Monitoring Devices; Operation In An Explosive Atmosphere; Operating Modes - Wilo EMU FA+T Einbau- Und Betriebsanleitung

PRODUCT DESCRIPTION
Motor types with the bearing housing also have a
leakage chamber, which is normally empty. This
accommodates the leakage of the seal on the
motor side.

3.3. Monitoring devices

The monitoring devices vary depending on the
motor size and configuration. For on overview of
the monitoring devices fitted, refer to the order
confirmation as well as the separate technical
data sheet.
All the monitoring devices fitted must always
be connected!
The following monitoring devices are possible for
T series motors:
• Motor/terminal compartment monitoring
The motor/terminal compartment monitoring
signals water ingress into the motor compartment
or terminal board, respectively.
• Thermal motor monitoring:
The thermal motor monitoring protects the motor
winding from overheating. The monitoring sys-
tem used can either be 1-circuit monitoring (limit
only) or 2-circuit monitoring (control and limit).
Bimetallic strips are used for this as standard. The
motors can be equipped with PTC sensors as an
option.
• Sealing chamber monitoring:
The sealing chamber is monitored by a pencil
electrode. This signals if there is water ingress
into the sealing chamber through the mechanical
seal on the fluid side.
• Leakage chamber monitoring:
The leakage chamber is monitored by a float
switch. This reports any water ingress into the
leakage chamber through the mechanical seal on
the motor side.
• Thermal motor bearing monitoring:
The thermal motor bearing monitoring protects
the motor bearings from overheating. Pt100 sen-
sors are used as sensors.

3.4. Operation in an explosive atmosphere

Pumps marked as explosion-protected are suit-
able for operation in an explosive atmosphere.
The pumps must meet certain guidelines for this
type of use. Certain rules of conduct and guide-
lines must be also followed by the operator.
Pumps that have been approved for use in an
explosive atmosphere must be marked as follows
on the rating plate:
• 'Ex' symbol
• Information on Ex classification
For use in an explosive atmosphere, observe the
further specifications in the appendix to this
manual
Installation and operating instructions Wilo-EMU FA + T-Motor
INCORRECT use can result in danger!
When used in an explosive atmosphere, the
pump must have a corresponding approval.
Also, the accessories must be approved for
this application. Check the pump as well as
all accessories before use to verify that they
conform to this directive.

3.5. Operating modes

3.5.1. Operating mode S1 (continuous duty)
The pump can operate continuously at the rated
load without exceeding the permissible tempera-
ture.
3.5.2. Operating mode S2 (short-time duty)
The maximum operating period is specified in
minutes, e.g. S2-15. The pause must last until the
machine temperature no longer differs from the
temperature of the coolant by more than 2 K
3.5.3. "Non-immersed operation" mode
The "Non-immersed operation" mode describes
the possibility of the motor being non-immersed
in a wet well installation during the drainage
pumping sequence and thus permits a lowering of
the water level to the top edge of the hydraulics.
Non-immersed operation is only possible with the
following motors:
T 12, T 13, T 17, T 20.1, T 24, T 30, T 34, T 42,
T 50, T 50.1, T 57, T 63.1
To allow the pump to be operated with a non-
immersed motor, the following must be observed:
• When the motor is non-immersed, note and com-
ply with the operating mode for non-immersed
operation!
• If an operating mode is not documented for non-
immersed operation, the motor must be fitted
with 2-circuit temperature monitoring (tempera-
ture control and limit function):
• An automatic restart can be initiated via the
temperature control function. For this to occur,
the specifications for the maximum switching
frequency and minimum switching break must
be observed!
• When the temperature limit is reached, the unit
must deactivate with restart interlock.
Before the motor can be used in permanent op-
eration again, it must be completely immersed
for at least 1 minute to ensure the necessary
degree of cooling!
• During non-immersed operation, the maximum
fluid temperature and ambient temperature must
not be exceeded. The max. ambient temperature
is equivalent to the fluid temperature.
For the motor T 12, the following applies: Dur-
ing non-immersed operation, the fluid tem-
perature and ambient temperature must not
exceed 30 °C.
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