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Siemens Building Technologies SED2 variable speed drives CM1U5192en
HVAC Products Electrical installation 01.2002
4.3.10 Star or delta connection
The required supply voltage and method of connection are indicated on the motor
rating plate. In general, larger motors (400/690 V) are connected in a delta
configuration and smaller motors (230/400 V) in a star configuration.
U
1
V
1
W
1
W
2
U
2
V
2
U
1
V
1
W
1
W
2
U
2
V
2
Motor terminal board
5192Z30en
4.3.11 Connecting several motors
You can use the SED2 to control several motors in parallel. Make sure, however, that
all motors have the same rating. When multiple motors are connected, the motors
connected in parallel cannot be operated individually.
When determining the required power, remember to take account of the total current
from all the motors, i.e., the sum total of all ratings.
Note the recommended length of the motor connection cable. The sum of all
connection cables represents the total cable length.
SED2
M
1
M
2
M
3
M
4
M
n
5192Z10
å I
M
1
..M
n
≤ I
SED2,max.
å P
M
1
..M
n
≤ P
SED2,max.
4.3.12 External motor overload protection
14
15
SED2
Control
terminals
5192Z11en
During operation below nominal speed, the
cooling effect of the fans fitted to the motor
shaft is reduced. For this reason, most
motors require de-rating if operated
continuously at low frequencies. To ensure
that motors are protected from overheating
under these conditions, mount a PTC
temperature sensor to the motor and
connect it to the control terminals of the
variable speed drive.
To activate the switch-off function, set parameter P0601 to 1.
Important
Note
.
..
.
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