TCF Termoventilatori Condizionatori Felsinea Srl
40057 Cadriano di Granarolo Emilia (Bologna), via Giuseppe di Vittorio 5
www.tcf.it
7
This arrangement reduces the starting current by
approximately 30% of the current involved in case of direct
starting.
FIG. 16
4.5.1.3
Dual speed three-phase motors
The diagram in fig. 17 shows the connection of a TWO-SPEED
MOTOR with two separate windings to the power supply.
TCF installs motors of this kind on the following units:
-
230/400V for power ratings up to 5,5kW
-
400/690V for power ratings from 7,5kW
This type of electric motor permits the delta-star connection
by means of a starter.
The two-speed motors with a single DAHLANDER
commutable winding (fig. 18) offer the advantage of
generating greater power than motors of the same size but
with separate windings.
4.5.1.4
Permitted start-up time
Because of the temperature increase, the start-up time of a
motor may not exceed the value shown in table 1.
The data refer to start-ups at exercise temperature, whereas
for cold start-ups such timings may be doubled.
4.5.1.5
Recommended
connection
and
protection
accessories
For the sizing of cables and connections, please refer to the
motor nameplate data and to the laws in force in the country
where the unit is installed.
FIG. 17
FIG.18
4.5.2
Fan
Before start-up, carry out the following checks:
-
make sure that the fan wheel is functioning
correctly by rotating it manually
-
check that any safety clamp, fitted to prevent
damage during transportation, has been removed
from the dampers (fig. 19).