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Dual-speed motors: two separate windings, 2 x 3 terminals.
These diagrams apply to three-phase, 1500/1000 rpm motors.
Low
speed
(LS)
High
Speed
(HS)
LS and HS for “2” contacts
These wiring diagrams are inside each terminal box.
Retighten the connections after 48 hours of operation.
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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.
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.
4 - SYSTEM START-UP
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