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Insulation resistance, measured at +25°C winding temperature,
must not be lower than 10 M
winding run for a long time.
Lower values usually denote the presence of humidity in the wind-
ings; in this case let them dry (with warm air fl ow or by applying to
the windings connected in series an AC voltage not exceeding the
10% of the nominal voltage).
For use under long overloads or jamming conditions, cut-outs, mo-
tor-protections, electronic torque limiters or other similar devices
should be fi tted.
Where duty cycles involve a high number of on-load, it is advisable
to utilize thermal probes for motor protection (fi tted on the wiring);
NL
magnetothermic breaker is unsuitable since its threshold must be
set higher than the motor nominal current of rating.
For no-loads starts (or with very reduced load) and whenever it is
necessary to have smooth starts, low starting currents and reduced
stresses, adopt reduced voltage starting (e.g.: star-delta starting,
starting autotransfomer, with inverter, etc.).
After making sure that the voltage corresponds to name plate data,
wire up to the electrical power supply of motor, of possible brake
and auxiliary equipments, referring to Fig. 3 and 4 and other addi-
tional indications attached to present instructions.
EN
Select cables of suitable section in order to avoid overheating and/or
excessive voltage drops at motor terminals.
Metallic parts of motors which normally are not under volt-
age, must be fi rmly connected to earth through a cable of
adequate section and by using the proper terminal inside the
terminal box marked for the purpose.
In order not to alter protection class, close the terminal box by posi-
tioning correctly the gasket and by tightening all fastening screws.
For installations in environments with frequent water sprays, it is
advisable to seal the terminal box and the cable gland with adhesive
for seals.
For three-phase motors the direction of rotation is clockwise (drive-
end view) if connections are according to Fig. 1.
If direction of rotation is not as desired, invert two phases at the
terminals; for single-phase motors follow the instructions on Fig. 2.
In case of connection or disconnection of high polarity (
motor windings, there can be dangerous voltage peaks. Pre-arrange
the proper protection (e.g. varistors or fi lters) on the supply line.
Also the use of inverters requires some precautions relevant to volt-
age peaks (U
) and voltage gradients (dU/dt) generated by this pow-
max
er supply type; the values become higher by increasing the mains
voltage U
the motor size, the power supply cable length between
N
inverter and motor and by worsening the inverter quality.
For mains voltages U
> 400 V, voltage peaks U
N
gradients dU/dt > 1 kV s, supply cables between inverter and motor
> 30 m, it is recommended, especially in absence of proper non-
standard designs on motor (see manufacturer's catalog), to insert
suitable fi lters between inverter and motor.
Indications for the installation according to «Electromagnetic
Compatibility (EMC)» 2004/108/EC Directive.
Asynchronous three-phase motors supplied from the line and run-
ning in continuous duty comply with EN 50081 and EN 50082 stand-
ards. No particular shieldings are necessary. This is also valid for the
motor of independent cooling fan, if any.
In case of jogging operation, any disturbance generated by insertion
devices must be limited through adequate wirings (as indicated by
device manufacturer).
In case of brake motor with d.c. brake (HBZ, HBV, HBVM) and recti-
fi ers RN1, RR1 ... RR8, rectifi er-brake coil group can comply with
standards EN 50081-1 (emission levels for civil environments) and
EN 50082- 2 (immunity for industrial environments) by connecting in
parallel to the rectifi er a noise-reducing capacitor or fi lter (specifi ca-
tions on request; consult us).
When brake is supplied separately, brake cables must be kept sepa-
rate from power cables. It is possible to keep together brake cables
with other cables only if they are shielded.
Where motors are supplied by inverters it is necessary to follow the
wiring instructions of the manufacturer of inverter.
In case of design with encoder: install the electronic control board as
near as possible the encoder (and as far as possible from inverter, if
any; if not possible, carefully shield the inverter); always use twisted
pairs shielded leads connected to earth on both ends; signal cables
of encoder must be separate from the power cables (see specifi c
instructions attached to the motor).
7. Connections
7.1. Motor connection
Follow schemes on Fig. 1 ... 4 to connect the motor.
Rossi
Rossi
10
10
All manuals and user guides at all-guides.com
for new winding, than 1 M
6 poles)
> 1 000 V, voltage
MAX
Motor sizes ≤ 160S: before connect-
ing the motor for the fi rst time, pro-
ceed to knockout the openings on the
terminal box to allow the cable entry;
(see fi g. on the left); after that, accu-
rately remove any fragment still re-
maining inside the terminal box; re-
TX11 Operating instructions − UTD.164.06-2012.00_DE_EN
store the motor protection degree fi xing the cable glands (not
for
provided) with lock nut and employing the gaskets supplied inside
the terminal box.
Motor sizes ≥ 160M: use the cable glands supplied.
7.2. HBZ, HBV (HBVM) Brake (rectifi er) connection
Single-speed motors are supplied with rectifi er already connected
to motor terminal block. Therefore, for standard duties, motor is
ready to be used without any further connections for brake supply.
For two-speed motors, for those driven by inverter and for lifting
with on-load descent braking it is necessary to supply the rectifi er
separately with proper cables pre-arranged (for lifting it is neces-
sary to open the rectifi er supply also on d.c. side as shown in the
schemes). Follow the instructions of Fig. 5.
Verify that rectifi er supply voltage is the one stated on motor name
plate.
In case of brake equipped with microswitch (HBZ motor, «,SB», or
«,SU» code on name plate) refer to connection diagrams of Fig. 7 .
7.3. HBF Brake connection
Motor sizes
160S: brake coil pre-arranged as standard for brake
supply directly from motor terminal block when motor is Y-connect-
ed (brake coil already Y-connected to the auxiliary terminal block:
re-arrange the brake coil connection in case of motor ∆-connected or
in case of separate supply with ∆ voltage).
Motor sizes
160M: arrange on the brake auxiliary terminal block
the required brake coil connection (∆ or Y) properly positioning the
(loose) jumpers.
For both cases, before commissioning, connect the auxiliary termi-
nal block to the motor terminal block or to an external line.
For two-speed motors and for those driven by inverter it is neces-
sary to supply the brake separately with proper pre-arranged cables.
Follow instructions on page 9.
Always verify that brake voltage is the one stated on motor name
plate.
7.4. Auxiliary equipment connections
Connection of independent cooling fan.
Supply wires of independent cooling fan are marked by the letter
«V» on cable terminals and are connected to auxiliary rectifi er termi-
nals or to another auxiliary terminal block according to schemes of
Fig. 3, in function of identifi cation code of independent cooling fan:
– Code A: single-phase independent cooling fan (sizes 63 ... 90);
– Code D, F, M, N, P: three-phase independent cooling fan (motor
sizes 100 ... 280); usual arrangement is with Y connection with
voltages indicated below; for ∆ connection, consult us.
Verify that the direction of rotation of three-phase independent cool-
ing fan is correct (air fl ow must be towards drive-end; see arrow on
fan cover); on the contrary invert two phases at the terminals.
During the installation, verify that the supply data correspond to
those of the independent cooling fan; refer to code of independent
cooling fan as per motor name plate; running of motors with inde-
pendent cooling fan is allowed only when external fan is running;
in case of running with frequent starts and stops, it is necessary to
supply the independent cooling fan continuously.
Connection of bi-metal type thermal probes, thermistor type
thermal probes (PTC), anti-condensation heater.
The connection wires are inside the terminal box and are marked by
the letter «B» (bi-metal type thermal probes), «T» (thermistor type
thermal probes PTC) or «S» (anti-condensation heater) on cable ter-
minals; they are connected to an auxiliary terminal block according
to schemes of Fig. 4.
Bi-metal or thermistor type thermal probes need an adequate relay
or a release device.
Anti-condensation heaters must be supplied separately from motor
and never during the operation.
The anti-condensation heater must be supplied for at least two
hours before motor commissioning, in order to achieve a full thermal
steady condition.
For the design type identifi cation refer to the mark on cable con-
nected to auxiliary terminal block and to the relevant identifi cation
code stated on nameplate.
Connection of encoder
See specifi c instructions inside terminal box.
8. Periodical maintenance
8.1. Motor periodical mainenance
Periodically verify (according to environment and duty) and reset, if
necessary:
– motor cleaning (absence of oil, dirt and machining residuals) and
free passage of cooling air;
– correct tightening of electrical connections (see Tab. 1), of fasten-
ing screws and motor mechanical pairing;
– static and live tightening conditions;
– that motor run is free from vibrations (v
v
≤ 4,5 mm/s for P
> 15 kW), and anomalous noises; in this case,
eff
N
verify motor fastening, paired machine balancing or need for bear-
≤ 3,5 mm/s for P
≤ 15 kW;
eff
N
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