Motor Protection And Activation Types; Operation With Frequency Converters; Commissioning - Wilo EMU FA+T Einbau- Und Betriebsanleitung

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Fig. 11: Connection diagram of electrode for sealing chamber
control
DK Electrode
Leakage chamber monitoring
• The leakage chamber is monitored by a float
switch. This is equipped with a potential-free
normally closed contact. The switching capac-
ity can be found in the particular connection
diagram.
When the float switch is triggered, a warning
must be given or the unit switched off.
Fig. 12: Leakage floater connection diagram
K20
Leakage chamber float switch
K21
Temperature monitor for motor bearings
• Thermal monitoring of the motor bearings is
performed by Pt100 sensors. These must be con-
nected via an evaluation relay. We recommend the
'DGW 2.01G' relay for this.
The threshold is 100 °C. When the threshold is
reached, the unit must switch off.

5.6. Motor protection and activation types

5.6.1. Motor protection
The minimum requirement for motors with a free
cable end is a thermal relay/motor protection
switch with temperature compensation, differ-
ential triggering and an anti-reactivation device
in accordance with VDE 0660 or the appropriate
national regulations.
If the pump is connected to electrical systems
in which faults frequently occur, we recommend
installing additional protective devices provided
by the customer (overvoltage, undervoltage or
phase failure relays, lightning protection etc.).
We also recommend installing a residual-current
device (RCD).
Local and national regulations must be observed
when connecting the pump.
5.6.2. Activation types
Direct activation
At full load, the motor protection should be set to
the rated current shown on the rating plate.
At partial load, we recommend that the motor
protection be set 5% above the current measured
at the duty point.
The rated current must not be exceeded!
Star-delta activation
The motor protection setting depends on the
installation:
• Motor protection installed in the motor line:
Set the motor protection to 0.58 x the rated
current.
60
• Motor protection installed in the mains supply
cable: Set the motor protection to the rated
current.
The maximum start-up time in star connection is
3 seconds.
Soft start activation
• At full load, the motor protection should be set to
the rated current at the duty point. At partial load,
we recommend that the motor protection be set
5% above the current measured at the duty point.
• The current consumption must be below the
rated current throughout the entire operation.
• Due to the upstream motor protection, starting or
stopping should be completed within 30 seconds.
• To avoid power dissipation during operation,
bypass the electronic starter (soft start) once
normal operation is reached.
Pumps with a plug
At full load, the motor protection should be set
to the rated current shown on the rating plate.
At partial load, we recommend that the motor
protection be set 5% above the current measured
at the duty point.
Plugs are not overflow-proof. Observe the
information on the protection class (IP). The
socket be installed so it is overflow-proof.

5.6.3. Operation with frequency converters

Operation on a frequency converter is possible.
Note the information about this in the appendix.

6. Commissioning

The 'Commissioning' section contains all the im-
portant instructions for the operating personnel
for starting up and operating the pump.
The following conditions must be adhered to and
monitored:
• Type of installation
• Operating mode
• Minimum water submersion/max. immersion
depth
These general conditions must also be checked
after a lengthy period without operation, and
any defects detected must be repaired!
Always keep this manual either by the pump or
in a place specially reserved for it, where it is ac-
cessible for the entire operating personnel at all
times.
In order to prevent damage or serious injury when
commissioning the pump, the following points
must be observed:
• Commissioning of the pump may only be carried
out by qualified and trained personnel in accord-
ance with the safety instructions.
• All persons working on or with the pump must
have received, read and understood this operating
and maintenance manual.
• All safety devices and emergency cut-outs must
be connected and checked to ensure that they
work properly.
COMMISSIONING
WILO SE 07-2015 V05 DIN A4