Wilo CronoLine IL 250 Series, Installation And Operating Instructions Manual

Page: 19 / 34

English
Installation and operating instructions Wilo-CronoLine IL 250... 35
• Check the current type and voltage of the mains connection.
• Observe the type plate information for the pump. The current type
and voltage of the mains connection must correspond to the specifi-
cations on the name plate.
• Mains-side fuse protection: dependent on nominal motor current.
• Observe earthing.
• The connection diagram for the electrical connection is in the termi-
nal box (also see Fig. 35/36).
• Secure the motor against overloading with a motor-protective cir-
cuit-breaker or by the PTC thermistor tripping unit. The use of
a motor-protective circuit-breaker is recommended.
Setting the motor-protective circuit-breaker:
• Y- Δ start: If the motor protection switch is switched in the supply line
to a Y- Δ contactor combination, set the switch as for direct starting
(setting to the motor nominal current of the motor rating plate).
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 0.58 x nominal motor current.
• The special motor design is equipped with PTC thermistor sensors.
Connect the PTC thermistor sensors to the PTC thermistor tripping
unit.
CAUTION! Risk of damage to property!
Danger of damage due to incorrect handling.
• Only a maximum voltage of 7.5 V DC may be applied to the termi-
nal. a higher voltage will destroy the PTC thermistor sensor.
The mains connection to the terminal board is dependent on the rated
power PN, the mains voltage and the start-up type.
Required connection of the connecting bridges in the terminal box:
• When connecting automatic switchgears, observe the relevant instal-
lation and operating instructions.
• For three phase motors with Y- Δ connection, be sure that the switch-
over points between star and triangle are very close together in time.
Longer switch-over times can lead to pump damage.
Recommendation for setting the times for Y- Δ activation:
CAUTION! Risk of damage to property!
Danger of damage due to incorrect handling.
• Only carry out the rotation direction monitoring after the system is
filled. Even brief dry running will destroy the mechanical seal.
Fig. 35: Y- Δ -start (standard)
L1 L2 L3
W2 U2 V2
U1 V1 W1
PTC
Fig. 36: Δ connection
W2 U2 V2
U1 V1 W1
PTC
Activation type Mains voltage 3~400 V
Y- Δ start
(default)
Remove connecting bridges
(Fig. 35)
Start via
Soft starter
Δ connection (Fig. 36)
Motor power Y time to be set
> 30 kW < 5 seconds