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An external lubrication of the mechanical seal should be installed if
a negative pressure is noticed.
A constant level oiler using pumped fluid should be connected to the
upper connection on bearing bracket.
The lower connection should be plugged to avoid air intake and avoid
dry running of mechanical seal.
This piping system should be used when a negative head of 5 mwc is
noticed in the inflow line near pump suction flange.
Connection of the leakage line :
NFCH pumps are designed to handle heat transfer fluids at a very
high temperature. A pipe should be connected to lower connection port
on bearing bracket to drain oil leakages safely :
Valves :
It is advised to install isolating valves on suction and discharge sides for
maintenance purpose. Those valves should be of large passage type and
could be locked in position.
Isolating valve on suction side should not be connected directly to pump
suction flange.
After pipe work is done turn pump shaft by hand and check it turns
freely. If it appears that it is difficult to turn pump shaft, then check
forces applied by piping to pump casing. Installation of piping should be
done again.
Location of connections :
Connections :
V = vent G1/8''
G = greasing connection G1/8''
B = connection for quench G1/4''
D = MS drain connection G1/4''
7.3 ELECTRICAL CONNECTION / EARTHING
Check that motor winding corresponds to site electric power
supply characteristics before electrical connections are performed.
Connecting a 230/400V motor on a 400V power supply or
connection of a 400/690V motor on a 690V power supply might
drive to motor destruction if terminal strip are positioned in a wrong
way.
Electrical connection should be performed by qualified personnel
only having necessary agreements and in compliance with local,
national and international regulations.
Equipments used in an ATEX zone will be connected in compliance
with CEI60079-14. It is the responsibility of the end user to select
proper type and size of electric cable.
Respect motor manufacturer instructions to make electric motor
connection (refer to the instructions supplied with the motor. they
are usually indicated inside motor junction box). Sensors will be
connected in compliance with the instructions given in dedicated
instruction manual.
7.3.1
TERMINAL STRIP POSITIONNING FOR STAR
(Y) AND DELTA () CONNECTION (MULTI -
VOLTAGES ELECTRIC MO TORS)
Multi-voltage winding for voltages 230/400V and 400/690V :
6 wiring terminals :
To change motor direction of rotation reverse two phases on wiring
terminals. Connection of earthing terminal is mandatory.
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