Electrical Connection; Assumptions; Power Supply; Connecting The Motor - Andritz SM Serie Instructions De Service

Series SM
• Lay the cable along the pump and protect it against damage
using the cable protection rail. Also observe the instructions
from the pump manufacturer.
4.4.1 Connecting the earth conductor
• Check whether the motors were supplied with earth conduc-
tors This depends on which connection variant of the motor
was ordered.
• The customer must ensure proper connection of an earth
conductor. If the motor does not have any earth conductor,
then an appropriate earthing terminal must be present on the
upper housing cover of the motor, which must be connected
properly to a separate earth conductor.
4.4.2 Extending the motor cable
The supplied motor cable can be extended by the customer. To
do this, use only extension cables
- whose materials are suitable for the application.
- which are approved for the temperatures occurring in your
medium.
- which have an adequate cross-section for the conditions
(power, cable length, etc.).
• When selecting a cable, pay attention both to the appropriate
electric strength and to suitability for the medium (especial-
ly for drinking water). When making a selection, check the
voltage drop on the cable in order to maintain the tolerances
of the supply voltage on the motor. Failure to observe this
may lead to overheating and damage to the motor.
• The installer is responsible for the proper selection and di-
mensioning of the cable.
• Protect the connection point of the cable against penetration
by water. There are shrink-fit sheaths, sealing compounds
or prefabricated cable sets available on the market for this
purpose.
• Please observe the specific supplier's instructions for han-
dling the insulating materials.
• The cable must be fastened carefully to each standpipe using
cable straps or cable clips. Depending on the size an weight
of the cable, fastening must be carried out every 3m or less.
The cable must not be subjected to any tensile load.
• Also observe the instructions from the pump manufacturer in
this regard.
• When installing the cable (or when removing the
assembly), the cable must be rolled up or laid out
carefully, so that if the pump should fall into the
well shaft there will be no injury to persons or dam-
age to property because of the cables that will nec-
essarily also fall into the well.
• It must be ensured that no persons step on the
coiled cables.
4.4.3 Measuring the insulation resistance
Carry out this measurement before the complete assembly is
lowered at the place of use.
• While it is being lowered, connect the first measurement ca-
ble to the earth conductor.
• Then connect the other measurement cable in turn with each
core of the connected motor cable - but not with the earth
conductor.
• Make sure that the contact points are clean.
18
• The motor is OK if the insulation resistance is as least as high
as the value in the following table. The motor must be com-
plete for the measurement to be correct.
Motor condition
New motor
Installed / repaired motor

5. Electrical connection

5.1

Assumptions

This chapter assumes that
• the motor has been assembled properly with the pump, as
described in chapter 4.
• the insulation resistance has been measured and assessed
as proper, as described in Chapter 4.
• the completely installed assembly has been mounted prop-
erly at the place of use, as described in the instructions of
the pump manufacturer.
For your safety!
• Work on the electrical system may only be carried
out by qualified specialists.
• Before carrying out any connection work, first be
make sure that the entire system is free of any
electrical voltage and that no-one can switch the
voltage on again unintentionally while work is still
being carried out on the system.
• Never work on electrical systems when thunder-
storms are approaching or are present. Lightning
can cause dangerous voltage surges.
• Failure to observe these instructions may re-
sult in acute danger to life due to electric
shocks.
5.2

Power supply

The power supply must meet the following minimum require-
ments in order to prevent damage to the motor and undesirable
system perturbations.
5.2.1 Power supply via mains connection
The following tolerances must not be exceeded, since other-
wise the motor will be damaged.
• The voltage tolerance must generally remain in the range
from -10% to +6% of the nominal voltage (measured at the
motor terminals).
• The deviation of a motor current from the average of all three
currents must not exceed 10%.
• In operation, the average value of all 3 phase currents must
not exceed the nominal current of the motor.
5.3

Connecting the motor

• Also observe the specification on the rating plate, and dimen-
sion the electrical systems accordingly.
• The following connection examples relate exclusively to the
motor itself - they do not represent any recommendation with
regard to the upstream control elements!
• Technically proper planning and execution of the installation
is the responsibility of the installer.
5.3.1 Fusing and motor protection
• Plan for an external power switch (1), so as to be able to dis-
connect the system from voltage at any time - for example in
the event of danger or work on the system.
• Plan fuses (2) for each individual phase.
Voltage
> 1000 volts
500 MOhm
200 MOhm
Table 2: Insulation resistances