Explosion Protection In Accordance With Atex - Wilo -Rexa PRO V06DA-110/EAD1X2-T0015-540-O Einbau- Und Betriebsanleitung

4.2.2 Motor
The motor housing is manufactured in gray cast iron.
In the AC or three-phase current version, dry run
motors are used as the motors. The motor is cooled by
the fluid around it. The waste heat is directly trans-
ferred via the motor housing to the pumped liquid.
Therefore, these units must always be submerged for
continuous operation. The units can be used in inter-
vals when the motor is either submerged or emerged.
When the motor is emerged, continuous opera-
tion is only possible with reduced performance.
Note the information about this in the type code.
With AC motors, the operating capacitor is integrated in
an external capacitor switching device in the connec-
tion cable.
Furthermore, the motors are equipped with the follow-
ing monitoring devices:
• Seal integrity monitor for motor chamber:
The seal integrity monitor reports water penetration in
the motor chamber.
• Thermal motor monitor:
The thermal motor monitor protects the motor winding
from overheating. Bimetal sensors are used for this as
standard. As an option, the motors can be fitted with
PTC sensors.
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 standard connection cable has free cable ends, is
10 m long and longitudinally waterproof.
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.

4.3 Explosion protection in accordance with ATEX

The motors are certified for use in environments where
explosions may occur, in accordance with directive
94/09/EC, and which require electrical devices in device
group II, category 2.
The motors can be used in both zone 1 and zone 2.
These motors may not be used in zone 0!
Non-electrical devices (e.g. hydraulics) also comply
with EC directive 94/09/EC.
Danger of explosion!
The housing of the hydraulics must be fully
flooded (completely filled with the pumped liq-
uid) during operation. If the housing is not sub-
merged and/or there is air in the hydraulics, flying
sparks may cause an explosion e.g. due to static
charge! Ensure that dry-run protection is in place
for switching off.
Installation and operating instructions Wilo-Rexa PRO...
4.3.1 Explosion coding
The II 2G Ex d IIB T4Gb explosion coding on the type
plate indicates the following:
• II = device group
• 2G = device category (2 = suitable for zone 1, G = gas,
vapor, mist)
• Ex = explosion-proof device complying to Euro norm
• d = ignition protection type for motor casing: Pressure-
resistant encapsulation
• II = intended for places where explosions may occur,
with the exception of mines
• B = intended for use with gases in sub-group B (all
gases excluding hydrogen, acetylene, carbon disul-
phide)
• T4 = max. surface temperature of the device is 135 °C
• Gb = device protection level "b"
4.3.2 "Pressure-resistant encapsulation" protection type
Motors with this protection type are equipped with a
temperature control system.
The temperature control system should be con-
nected in such a manner that, if the temperature
limiter is triggered, it can only be switched back
on after the release button has been manually
activated.
4.4 Explosion protection certification number
BVS 11 ATEX E 119 X
4.5 Operating modes
4.5.1 Operating mode "S1" (continuous operation)
The pump can operate continuously at the rated load
without exceeding the maximum permissible tempera-
ture.
4.5.2 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 .
4.5.3 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.
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
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