Electrical Connection; Starting Up; Starting; Breaking In The Mechanical Seal - DAB CP2-G Installations- Und Wartungsanleitungen

− They can be installed either on the delivery or return pipe with the motor axis in a horizontal or vertical position as long as the terminal box
is never facing downwards, in order to avoid dangerous water seepage in the event of leaks.
− It is possible to install the pump with the standard brackets, if available.
− To facilitate inspection and replacement, install the pump in an easily accessible position.
− The arrows on the pump body indicate the direction of flow. The use of gate valves on the suction and delivery pipes is recommended in
order to avoid draining the system in the event of repairs. In addition, provide a by-pass circuit between delivery and suction to ensure a
minimum of recirculation in the event that solenoid valves are used on the pipes, so as not to cause dangerous overheating.
− Ensure that the system is equipped with an air vent system and that the expansion tank (if fitted) is installed before the suction mouth.
When, on the other hand, the pump is installed on the delivery side of an open vessel circuit, make sure that the safety pipe is connected
before the pump.
− Mount the pump on the system without allowing the metal pipes to transmit excessive stresses or strains to the pump body, which could
lead to cracks and breakage.
− To prevent the transmission of noise or any vibrations, fit anti-vibration couplings to the suction and delivery mouths.
7.

ELECTRICAL CONNECTION

Strictly observe the wiring diagrams inside the terminal board box and those shown in the Tab. C at the end of the
booklet.
In the case of three-phase motors with star-delta starting, it must be ensured that the switching time between star and delta is as short as
possible and falls within table B at the end of the booklet.
Before accessing the terminal board and working on the pump, make sure that power has been switched off.
Check the mains voltage before making any connections. If it corresponds to the data plate, connect the wires to the terminal board, giving
priority to the earth wire.
The pumps must always be connected to an external switch.
The motors must be protected by motor protectors that are appropriately rated in relation to the current indicated on the data plate.
In systems where the twin version is envisaged, for the purposes of continuity of service, provide separate wiring and switches for each
individual pump.
8.

STARTING UP

Before starting the pump, check that:
− the pump has been properly primed, filling the pump body completely. This ensures that the pump immediately starts to
work regularly and that the seal (mechanical seal or stuffing box seal) is well lubricated. Dry operation causes irreparable
damage to the mechanical seal and the stuffing box seal;
− the auxiliary circuits have been correctly connected;
− all the moving parts have been protected with suitable safety systems;
− the electrical connection has been made as indicated previously.

8.1 Starting

Before starting, it is essential to fill the system with water and to vent the air. Vent the residual air from the pump body via the venting tap
until only water comes out. This is to ensure that the mechanical seal is well lubricated and that the pump starts running smoothly
immediately.
Power up and check the correct direction of rotation which, looking at the motor from the fan side, should be clockwise. The check should
be carried out after the pump has been powered up by acting on the main switch with a fast start-stop sequence. If the direction of rotation
is reversed, invert any two phase leads, after having isolated the pump from the power mains.
When the hydraulic circuit has been completely filled with liquid, gradually open the delivery gate valve to the maximum permissible opening.
The energy consumption of the motor must be checked and compared with the value on the data plate, especially if the pump was
intentionally equipped with a motor with reduced power (check the design specifications).
With the electric pump in operation, check the supply voltage at the motor terminals, which must not differ by +/- 5% from the rated value.

8.2 Breaking in the mechanical seal

The faces of the mechanical seal are lubricated by the pumped liquid, which means that some leakage from the mechanical seal may occur.
If the pump is started up for the first time or if a new mechanical seal is installed, a certain break-in period is necessary before leakage is
reduced to a minimum. The time required depends on the operating conditions, i.e. if the operating conditions change, a new break-in period
will begin. Under normal conditions, the escaping liquid evaporates immediately. As a result, liquid leakage is invisible. Liquids such as
kerosene do not evaporate and some drops will be visible, but this is not a sign of seal failure.
ENGLISH
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