Anti-Condensation Heater - Wilo Atmos GIGA-I Einbau- Und Betriebsanleitung

W2 U2
PTC
U1 V1
L1 L2
Fig. 5: Y-Δ start
W2 U2
PTC
U1 V1
Fig. 6: Δ connection
8.1

Anti-condensation heater

Installation and operating instructions Wilo-Atmos GIGA-I/-B
Electrical connection
NOTICE
The connection diagram for electrical connections is in the terminal box cover.
Setting the motor protection switch:
ƒ
Set according to the rated motor current specified on the rating plate of the motor.
V2
Y-Δ starting: 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/
W1
V1/W1 or U2/V2/W2), set the motor protection switch to the value 0.58 x rated
motor current.
L3
ƒ
Connect the PTC thermistor sensors to the PTC thermistor tripping unit.
CAUTION
Risk of property damage!
Only a maximum voltage of 7.5 V DC may be applied to the PTC thermistor sensor
terminals. A higher voltage will destroy the PTC thermistor sensor.
ƒ
The mains connection is dependent on the motor power P2, mains voltage and ac-
tivation type. Refer to the following table and Fig. 5 and Fig. 6 for the required
connection of the connecting bridges in the terminal box.
V2
W1
Activation type
Y-Δ-start (standard)
Start via soft starter
Table 4: Terminal assignment
ƒ
When connecting automatic switchgears, observe the corresponding installation
and operating instructions.
ƒ
For three-phase current 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.
Recommended setting the times for Y-Δ activation:
Motor power
> 30 kW
CAUTION
Even brief dry running will destroy the mechanical seal!
Only carry out the direction of rotation monitoring after the system is filled!
NOTICE
Use of soft starters is recommended to limit the starting current and preventing
tripping of excess current protection devices.
We recommend an anti-condensation heater for motors which, due to climatic condi-
tions, are at risk of condensation. These are, for example, idle motors in humid environ-
ments or motors that are exposed to large temperature fluctuations. Motors equipped
with an anti-condensation heater at the factory can be ordered as special versions. The
anti-condensation heater is used to protect the motor windings against condensation
water inside the motor.
ƒ
The anti-condensation heater is connected to the terminals HE/HE in the terminal
box (connection voltage: 1~230 V/50 Hz).
Mains voltage 3∼ 400 V
Remove connecting bridges (Fig. 5).
Δ-connection (Fig. 6)
Time to be set
< 5 seconds
en
59