Electrical Connection Of The Motor - Packo AX Instruction Manual

The pump should be installed as close as pos-
sible to the storage tank and as low as possible.
The NPSHa must be at least 0.5 Mt higher than
the NPSHr of the pump in the desired operating
point. Only in this way will cavitation be avoided.
The NPSHa (Net Positive Suction Head availa-
ble) is the total absolute pressure on the inlet of
the pump (static pressure and dynamic pressure)
reduced by the vapor pressure of the liquid. This
is the same as the sum of the absolute pressure
present upon the liquid in the storage tank, and
the height of the liquid column above the inlet of
the pump, reduced by the total hydraulic losses
of the piping between the storage tank and the
inlet of the pump and by the vapor pressure of
the liquid. The NPSHr (Net Positive Suction
Head required) can be found in our technical
leaflets. If you are not sure the suction condi-
tions of the pump in your installation are OK, please
contact PACKO.

4.4. Electrical connection of the motor

The electrical connection of the motor should
only be carried out when the power supply is
switched off. This should be done by qualified
personnel and according EN 60204 and local
national rules and standards. Special attention
should be paid to good earthing which must con-
form to your local national rules. Check on the
nameplate of the motor if it is suited to operate
on the available voltage and frequency.
Select the protection system and the feed cables
according to the details on the identification plate
of the motor. The drop in voltage during the start-
ing phase must be less than 3 %.
Tighten the nuts of the terminals, connectors and
supply cables to the torque indicated below (Nm):
In order to get good de-aeration, the pump should
be installed horizontally (motor shaft horizontal) with
the outlet vertical on top, or the outlet horizontal
on top towards the right, seen from the motor to
the pump. In other positions, make sure you have a
good de-aeration.
As an option, pump casings with de-aeration
ports are available. When the pump is installed
vertically with the motor on top, the motor must
be protected against falling water. Never install
the pump vertically with the motor below. A MSP,
CRP, PRP or IRP pump is always installed hori-
zontally and with the outlet of the pump on top.
Fix the pump on the base of the motor or on the
adjustable feet.
The pumps in the series NPIM, ICP2IM and
ICP3IM must be mounted so that the bottom
of the motor stands 10cm above the top of the
vessel (IML and IMXL). This also applies to the
externally mounted (IMO) models. This is to
ensure that the motor can never be submerged.
Terminal M4 M5 M6 M8 M10 M12 M16
Steel 2 3.2
Brass 1 2
Do not place either washers or nuts between
the motor connectors and the supply cable
connectors.
Ensure that the cable gland is dust and damp
proof: the cable gland must correspond to the
diameter of cable used. Bring the cables into the
terminal box with a radius that prevents water
from penetrating via the cable gland. (The cable
must leave the motor downwards.)
5 10 20 35
3 6 12 20
65
50
80