Calpeda MXV-B Instrucciones Originales De Uso página 19

conditions are indicated on the motor plates. All the indi-
cations given in this manual and in other instructions mu-
st be respected.
If these limits are exceeded, check the motor data and
the construction characteristics. Contact CALPEDA for
more information.
Non-compliance with the instructions or not
carrying out maintenance on the equipment can
compromise safety and prevent the machine from
being used.
4.2 Cooling
Make sure the motor is sufficiently aired. Make sure that
close objects or direct sunlight do not create additional
heat to that of the motor.
5. Motors working at variable speed
Variable speed drives cause higher voltage stress than si-
nusoidal supply for the motor winding, so request a motor
that is suitable for use with a frequency variator.
5.1 Thermal protector
The motors can come equipped with PTC thermistors in
the stator windings if present. We advise connecting the
thermistors to the frequency converter using suitable
means.
5.2 Starting variable speed applications
Variable speed applications must be started in complian-
ce with the frequency converter instructions and local
laws and regulations.
The requirements and limitations set by the application
must also be considered.
All the parameters needed for setting the converter must
be taken from the motor plates.
The requested parameters, in general, are:
- Nominal motor voltage
- Nominal motor current
- Nominal motor frequency
- Nominal motor speed
- Nominal motor power
NOTE If the required information is missing or impreci-
se, do not start the motor without having checked the
correct settings.
CALPEDA recommends using all the protection characte-
ristics supplied by the converter to improve application sa-
fety.
The converters generally guarantee characteristics such
as (the characteristic names and availability depend on
the producer and the converter model):
- Minimum speed
- Maximum speed
- Acceleration and deceleration times
- Maximum current
- Maximum torque
- Protection against accidental stops
6. Maintenance
There may be current used for powering resistors
or heating the winding directly inside the terminal
box while the motor is stopped.
The capacitor in single-phase motors can maintain
a charge that appears between the motor termi-
nals, even when the motor itself has stopped.
A motor with frequency converter can be powered
even with the motor stopped.
6.1 General inspection
1. Inspect the motor at regular intervals, minimum at least
every year. Control frequency depends, for example,
on the level of humidity in the environment and the spe-
cific climatic conditions. Determined initially in an ex-
perimental manner, it must then be respected with ex-
treme precision.
2.Keep the motor clean and guarantee good ventilation.
If the motor is used in a dusty environment, the ventila-
tion system must be cleaned and checked regularly.
3.Check the shaft seal conditions (for example V-ring or
radial shaft seal) and replace the seals if necessary.
4.Check the state of the connections
5.Check the state of the bearings, checking for strange
noises, vibrations, temperature.
When signs of wear appear, dismantle the motor, check
the worn parts and make the necessary replacements.
When replacing the bearings, use ones that are identical
to those used originally. When replacing the bearings, re-
place also the shaft seals with ones of the same quality
and characteristics as the originals.
6.1.1 Motor in standby
If the motor remains in standby for a long period in places
with vibrations, follow these precautions:
1. The shaft must be rotated periodically every 2 weeks
(record when this is done) by starting the system. If
starting is not possible for any reason, rotate the shaft
manually once a week so that it takes on different posi-
tions. The vibrations caused by other equipment can
cause bearing pitting, which can be reduced to a mini-
mum with normal operation or manual rotation.
6.2 Bearings
The maximum working temperature of the grease
and the bearings, +110°C, must not be exceeded.
The maximum nominal motor speed must not be
exceeded either.
Bearing size depends on the motor size:
Motor
size projection side
80-90 6205 2Z/C3 WT
100-112 E2 6306 2Z/C3
132 E2 6208 2Z/C3
160 E2 6310 2Z/C3
180 E2 6310 2Z/C3
7. Servicing
7.1 Spare parts
When ordering spare parts for a motor, indicate the serial
number, the complete name of the product type and code
as indicated on the motor plate.
7.2 Rewinding
Rewinding must always and only be carried out by an
authorised workshop.
7.3 Bearings
Bearings require special care.
They must be removed using extractors and fitted hot or
using suitable instruments.
Changes reserved.
19
Bearing on Bearing on
fan side
6204 2Z/C3 WT
E2 6206 2Z/C3
E2 6207 2Z/C3
E2 6308 2Z/C3
E2 6309 2Z/C3