Wilo -Atmos BST Instrucciones De Instalación Y Funcionamiento página 46

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Fig. 5: Alternating current
Fig. 6: Y-Δ-connection
46
DANGER
Risk of fatal electrical shock!
Immediate danger of death if live components are touched!
• Check whether all connections are voltage-free!
• Main fuse: depending on the rated motor current.
• Earth the pump according to the instructions.
• Lay the connection cables so that they do not touch the piping or the pump or motor
housing.
NOTICE
The connection diagram for the electrical connection is located in the
terminal box.
The special motor model is fitted with passive thermal control. This thermal control can be
connected via the corresponding terminals in the terminal box.
The passive thermal control should always be connected to the thermal trip mechanism!
CAUTION
Risk of material damage!
Only a max. voltage of 7.5 V DC may be applied to the terminals of the
passive thermal control. A higher voltage will destroy the PTC thermistor
sensor.
• It is advisable to install a motor protection switch.
Setting the motor protection switch:
• Direct starting current: The information on the motor rating plate pertaining to the rated
current must be observed for the installation.
• Y-Δ start: If the motor protection switch is switched in the supply line to a Y-Δ contactor
combination, adjust the switch as for direct starting. If the motor protection switch is
switched in a thread of the motor supply line (U1/V1/W1 or U2/V2/W2), set the motor
protection switch to the value 0.58 x rated motor current.
• The mains connection depends on the motor power P
Refer to the following table and Fig. 4 and Fig. 5 for the required connection of the con-
necting bridges in the terminal box.
Activation type Motor power
P ≤ 3 kW
2
Mains voltage
3∼ 230 V
Direct Δ-connection
(Fig. 5)
Y-Δ start Remove con-
nection bridges.
Fig. 5 (Y)
Table 6: Terminal assignment
• When connecting automatic switchgears, observe the corresponding installation and op-
erating instructions.
• For three-phase current motors with Y-Δ connection, be sure that the switchover points
between star and delta are very close together in time. Longer switchover times can lead
to pump damage.
Recommended time setting for Y-Δ activation:
Motor power
≤ 30 kW
Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
, mains voltage and activation type.
2
Motor power
P > 3 kW
2
Mains voltage Mains voltage
3∼ 400 V 3∼ 380 V
Y-connection Δ-connection
(Fig. 5) (Fig. 5)
Not possible Remove con-
nection bridges.
Fig. 5 (Y)
Time to be set
< 3 seconds
Motor power
P < 2.2 kW
2
Mains voltage
1∼ 230 V
Connection
(Fig. 4)