Electrical Connections; Emptying The Pump - E-Tech EH 3 Betriebs- Und Installationshandbuch

ENGLISH
Translation of the original instructions
inspection and maintenance.
• Install a check valve (Fig. 5-5) to the discharge piping to prevent reflux and water
hammer when the pump is switched off.
• See (Fig. 6) for the sizes of the pump's threaded connections.
WARNING: Depending on the temperature of the pumped liquid, the
surfaces of the electric pump can become very hot. If deemed necessary,
provide guards to avoid accidental contact.

5.4.2 Electrical connections

WARNING: Low voltage machines are made up of rotating, hazardous, live
parts and also sometimes of hot surfaces.
WARNING:
• The specialist installer must carry out the connection conform to
standards in force in the country of installation.
• Before doing any work on the unit make sure the power supply is
disconnected and that neither the control panel nor the unit can switch
on, not even accidentally.
WARNING:
• Ensure all electrical equipment of the pump, motor and any monitoring
equipment is grounded before connecting the phase conductors.
• The earth conductor must be the last conductor to disconnect from the
terminal.
• Make sure that the earth conductor is longer than the phase conductors
on both ends of the cable.
Guidelines
• Protect electrical conductors from extreme heat, vibration and impact.
• The power line must be fitted with:
• a protection circuit.
• As extra protection against lethal electric shocks install a high sensitivity residual
current device, whose operating current differential is less than or equal to 30mA.
• An overvoltage category III all-pole mains isolator in the power supply network as
per current standards.
The electric control panel should:
• Be suited to the rated values of the electric pump, to properly protect the motor.
• Protect the motor from overload and short circuits.
• Protect the motor from overheating (circuit breaker protection);
• Be equipped with a system to protect against dry running, to which should be
connected the pressure switch, level sensors, floats and other suitable devices.
An inflow pressure switch is recommended if the pump is connected to the water
supply or level sensors/floats if the pump draws from a tank.
WARNING: The data regarding the power supply of the motor are shown on
the plate (Fig. 5-T) and paragraph 4.3.
Before starting up the motor, check that:
• The power cables conform, with 3 conductors (2 + Earth) for the single phase
versions and with 4 conductors (3 + Earth) for the three phase version.
• The power supply is compatible with the motor characteristics.
• Wire the electric cable to the motor according to the diagram shown on the label
inside the cover of the terminal box.
• Check that the earth cable is longer than the phase conductors. If the power
supply cables are pulled and detached from their cable stay, the last one that
should disconnect is the earth cable.
• Make the connection ensuring there is an effective earth circuit.
WARNING: Once the cables have been connected, replace the terminal
board cover; failure to follow these instructions may cause personal injury.
WARNING:
• Avoid any contact between the electric cables and the pipes or other
parts of the pump
• Carefully keep the cables away from damp.
• Tighten the cable glands properly to prevent moisture from entering the
terminal and to ensure protection against sliding of the cables.
The electric motors can run with the voltage shown on the data plate, with a
tolerance of +/- 10%.
The single-phase motors have built-in automatic thermal overload protection.
The three-phase motors have no thermal protection. The installer must install it in
the control panel.
6 START-UP
WARNING:
• Pay attention to discharged liquid so that it cannot cause damage to
people or things.
• The motor protectors can cause an unexpected restart of the motor,
which may cause serious personal injury.
• Never start up the pump without the coupling safety casings correctly
installed.
WARNING:
• During operation the external surfaces of the pump and the motor could
exceed 40°C (104°F) if the pumped liquid is not at ambient temperature.
• Do not touch the unit without proper protection.
• Do not place inflammable material near to the pump.
WARNING:
• The electric pump must NOT be started without first being filled.
10
HORIZONTAL MULTI-STAGE PUMPS
• Its use without liquid may permanently damage the mechanical seal.
• Do not operate the pump with the inlet and discharge valves closed for
more than 5 seconds.
• Do not expose the pump when idle to freezing temperatures. Frozen
liquid will damage the pump.
• The pump should not operate if there is cavitation, because this
damages the internal parts (see point 5.1).
Noise level
All the units generate an acoustic pressure level below LpA 70 dB.
6.1 Priming
With liquid level above the pump (positive suction head Fig. 5-B)
• Close the discharge valve (Fig. 5-8).
• Remove the filling caps (Fig. 5-A1 and Fig. 5-A2).
• Open the inlet gate valve (Fig. 5-4) to allow the liquid to enter and wait until the
water overflows.
• Close the inlet valve and tighten the caps (see tightening torques in Fig. 6).
With liquid level below the pump (negative suction head Fig. 5-A)
• Close the discharge valve (Fig. 5-8).
• Remove the filling caps (Fig. 5-A1 and Fig. 5-A2).
• Using a funnel, fill the pump until the water comes out, (this operation may need
to be repeated several times)
• Replace and tighten the caps (see tightening torques in Fig. 6).
6.2 Checking rotation direction
This operation is only required for three-phase motors. For single-phase motors, the
direction of rotation is already set.
• Start up the motor for 1-2 seconds, and check the direction of rotation through
the motor fan cover (no need to remove the cover). The arrow on the fan cover
shows the correct direction.
WARNING: Before any operation on the electric pump, check that the power
supply is disconnected and that it cannot be accidentally reconnected
during maintenance operations.
If the direction is wrong:
• Disconnect the power supply.
• In the terminal box or control panel of the motor, swap the position of two phases
of the power cable.
• Close the lid of the terminal box and/or control panel.
• Check again the direction of rotation.
6.3 Starting up the pump
Before starting up, check that:
• The electric pump is correctly connected to the power supply,
• The pump is correctly primed (procedure point 6.1)
• The discharge gate valve (Fig. 5-8) is closed and the inlet valve (Fig. 5-4) is open.
• Start the motor and gradually open the valve on the discharge side of the pump.
• After a few seconds of noisy operation to expel any air, the pump should function
silently and regularly without any changes in pressure. Otherwise refer to the
Troubleshooting table Point 9.

6.4 Emptying the pump

WARNING: Liquid may remain in some parts inside the pump.
To remove all liquid, the pump must be completely disassembled.
WARNING: Be careful that the discharged liquid does not damage people or
things.
If it is necessary to empty the pump for maintenance or for long downtimes, the
procedure is as follows:
Close the gate valves of the discharge and inlet piping (Fig. 5-8 and Fig. 5-4).
Partially unscrew the discharge cap to release pressure on the pump Fig. 5-A1.
When there is no more pressure completely remove the inlet and discharge caps
(Fig. 5-A3) and wait for pump to empty.
Once emptying is completed, replace and tighten the caps again, (tightening
torques shown in Fig. 6).
7 MAINTENANCE AND SUPPORT
WARNING: Before any repairs to the electric pump, check that the power
supply is disconnected and that it cannot be accidentally reconnected
during maintenance operations.
WARNING: If the electric pump is used for hot and/or hazardous liquids, it is
essential to inform the personnel who will carry out the repair.
In this case, clean the pump so as to ensure the safety of the operator.
WARNING: Repairing or having the electric pump repaired by personnel not
authorised by the manufacturer means losing the warranty and operating
with unsafe and potentially hazardous equipment.
WARNING: Be careful that the discharged liquid does not damage people or
things.
The electric pump does not require any ordinary scheduled maintenance.
If the user wishes to prepare a scheduled maintenance plan, bear in mind that the
due dates depend on the type of liquid pumped and the running conditions.
For spare parts and maintenance documentation, contact our sales and service
office.
Spare parts see (Fig. 8 and Fig. 9).