Wiring; Ground Connection; Thermal Protection; Water Sensor - motralec UNIQA M08S Manual De Primera Instalación

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First installation manual – Translation of original instructions
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Voltage imbalance between phases: max 2%
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The fuses and protective cut-outs must be of suitable rating for the system's characteristics.
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Protect the pump motor using an overload cut-out suitable for the electrical data provided on the nameplate.
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Make sure that the thermal protection devices are properly connected: apart from leading to forfeiture of warranty cover, failure to connect the
thermal protection may constitute a hazard.
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The electrical operation and safety of ZENIT electric pumps are guaranteed for the configuration supplied by the manufacturer: any changes
(e.g. addition of extra lengths of cable to the original power lead) may cause a deterioration in the pump's characteristics.

4.1.1 Wiring

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Make sure that the electrical cables are not damaged in any way and the ends have not be exposed to damp and/or immersed in water.
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The cable's free terminals must be connected to a regulation control panel with a degree of insulation suitable for the installation environment.
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Secure the electric cables so that they cannot be twisted, torn and/or crushed.
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If the cable is damaged, do not replace it; contact Zenit or an Authorised Service Centre.
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Do not underestimate the problems caused by voltage drops.
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In case of use with a variable frequency drive, use screened cables compliant with the relevant regulations.
The ends of the power supply cable must be connected to an electric panel certified for use in potentially explosive atmospheres
if it is installed in a hazardous area
EN

4.1.2 Ground connection

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Make sure that the ground system and differential security breaker are present and in good working order.
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Check that the ground conductor is about 150 mm longer than the other conductors so that it will be the last to become disconnected from the
panel in the event of accidental tugs.

4.1.3 Thermal protection

The standard thermal protection consists of bimetal thermal sensors integral in the stator.
It protects the motor from overheating and resets automatically once the motor has cooled down.
PTC thermostats can be used as an optional.
The thermal protection cables are marked with a label stating "PROTEZIONE TERMICA - THERMAL PROTECTION" and must be connected to
the corresponding terminals of the control panel.
The electrical panel must be set in a way to avoid the automatic restart of the submersible pump. The pump has to be exclusively restarted ma-
nually by a technician after having fixed the causes of the anomaly.
Apart from leading to forfeiture of warranty cover, failure to connect the thermal protection may constitute a hazard.
For installations with ATEX-certified models, the electric panel must be predisposed to guarantee the shutdown of the motor
when the thermal protection intervenes and to avoid the automatic start-up of the pump which must only be started manually with
the intervention of an operator.

4.1.4 Water sensor

The standard electric pump is equipped with a single-signal dual probe (Fig. 10 page 69) that can detect the presence of water or humidity in the
oil chamber of the mechanical seals and in the motor.
The water sensor is of single electrode type and uses the ground conductor to close the circuit; the circuit must be supplied with power by means
of an insulating transformer.
The cable is marked with a label with the letter "S" and must be connected to the corresponding terminal of the control panel.
On request, the electric pump can be equipped with single probes for the detection of water or humidity inside the oil chamber of the mechanical
seals (S1), the motor compartment (S2) and the terminal board compartment (S3) (Fig. 11 page 69).
For installations with ATEX-certified models, the connection to the electric control panel must be carried out by inserting an
Intrinsic Safety interface such as the Zener safety barrier or the galvanic isolation barrier. In the case of a warning, proceed with
maintenance.

4.2 Connection diagrams (standard version)

To set up the electrical connection of the electric pump, do the following:
1. Check which type of electrical connection is required on the identification plate (direct starting or Y/D).
2. Firstly, connect the earth wire to the relative terminal in the electrical panel, according to the connection diagram illustrated in Fig. 21 A/B/C/D
page 74.
3. Connect the power wires to the relative terminals in the electrical panel, according to the connection diagram illustrated in Fig. 21 A/B/C/D page 74.
4. Connect the wires of the control devices to the terminals on the relative panel.

4.3 Non-standard electrical connections to sensors and protective devices

Please refer to the specific documentation supplied with the unit.
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