Operation With Frequency Converter; Rotational Direction; Potential Equalisation - Pentair Jung Pumpen MULTICUT 08/2 ME Instructions De Service

ENGLISH

Operation with frequency converter

Frequency converters may only be used for controlling the fre-
quency of special models of three-phase pumps. For hydraulic
reasons we do not recommend operation below 30 Hz.
Alternating current pumps are unsuitable as a rule.
NOTICE! For physical reasons, pumps may not be operated at a
higher frequency than that shown on the type plate. If the fre-
quency increases beyond the value on the type plate, the pow-
er input increases and the motor is then overloaded.
For special models of three-phase pumps that are designed for
frequency converter operation, the motor type shown on the
type plate is labelled with an additional "K" (e.g. D90-2/75 CK).
These pumps also have a sticker on the end of the cable that
indicates their suitability for use with a frequency converter.
These motors are fitted with PTC thermistors as winding pro-
tectors. Voltages of more than 2.5 V may not be connected to
the winding protection terminals 40 and 41! For explosion pro-
tected pumps, a type-tested tripping unit that complies with
the EU type-testing requirements is also necessary.

Rotational direction

Not applicable for alternating current pumps. The rotational
direction must be checked before installation! If the rotational
direction is correct, the start-up jolt should be in the opposite
direction to the rotational direction arrow on the motor hous-
ing. The wrong rotational direction is also indicated if the pump
performs inadequately when installed, or if loud noises can be
heard during operation. If the rotational direction is wrong, 2
phases of the supply cable must be swapped over.
CAUTION!
The start-up jolt can be very forceful.

Potential equalisation

To comply with EN 60079-14 and EN 1127-1, an additional equi-
potential bonding must be installed for facilities with protec-
tive earth conductors in TN/TT networks in areas subject to
explosion hazards. In Germany, for example, the design must
be in accordance with VDE 0100, Part 540 (Association of Ger-
man Electrical Engineers).
No additional potential equalisation is required on site for Pen-
tair Jung Pumpen concrete or plastic chambers in explosion
zones 1 and 2 (statement made by TÜV Nord (Technical Inspec-
tion Agency) in March 2008).
Exception: if conductive parts, such as cable protection
sleeves made of corrugated pipe or a pressure pipe made of
metal, are connected to the chamber from the outside. In this
case, an electrically conductive connection must be made be-
tween the conductive parts and the housing of the pump(s).
For corrosion protection reasons, the connection should be
made using stainless steel.
Explosion protected pumps have a special connection point at
the cable entry point.
INSTALLATION
The pump must be installed as shown in the examples. For in-
stallations in accordance with DIN EN 12056-2, the pressure
pipe must be laid in a loop above the local back pressure level
10
and protected with a back pressure valve.
Dimensions of chamber
Single installation with pump base: 40 x 40 cm
Single installation with guide rail system: 40 x 65 cm
Duplex installation: 85 x 65 cm
Example installation with guide rail system
Assembly: Fix the coupling base firmly to the floor of the col-
lection chamber using plugs and then mount the guide rails.
Next, install the pressure pipe including the necessary fittings,
such as the non-return valve and shut-off valves.
Finally, fit the pump with the screwed-on coupling catch on to
the guide rails and lower it into place using a chain fixed to the
shackle.
A fixing facility for lifting gear should be provided above the
chamber opening at a sufficient height.
Level monitoring can be carried out using various systems.
Their specific characteristics and requirements can be found
in the relevant operating manuals.
WARNING!
In accordance with the explosion protection laws and regula-
tions, JUNG Ex-pumps should never be allowed to run dry or to
operate in "snore" mode.
The pump must switch off when the water level sinks to the
upper edge of the pump housing (x in the illustration), at the
very latest. This shut-down must be implemented via a sepa-
rate switching circuit. Dry running for servicing or inspection
purposes may only take place outside the potentially explosive
area.
A correspondingly larger diameter pipe should be used for
longer pressure pipelines to avoid pipe friction losses.
Rising pressure pipes must be protected from frost! A cham-
ber cover must be selected that is suitable for the intended use
and has the required load-bearing capacity.
If the pump is malfunctioning, part of the contents of the oil
reservoir could escape into the pumping medium.
Not Ex-pumps. If a hose is used as a pressure line, care must
be taken to ensure that for every pumping operation the hose
is completely empty before the pump is submersed. Any resid-
ual liquid would obstruct the ventilation of the pump housing
and therefore also hinder the pumping operation.
This situation can also occur if the pump runs dry, pumps down
to a lower lever than that shown in the installation drawing, or
runs in "snore" mode during the daily test run.