Operating Modes; Technical Data - Wilo Rexa FIT Serie Manual Del Usuario

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continuous operation. The units can be used in inter-
vals whether the motor is submerged or not.
With AC motors, the operating capacitor is integrated in
the motor.
Furthermore, the motors are equipped with the follow-
ing monitoring devices:
• Thermal motor monitor:
The thermal motor monitor protects the motor winding
from overheating. On units with an AC motor, it is inte-
grated and self-switching. This means that the motor
is switched off when it overheats and automatically
switched back on after it cools down. Bimetal sensors
are used for this as standard.
The motor can also be fitted with an external leak
electrode to monitor the oil separation chamber. It
reports water penetrating the oil separation chamber
through the mechanical shaft seal on the fluid side.
The connection cable is 10 m long and available in the
following versions:
• AC version:
• cable with safety plug
• cable with safety plug and attached float switch
• Three-phase current version:
• free cable end
• cable with CEE plug and attached float switch
4.2.3 Sealing
Sealing to the pumped liquid and to the motor com-
partment is made by two mechanical shaft seals. The
sealing chamber between the mechanical shaft seals is
filled with medicinal white oil.
The sealing chamber is fully filled with white oil when
the product is assembled.
4.2.4 Float switch
The "A" version of the unit is fitted with a float switch.
The float switch is connected directly to the motor.
The float switch makes it possible to set up a level
control system which switches the unit on and off
automatically.

4.3 Operating modes

4.3.1 Operating mode "S1" (continuous operation)
The pump can operate continuously at the rated load
without exceeding the maximum permissible tempera-
ture.
4.3.2 Operating mode "S2" (short-term operation)
The maximum operating period is given in minutes, for
example, S2-15. The pause must continue until the
machine temperature no longer deviates from that of
the coolant by more than 2 K .
4.3.3 Operating mode S3 (interval operation)
This operating mode defines a combination of periods
of operation and standstill. With S3 operation, the val-
ues given are always calculated based on a period of
10 minutes.
32
Examples
• S3 20%
Operation 20% of 10 min ) 2 min/standstill 80% of
10 min = 8 min
• S3 3 min
Operation 3 min/standstill 7 min
If two values are given, they relate to each other e.g.:
• S3 5 min/20 min
Operation 5 min/standstill 15 min
• S3 25%/20 min
Operation 5 min/standstill 15 min

4.4 Technical data

General data
Mains supply [U/f]:
Power consumption [P ]:
1
Rated motor capacity [P ]:
2
Maximum pump head [H]:
Maximum pump flow [Q]:
Activation type [AT]:
Liquid temperature [t]:
Protection class:
Insulation class [Cl.]:
Speed [n]:
Maximum submersion:
Explosion protection:
Operating modes
Submerged [OT ]:
S
Emerged [OT ]:
E
Starts per hour
Recommended:
Maximum:
Free flow diameter
FIT V05-... :
FIT V06-... :
FIT V08-... :
Intake port
FIT...05-... :
FIT...06-... :
FIT...08-... :
Discharge port
FIT...05-... :
FIT...06-... :
FIT...08-... :
see type plate
see type plate
see type plate
see type plate
see type plate
see type plate
3 to 40 °C (37 to 104 °F)
IP 68
F
see type plate
20 m (66 ft)
-
S1
S2 15 min, S3 25%*
20/h
50/h
50 mm (2 in)
65 mm (2.5 in)
80 mm (3 in)
50 Hz: DN 50
60 Hz: ANSI B16.1 125lbs 2
50 Hz: DN 65
60 Hz: ANSI B16.1 125lbs 2.5
50 Hz: DN 80
60 Hz: ANSI B16.1 125lbs 3.0
50 Hz: DN 50
60 Hz: ANSI B16.1 125lbs 2
50 Hz: DN 65/80
60 Hz: ANSI B16.1 125lbs 2.5/3
50 Hz: DN 80
60 Hz: ANSI B16.1 125lbs 3
WILO SE 10/2011 V4.1WE