GEFRAN-SIEI ARTDrive Vector V2 400Vac Series, Instruction Manual

Page: 34 / 387

34 • Chapter 3 Installation Guidelines ARTDrive V2 series - Instruction Manual
3.4 Motors and Encoders
The AVy Drives are designed for the field oriented regulation of standard three-
phase induction AC motors. A sinusoidal encoder or digital encoder can be
used for feedback in proportion to speed.
3.4.1 Motors
3.4.1.1 AC Induction Motors
FOR BEST RESULTS:
Select a inverter duty single cage induction motor with a minimum slip of 3-5%.
a) Minumum motor size:
motor amps no less than 30% of drive rated amps
at 400 Vac (for AVy... - 230...480Vac) or 575 Vac (for AVy...-5,
575Vac)continuous rating.
b) Rated volts/rated frequency:
the motor nameplate should be no less than
a 400 Vac/30 Hz ratio (for AVy... - 230...480Vac) or 575 Vac/30 Hz ratio (for
AVy...-5, 575Vac).
c) Flux range:
(thought as weak field range for hi speed motors) no more than
4:1
d) General purpose motors
can be used but require additional
AC output
chokes
e) Inverter duty motors
are desirable and
do not require output chokes
f) Hight efficiency motors
are acceptable in V/Hz and FOC operation. Do
not use for encoderless vector (SLS) operation
g) Avoid double cage low slip (<3%) motors if possible, but do not use
these motors with encoderles vector SLS regulation.
The electrical and mechanical data of standard three-phase motors refers to a
particular operating range. The following points should be noted when these
motors are connected to an AC Drive:
Is it possible to use standard induction motors?
With the AVy Drives it is possible to use standard induction motors. Some features
of the motor have a great influence on the obtained performances. Notice also
what is stated in section 2.3.4, “AC Output”, about the voltages and the motor
power.
Cooling
The cooling of three-phase motors is normally implemented by means of a fan
that is mounted on the motor shaft. Remember that the output of the fan is
reduced when the motor is running at lower speeds, which in certain
circumstances may mean that the cooling is insufficient for the motor. Check
with the motor manufacturer whether an external fan is required and the motor
speed range in the application concerned.
Operation above the rated speed
Due to the mechanical factors involved (bearings, unbalance of rotor) and due
to the increased iron losses, consult the manufacturer of the motor if this is
operated above the rated speed . Contact the motor manufacture for information.
What motor data is required for connecting the frequency inverter?
Nameplate specifications
-
Motor rated voltage
- Motor rated current