Denco CAIRplus Operation Manual page 52

Electrical Connection
7.2.2 Connecting electric motors
Single-speed electric motors
with direct start:
Single-speed electric motors
Δ
with Y/ -start:
Voltage fluctuations
L1
U1
U2
V2
W2
V1
W1
L3
L2
L1
W2
U1
W1
U2
L2
L3
V1
V2
Fig. 7-1
52
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.
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.
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:
– Exchange the connecting cables, e.g. U1 and V1
– Y-switch: exchange the connecting wires, e.g. U1 and V1
Δ
– -switch: exchange the connecting wires, e.g. U2 and V2
•
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
Notice!
•
Please observe the name plate of the motor
W2
U2 V2
V1 W1
U1
L2
L1 L3
W2 U2 V2
U1 V1 W1
L1 L2 L3
ATTENTION
-1
, with voltage change-over
Motor version:
•
*1
to 2.2 kW: 3 x 230 V with
3 x 400 V with Y-type switch
•
from 3 kW: 3 x 400 V with
3 x 690 V with Y-type switch
2 - 3 PTC thermistors depending on the motor size
Total resistance R
*1 PTC thermistor
*2 Motor protection device
K K
*2
PR-2009-0096-GB • Subject to modifications • R8-10/2015
(Y/delta switch)!
Δ
-type switch,
Δ
-type switch,
(20 °C) approx. 200 - 300
K
CAIRplus
Ω