Electric Motor; Connection; Inverter Powered Electric Motor; Rotation Direction - FPZ SCL K07 TD-MOR Betriebsanleitung

4.2

ELECTRIC MOTOR

Electrical danger!
Improper installation may result in serious injury and
•
even death!
Work on electrical
•
maintenance) is only to be done by qualified, authorised
electricians!
Before starting to work on the unit or plant, the following
•
precautions must be taken:
Make sure that the line is NOT switched on.
Adopt measures to prevent it being switched on again.
Only open the terminal box after checking that the power
is off altogether!
The terminal box must not contain:
•
Foreign bodies
Impurities
Moisture.
Close the cover on the terminal box and seal the openings in
the cable glands in order to prevent dust, water, and
moisture to penetrate.
Check the seals periodically.
Should you touch a defective unit there may be a danger
•
of electric shock!
Fit a motor trip-switch.
Have the unit's electrical system checked by an
electrician on a regular basis.
The electric motor is sized to work at an ambient temperature
between -15° C (+5° F) and +40° C (+104°F), and a maxi mum
altitude of 1000 m (3300 ft) above sea level.
Under other conditions the motor cannot be used at full load
and so difficulties may arise for starting.
WARNING!
A maximum of n° 6 evenly distributed starts per hou r, is
allowed.
Failure to comply with this may seriously damage the unit.
4.2.1

CONNECTION

WARNING!
Connecting the motor incorrectly may seriously damage the
unit.
The power supply for the motor and any auxiliary equipment
must be provided using cables of suitable section to avoid
abnormal overheating and great voltage drops.
Check that the details on the nameplate are compatible with the
line voltage and frequency.
A voltage tolerance of ±10% compared to the nominal value is
admissible.
Connect the motor's earth cable to the relevant terminal marked
with this symbol always before connecting to the mains
supply and check the dispersion capacity.
The earth cable can be recognised by its colour (yellow/green).
This connection to the main supply must be formed as shown in
the wiring diagram contained in the terminal box.
Use the cable gland openings to allow power supply cables to
pass into the terminal box.
Proceed to tighten the power supply cables, taking the section
of the electrical cables into account each time.
The terminal block connections must be tightened properly to
avoid high contact resistances and resulting overheating.
Check that the insulation gaps between the various conductors
are not in contact with other surfaces, as indicated in the
standards.
equipment (installation and
All the screws used to close the terminal board must be
tightened properly.
immediately, using screws of the same or better quality.
The connection must guarantee:
- that it will maintain integrity over time.
- that no wire ends are sticking out.
Fuses do not constitute protection for the motor, but merely
protect against short-circuits.
Size the fuses according to the peak currents, especially when
using direct starting.
Protection with a (thermal or amperometric) trip switches is
essential to deal with risks of overloading, a loss of one phase
in the mains supply, excessive voltage fluctuations, or the rotor
getting stuck.
Set the motor trip switch using the current value shown on the
nameplate as a maximum.
4.2.2

INVERTER POWERED ELECTRIC MOTOR

WARNING!
A maximum of n° 6 evenly distributed starts per hou r, is
allowed.
Failure to comply with this may seriously damage the unit.
WARNING!
The unit's nominal pressure or vacuum characteristics for
service at mains frequency cannot be maintained if the unit
is powered via an inverter.
If an inverter is used for the power supply the installer is
responsible for the checks and any steps necessary to comply
with the immunity and emission limits laid down by the
standards.
When using the unit with a motor powered via an inverter,
follow the wiring
manufacturer carefully.
WARNING!
The performance of the unit powered via an inverter is
shown in the relevant tables that can be requested from
FPZ's assistance service.
4.2.3

ROTATION DIRECTION

The SCL K compressors–vacuum pumps must be used with the
rotation direction shown by the arrow on the fan guard for the
electric motor (see figure below)
To check the direction of rotation, switch on the motor very
briefly. If the rotation direction is incorrect, switch the position
of two of the three power supply conductors on the terminals.
GB - 24/69
Damaged screws must be replaced
instructions supplied by the inverter
.