MOLL MOTOR 37 kW User Manual EN

Installation, operating and maintenance instructions

Installation, operating and maintenance instructions

Three-phase asynchronous motors with squirrel cage

Pole-changeable three-phase asynchronous motors with squirrel cage

Single phase AC motors with squirrel cage

1. General information ........................................................................................................................ 1

2. Description ...................................................................................................................................... 1

3. Protection class ............................................................................................................................... 1

4. Construction forms .......................................................................................................................... 2

5. Transportation, storage ................................................................................................................... 2

6. Installation and assembly ................................................................................................................ 2

7. Insulation test .................................................................................................................................. 3

8. Commissioning ................................................................................................................................ 3

9. Storage - Maintenance and Lubrication .......................................................................................... 7

10. Maintenance................................................................................................................................ 10

11. Condensate drain ........................................................................................................................ 10

12. Motors with thermal winding protection .................................................................................... 10

13. Repair, spare parts ...................................................................................................................... 10

14. Troubleshooting .......................................................................................................................... 11

Installation, operating and maintenance instructions

1. General information

The installation, operating and maintenance instructions apply to the following engine series:

- Series Y three-phase asynchronous motors with squirrel cage with energy efficiency classes IE1,

IE2 and IE3 and the series designations:
Y3…, Y2…, Y3HE…, Y3HE2…, Y2HE…, Y3PE…, Y2PE…, Y22PE…, YE3…, YE2...

- Series MS three-phase asynchronous motors with squirrel cage with energy efficiency class IE1

- Series Y pole-changeable three-phase asynchronous motor with squirrel cage

- Series GMYL, ML and MY single-phase AC motors with squirrel cage

To avoid damage to the motors and the equipment to be driven, follow the instructions in the
operating and maintenance instructions. In particular, to avoid danger, the safety instructions
must be strictly observed. All applicable national, local and facility-specific regulations and

requirements must be taken into account.

In general, compliance with the 5 safety rules, e.g. in accordance with VDE 0105, when dealing with
electrical systems:

1. Unlock

2. Secure against reconnection

3. Detect no voltage

4. Grounding and shorting

5. Cover or restrict adjacent live parts

Since the operating and maintenance instructions cannot contain individual information for all conceivable
special areas and areas with special requirements for the sake of clarity, appropriate protective measures
must be taken during assembly by the operator.

Special versions and construction variants may differ in technical details!

2. Description

The motors comply with the harmonized requirements of the EN 60034 standards and comply with the
CE-relevant regulations:

- Electromagnetic Compatibility Directive 2014/30 / EU (EMC)

- Low Voltage Directive 2014/35 / EU

For three-phase asynchronous motors with squirrel cage, the following applies in addition:

- Regulation (EC) 640/2009,

according to which the requirements of the energy efficiency classes IE1, IE2 and IE3 are met.

3. Protection class

The degree of protection of the motors is specified on the nameplate, mounted auxiliary devices can differ
in the degree of protection from the motor. This must be observed when installing the motors.

When installing motors outdoors (protection rating> IP 44), it must be ensured that the motors are
protected against the direct effects of the weather (freezing of the fan, direct rain, direct sunlight, snow
and ice).

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Installation, operating and maintenance instructions

4. Construction forms

The design of the motors is indicated on the rating plate. Use in deviating construction forms is permitted
only after approval of the manufacturer and, if necessary, conversion according to its instructions.
The operator must ensure that, especially in the case of designs with a vertical shaft, the falling in of foreign
bodies into the fan cowling is prevented (for example by a rain protection roof).

5. Transportation, storage

If possible, the motors should only be stored in closed, dry rooms. Storage in open-air areas with roofing
is only permitted for a short time, but they must be protected against all harmful environmental
influences.
The motors must be stored vibration and dust-free and secured against mechanical damage.
The shaft end is protected against corrosion with a special coating. This protection must be checked
regularly and renewed if necessary. It is recommended in the interest of consistent lubrication to rotate
the shaft by hand on a regular basis. If the time from delivery to commissioning of the machine is more
than 3 years, the bearings should be checked and, if necessary, replaced on the recommendation of the
bearing manufacturer.

The motors must not be transported or stored on the fan cowlings. For transport use the ring bolts / lifting
lugs of the motors using suitable slings. These are intended only for lifting the engines without additional
attachments, such as base plates, gears, etc. If ring bolts are removed after installation, the threaded holes
must be permanently closed according to the degree of protection.

6. Installation and assembly

Since the temperature of the motor on the surface can be over 100°C during operation their
contact must be prevented if the motors are installed in accessible areas.

Likewise, no temperature-sensitive parts may be attached or attached to them. Ventilation openings are
to be kept clear and a minimum distance of approximately ¼ of the diameter of the air inlet opening must
be maintained so that the flow of cooling air is not impaired.
It must be ensured that the blown out heated cooling medium is not sucked in again.

The feather key in the shaft end is secured by the shaft sleeve only for transport and storage,
a commissioning or a test run with the feather key only secured by the shaft sleeve is strictly
prohibited due to the risk of skidding of the feather key!

When mounting the transmission element (such as clutch, pinion or pulley), use mounting devices or heat
the part that needs to be wound up. For mounting the shaft ends have centering with threaded holes. The
impact of transmission elements on the shaft is inadmissible, as the shaft, bearings and other parts of the
motor can be damaged.

All elements to be mounted on the shaft end are to be balanced dynamically in accordance with the
balancing system of the motor (whole or half feather key). The motors should be set up as free of vibration
as possible. For motors with low vibration, special instructions must be followed. After completion of the
installation, the operator must ensure the protection of moving parts and ensure operational safety.

When the driven machine is coupled directly coupling the axes of machines have to be particularly
precisely aligned. The shaft height is to be adjusted by appropriate supplements of the driven machine.
Belt drives strain the engine with relatively large radial forces. In particular, during assembly, the belt
pretension must be set exactly to the specifications of the belt manufacturer.

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Installation, operating and maintenance instructions

7. Insulation test

Before first use and especially after prolonged storage the insulation resistance has to be measured
between winding to ground and between phases. The test voltage is 500V.

Dangerous voltages occur at the terminals during and immediately after the measurement,
therefor avoid touching the terminals. The operating instructions of the insulation measuring
device must be strictly observed!

Depending on the rated voltage UN, the following minimum values must be maintained at a winding
temperature of 25 ° C:

Minimum insulation resistance of new motors >= 10MΩ
Critical specific insulation resistance for motors that are not as new >= 0.5MΩ / kV
If the minimum values are not reached, the winding must be properly dried until the insulation resistance
complies with the required value.

8. Commissioning

According to Machinery Directive 2006/42/EC, commissioning in the European Community is prohibited
until the conformity of the system in which the machine is installed is determined by this directive. When
used outside the European Community, the country-specific regulations must be observed.

The exact observance of the safety instructions is again explicitly pointed out. All work must
only be carried out when the motor is in a dead-voltage state!

The installation must be carried out in accordance with the applicable regulations by appropriately trained
specialist personnel.

When operated with inverter, electromagnetic interference of different levels may be caused. For
machines with built-in sensors, e.g. PTC thermistors, the converter can also cause interference voltages
on the sensor cable. It is therefore recommended to use shielded cables.

The dimensions of the connection cables must be adapted to the rated currents of the motor. The motors
must be operated with an overcurrent protection set according to the rated motor data. Otherwise there
is no warranty claim in case of winding damage.

Before coupling the working machine, check the direction of rotation of the motor to prevent any damage
to the drive unit.

The connection of the motor must be made after presentation of the respective circuit diagram. It is also
important to ensure that a secure, electrical connection is maintained (no protruding wire ends), as well
as a safe protective conductor connection is made.

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