencies producing resonances by
checking the operation of the fan one frequency at a
time.
- Fit Du/Dt filters on the inverter side for the 690V
networks.
18
Low
speed
(LS)
High
Speed
(HS)
LS and HS for "2" contacts
4.2 - Blade damper
Do not turn on the fan with the blades closed.
When the unit is shut down, ensure a time delay on the dampers
(or a leakage rate) equal to the fan's inertia time or the time
required for the heat to be evacuated from the electric heater.
4.3 - Electric heater
IMPORTANT: Never operate the coil with the fan off.
IMPORTANT: Always install a fan delay.
4.4 - Water humidifier
Check the direction of rotation of the pump.
Refer to the documentation delivered with the pump.
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