Insulation Check; Motor Connection; Electric Connection For Low-Voltage (Up To 1,000 V) - VEM W41 Series Installation, Operating And Maintenance Instructions

Installation, Operating and Maintenance Instructions (Translation)
Procedure:

Near the screw holes of the motor feet diagonal bores are made; the diameter depends on the size of the
machine and is 12 to 25 mm. These bores must be extended diagonally into the steel parts of the founda-
tion with the same diameter.

These bores must be opened by using a taper reamer (taper 1:50) until it is possible to insert the taper pin
flush from above.

On the taper pin (1) the hexagonal head screw (3) must be screwed on together with the washer (2) for ap-
prox. 5 mm. Then the taper pin (1) is driven in carefully by using a hammer so that it is sunk in some mm.

The hexagonal head screw (3) is screwed on tight by hand.

When the motor is disassembled the taper pin can be removed by fastening the hexagonal head screw.

9. Insulation Check

When the motor is first commissioned and especially after extended storage, the insulation resistance of
the winding is to be measured to earth and between phases. During and immediately after the measure-
ments dangerous voltages are present at the terminals. Therefore never touch the terminals and follow
the operating instructions of the insulation resistance meter closely!
Caution! Secure motor against accidental starting! Ground the windings at least 10 s to avoid electrostatic charging
before and after insulation measurement!
To assess the insulation resistance the following table is used. Please observe that always the insulation value R
of the cold motor (that is at ambient temperature of approx. 25°C) is assessed, as values from warm motors are not
unambiguously reproducible. For a new motor from production or after rewinding of the stator the minimum value of
the insulation at ambient temperature must comply with the values of point 1 in the table.
During transport and storage under unfavourable conditions this value can be reduced without damage to the insu-
lation. Even motors standing still for some time under extreme climate conditions and with no anti-condensation
heating (condensation on the winding) can be taken into operation if the insulation resistance of the cold motor is
not below the values from point 2 of the table. If the insulation value is below that value the windings must be dried
or in some special cases even cleaned and then dried. It must be checked if the insulation value was restored after
a short time of operation. Under normal storage conditions and operational breaks the insulation resistance must
not fall below the values from point 2 when the motor is still cold.
Voltage
Test voltage
Test duration
1. Winding new or after rewinding, dry,
25 °C
2. Winding after longer operational
time, drying condition unknown, 25 °C
Table: Insulation resistance
If the minimum values are lower, the winding must be dried properly until the insulation resistance corresponds to
the required value.

10. Motor connection

10.1 Electric connection for low-voltage (up to 1,000 V)

The connection has to be done by qualified personnel according to the valid security regulations.
Outside of Germany the required national standards must be applied.
Name plate designations have to be observed under all circumstances!
The electric installation should be organised in detail before realisation. Connection diagrams delivered with the
motor must be read carefully before starting installation work. It is important that the supply voltage and the fre-
quency comply with the data on the name plate of the motor. In addition the mains voltage and the frequency must
be within the limits of the tolerances specified within the corresponding standard. Please observe the data on the
name plate and the connection diagram under all circumstances.
CAUTION! Ground the motor with the provided connection terminals for the grounding in the terminal box and
on the foot.
The terminal box must be free of pollution, humidity and foreign particles. The terminal box itself, the cable glands
and unused cable entries must be closed protected against dust and water. Take extra care when connecting the
.
VEM motors GmbH-2013
Rated voltage < 1.5 kV
> 100 V up to max. 500 V
> 50 MΩ
R
is
> 1 MΩ
R
is
17
Rated voltage > 1.5 kV
1000 V
1 min
> 100 MΩ
R
is
> 5 MΩ / kV
R
is
English
is