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MXV, MXV-B Rev6 - Operating Instructions
Page 25 / 136
The motor can only be used for the applications it has been
designed for. The nominal values and operation conditions are
indicated on the motor plates. All the indications given in this
manual and in other instructions must 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
sinusoidal 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 compliance
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
imprecise, do not start the motor without having
checked the correct settings.
CALPEDA recommends using all the protection characteristics
supplied by the converter to improve application safety.
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 terminals,
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 specific climatic
conditions. Determined initially in an experimental manner, it
must then be respected with extreme precision.
2. Keep the motor clean and guarantee good ventilation. If the
motor is used in a dusty environment, the ventilation 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, replace 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 positions. The vibrations
caused by other equipment can cause bearing pitting, which
can be reduced to a minimum 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
Bearing on
Bearing on
size
projection side
fan side
80-90
6205 2Z/C3 WT
6204 2Z/C3 WT
100-112
E2 6306 2Z/C3
E2 6206 2Z/C3
132
E2 6208 2Z/C3
E2 6207 2Z/C3
160
E2 6310 2Z/C3
E2 6308 2Z/C3
180
E2 6310 2Z/C3
E2 6309 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.
MXV, MXV-B Rev6.indd 25
01/10/18 17:06
