Zenit pumpBOX GR 75 S Manual De Instalación página 22

BOX - Translation of the original instructions
pump
5. ELECTRICAL CONNECTIONS
All mains connection operations must be carried out by qualified personnel in compliance with the regulations in force.
Incorrect electrical connections can lead to fire, risk of electrocution and damage to the product.
Before making connections, ensure that the power supply has been disconnected and cannot be accidentally restored.
5.1 Warnings
• The power consumption of the pump must be less than the maximum current that the system can deliver.
• To ensure safe conditions, the pump must be powered by an earth leakage circuit breaker with a maximum threshold current of 30mA.
• The lifting station must be permanently connected to the electrical system.
• The electrical installation must have a switch which ensures the omnipolar disconnection of the pump from the power supply. The switch
must be directly connected to the power supply terminals and must have contact separation at all poles, allowing complete disconnec-
tion under the conditions of overvoltage category III (4000V).
• The pump motor must be protected against overload by means of a current protection (motor protection switch) installed in the main
control circuit or in the pump supply line. The overload protection must be dimensioned according to the rated data of the pump. Please
note that the inrush current with direct start-up can be up to six times higher than the rated current.
• Permissible voltage variation from the rated value: max ± 5%
EN
• Permissible voltage unbalance between phases: max. 2%
• Fuses and circuit breakers must be sized according to the system characteristics.
• In order to protect the pump motor, use a motor protector suitable to the electrical characteristics indicated on the nameplate.
• Make sure that the thermal protection, if present, is correctly connected: failure to connect the thermal protection not only invalidates
the warranty, but can also be dangerous.
• The functionality and electrical safety of the ZENIT pumps are guaranteed for the configuration supplied by the factory. Any modification
(e.g.: adding a piece of cable to the original one) may cause the pump characteristics to deteriorate.
5.2 Cables
• Make surethat the electrical cables are not damaged and that the ends have not been in contact with moisture and/or immersed in water.
• Secure the electric cables so that they cannot be twisted, torn and/or crushed.
• If the cable is damaged, do not replace it but contact Zenit or an authorised service centre.
• Do not underestimate problems related to voltage drop.
5.3 Earthing
• Make surethat there is an efficient earthing system and earth leakage circuit breaker present.
• Leave the earth conductor approximately 150 mm longer than the other conductors so that it is the last to disconnect from the panel in the event
of an accidental pull-out.
Do not connect the earth cable to gas pipes, water pipes, lightning conductors or telephone cables.
Improper earthing can cause electrocution.
5.4 Thermal protection
The pump is equipped with a thermal protection which cuts off the power supply if the motor overheats. When the motor has cooled down, power
is automatically restored.
As standard, the thermal protection consists of bimetal sensors built into the stator (one for each phase, connected in series).
The thermal protection cables are labelled with the initials "TP" (THERMAL PROTECTION).
5.5 Infiltration probe (only for pumpBOX DG)
A single-signal dual probemay be installed inside the pump to detect the presence of water or moisture in the oil chamber of the mechanical seals
and in the motor.
The infiltration probe is of the single-electrode type and uses the earth conductor (PE) to close the detection circuit.
The seepage probe cable is marked with a label bearing the letter S.
The detection device must be contained within the electrical control panel and supplied via an isolating transformer.
In the event of signalling, remove the lifting station from service and carry out maintenance work.
5.6 Electrical control panel
The electrical control panel must be located in a dry place, at a safe height in case of flooding.
It must be type-approved and have a degree of insulation suitable for the environment in which it is installed.
ZENIT can supply a suitable electrical control panel for connecting the pump and control systems.
This allows the liquid levels inside the tank to be read in order to control pump start-up and stop.
In models with 2 pumps, the electrical control panel must be programmed to allow the pumps to run alternately. This
way, the second pump will start in order to assist the first in the event that the it becomes blocked or unable to empty the
incoming wastewater, ensuring greater reliability.
5.6.1 Recommended electrical control panels (not included)
Model
Q1EL M 0.37-2.2 KW - 2-16A - AS/AV
Q1EL T 0.55-7.5 KW - 2-15A - AS/AV
Q2EL M 0.37-2.2 KW - 2-16A - AS/AV
Q2EL T 0.55-7.5 KW - 2-15A - AS/AV
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Electronic control panel with self-learning for direct starting of single- and three-phase pumps,
amperometric protection against dry run operation by cos φ and minimum current.
For installation and use, please refer to the relative manual.
Description
better together