Operation With Frequency Converters; Minimum Requirements For The Switchgear; Commissioning/Operation - Wilo EMUport CORE Manual De Instrucciones

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Prior to the connection, the insulation resistance
of the motor windings and of the monitoring
equipment must be checked. If the values meas-
ured deviate from the specifications, moisture
may have penetrated the equipment or the mon-
itoring unit may be defective. Do not connect the
pump and consult Wilo customer service.
Checking the insulation resistance of the motor
winding
Use an ohmmeter to check the insulation resist-
ance (measuring voltage = 1000 V). The following
values must be complied with:
• At the time of initial commissioning: insulation
resistance may not be less than 20 MΩ.
• For further measurements: value must be
greater than 2 MΩ.
Checking the temperature sensor of the motor
winding
Use an ohmmeter to check the temperature sen-
sor. The following values must be complied with:
• Bimetallic strip: Value = "0" passage
• PTC thermistor sensor: A PTC thermistor sensor
has a cold resistance of between 20 and 100 Ω.
If there are three sensors in series, this results
in a value of 60 to 300 Ω.
If there are four sensors in series, this results in
a value of 80 to 400 Ω.
Checking the moisture sensor in the motor
compartment
Use an ohmmeter to check the moisture sensor.
The following value must be observed:
• This value must approach "infinity". If the value
is low, there is water in the motor compart-
ment.
5.4.4. Connecting the level control device
The level sensor that has been installed must
be connected to the respective terminals of the
switchgear used. Switching points must be stored
in the switchgear in accordance with the data
sheet provided with the switchgear:
• Pump ON
• Pump OFF
• High water alarm
The specified switching points may only be
changed after consulting the manufacturer!
Observe the installation and operating instruc-
tions for the respective switchgear!
DANGER – explosive atmosphere!
An explosive atmosphere can form within
the collection reservoir. A spark could lead to
fatal injury due to explosion! The connection
of the level sensor must be made using an
intrinsically safe electric circuit (e.g. Zener
barrier). Observe in this connection local stat-
utory requirements.

5.4.5. Operation with frequency converters

Operation on the frequency converter is not
possible.
44

COMMISSIONING/OPERATION

5.5. Minimum requirements for the switchgear

To ensure safe operation of the sewage lifting
unit, the switchgear must provide the following
functions and connections.
5.5.1. Functions
• Control of two pumps in alternating operation
with forced switching.
Parallel operation is to be prohibited on the
hardware-side and software-side!
• Single-pump operation
During maintenance, the lifting unit can be op-
erated with just one pump. The respective pump
must be selected to this end and operated in
accordance with the specified operating mode!
• Configurable overload protection
• Rotation direction monitoring
• Adjustable measurement range for different level
sensors
• Main switch
• Manual control of the pumps
The pumps may not be switched on unless the
"Pump ON" level in the collection reservoir has
been achieved.
• Alarm signal for high water level
An alarm signal must take place when the high
water level is reached.
5.5.2. Connections
• Per pump:
• Power connection in direct or star-delta activa-
tion, dependent on the pump
• Winding temperature monitoring with bimetal-
lic strip
• Moisture probe for the motor compartment
monitor
• Moisture probe for sealing chamber control
(dependent on the system configuration)
• Signal transmitter for the level control device
• Level sensor
• Intrinsically safe electric circuit (dependent on
local statutory requirements!)
6. Commissioning/operation
The "Commissioning/operation" section con-
tains all the important instructions for operating
personnel on commissioning and operating the
lifting unit safely.
The following general conditions must always be
met and checked:
• Max. intake/h
• All of the connections are tight, no leakage
emerges
• Vent is connected and functioning perfectly
These general conditions must also be checked
after a lengthy period of standstill, and any
defects detected must be remedied!
Always keep this manual either by the lifting unit
or in a place specially reserved for it, where it is
accessible for all operating personnel at all times.
WILO SE 03-2017 V06 DIN A4