Electrical Connection
CAIR
plus
52
PR-2009-0096-GB • Subject to modifications • R8-10/2015
7.2.2 Connecting electric motors
For proper unit operation consider the
clockwise rotating field
for unit connection.
•
If necessary, check the rotating field using an instrument specifically designed for
this purpose.
The terminals of AC motors are labelled in such a way that the
alphabetical
sequence
of the terminal designation U1, V1, W1 corresponds with the
temporal
sequence of the
phases L1, L2, L3 (with clockwise rotation).
The rotation direction can be reversed by exchanging two connecting wires:
Single-speed electric motors
with direct start:
– Exchange the connecting cables, e.g. U1 and V1
Single-speed electric motors
with Y/
Δ
-start:
– Y-switch: exchange the connecting wires, e.g. U1 and V1
–
Δ
-switch: exchange the connecting wires, e.g. U2 and V2
Voltage fluctuations
•
Ensure that the supply voltage at mains frequency falls within the range from 95%
to 105% of the rated voltage. If this condition is met, motors can deliver the rated
capacity, otherwise non-compliance can result in equipment damage.
To carry out the connection, proceed as follows:
•
Connect the unit according to the wiring diagrams.
Single-stage motor: 1500 min
-1
, with voltage change-over
Motor version:
•
to 2.2 kW: 3 x 230 V with
Δ
-type switch,
3 x 400 V with Y-type switch
•
from 3 kW: 3 x 400 V with
Δ
-type switch,
3 x 690 V with Y-type switch
2 - 3 PTC thermistors depending on the motor size
Total resistance R
K
(20 °C) approx. 200 - 300
Ω
*1 PTC thermistor
*2 Motor protection device
Fig. 7-1
ATTENTION
Risk of damage to the unit!
Improper connection to the motor/fan could result in equipment damage.
•
Check for the proper assignment of the phase sequence to the specified rotating
direction
before the motor is connected
.
Notice!
•
Please observe the name plate of the motor (Y/delta switch)!
K
K
W2
U2
V2
U1
V1
W1
L2
L1
L3
W2
U2
V2
U1
V1
W1
L2
L1
L3
L1
U1
W2
L2
L3
V1
V2
U2
W1
L1
U1
W2
L2
L3
V1
V2
U2
W1
*2
*1
