2.Installation

2.1 Installation environment

  Since well selected environment contributes very much to proper functioning of motors , you , therefore , must give your careful consideration to this matter when you prepare your purchase specifications . However , to insure operational safety , the following items are listed for your information :

1. Environment temperature

1. For standard motors , environment temperature normally has to be within the range from -15℃ to 40℃.

2. In case the environment temperature is too high , or excessive heat is inflected on the motor , protective measures , such as cooling measures or heat-insulating measures , should be taken ; or the load which makes the motor over-heated reduced .

3. On the contrary , if the environment temperature is too low , heating measures will also be necessary .

4. In case the motor is operated in the environment where the temperature falls out of the range as stated above , either too low or too high , design-wise re-consideration over the insulation , lead wire , lubrication , bearings fittings , steel parts and weldings of the motor is deemed necessary .

2. Good ventilation

1. If the circulation of cooling air into the motor is broken or impeded , abnormal temperature rising will occur.

2. Please keep things at least 20cm off INTAKE AIR ports .

3. Poorly ventilated environment

If the motor is installed in poorly ventilated environment, improvement steps have to be taken to guard the motor against being overheated .

4. If the motor is installed outdoor in moist or dripping environment, steps have to be taken to guard the motor against being overheated .

5. Dust

In a very dusty environment , following problems may rise ; and periodical dusting is recommended .

1. Open type

  A large accumulation of dust on windings and ducts of the core will result in over-heated windings . Moreover , dust and moisture retained by it may cause an insulation breakdown . In case dust accumulated around rotors is not evenly distributed, ill balance and , consequently , vibration may occur . If dust gets into the bearings , they may become damaged .

2. Totally - enclosed type

  A large accumulation of dust on fins of frame , their heat-dispersing effect will be greatly reduced . In case the dust accumulated on fan or transmission device is not evenly distributed , ill balance and , consequently , vibration may occur .

6. Damaging gases and steam

  In case damaging gases , such as corrosive gases , inflammable gases and other chemical gases , or steam exist in the environment , motors of explosion - proof type or anti-corrosion treated motors should be chosen ; otherwise , protective or safety measures should be taken . Particular attention should be placed on motor selection , when inflammable gases or dust , or steam , which are all in CNS and standards of other countries to make sure the explosion-proof motors you selected are constructionally satisfactory .

7. Accessible site

  Sites for installing motors should be accessible, i.e., in an open space so that motors will be carried to the sites and installed there conveniently . Moreover , the performance of jobs such as inspection , cleaning and maintenance (especially greasing ) will not be handicapped .

8. Foundation invulnerable to vibration

1. Motors should be installed on a solid and hard foundation or floor invulnerable to vibration from the environment .

2. Severe vibration from the environment may inflict on motors installed there in the following damages:

1. Depressions on roller bearings may occur during the periods when the motors are not running .

2. Windings may break.

3. The insulation of windings and their connecting wires may be damaged .

9. The ground or foundation on which motors are installed must be hard and stable ; otherwise , the amplitude of vibration may become augmented continuously , especially when coupled with machines of high vibratility , such as crusher and reciprocating compressor .

Vibration of large amplitude while the motor is running may bring about the following failures:

1. The insulating on the windings may be damaged .

2. The service life of bearings may become very short.

3. Parts may get loose or become displaced .

4. Cooling fan or other parts on rotor may fail due to fatigue .

10. Power supply

1. The supplied voltage should be stable , and the voltage drop should be kept to the minimum under loaded condition .

2. When the motor has to be powered by different voltage and frequency other than its rated ones , please refer to 4.2C and 5.2C for information . if it is not absolutely necessary, please do not do that , for motors may become over-heated and its performance may become undesirable .

11. Altitude of installation site

  In case the sites are more than 1,000 meters above sea level , the temperature of the motors operated there will be 5 to 10℃ higher .

2.2 Foundation and installation

  Foundation laying procedures will not be discussed here . As to installation of motors , your attention is invited to the following descriptions :

1. The base of motors should be buried into concrete or grout of the foundation to enable the motors to run stably . Do not bend or twist the base . Packers should be placed under the foot of motors (weight-bearing parts) and bearing stands . It is also necessary to place packers at both sides of base fastening bolts .All the packers should be spaced 300 to 500mm from each other so that they may share the weight on them evenly . It is better to use shrinkage-resist mortar and grout . The base fastening bolts could not be fastened until the mortar around them becomes completely hardened . Then considerable amount of grout should placed beneath the base so as to augment the stiffness of the foundation .

2. Foundation and base for 2-pole motors

   1. Since the synchronous speed of 2-pole motors reaches as high as 3,000 or 3,600rpm , if their foundation is not well designed and constructed , resonance may be resulted in . Be very careful , please .

   2. Natural frequency and resonance

      National frequencies of 2-pole motors are listed below :

      	FIRST	SECOND
      In 50Hz area	3,000cpm	6,000cpm
      In 60Hz area	3,600cpm	7,200cpm

        If the natural frequency of any other object in the installation equals or approximates any one of the values listed above , resonance will be resulted in .

        If natural frequency (fn) is considered in one free  degree , it may be expressed as :

      fn=1/2π×｛(g×K)/W｝^ (1/2)

      where  g=gravity acceleration

          W=weight of coupling machine

          K=elastic coefficient of the system

      The values of W and K should be carefully chosen that the value of fn will not equal or approximate any values listed above . If resonance is noted or suspected when the motor is running , please measure the natural frequency and change it (see 7 for details ).

3. Please check the following items upon completion of foundation and installation of motor base :

1. Check and make sure that the foundation has the stiffness stated in 2.1H and 2.1I .

2. Make sure the foundation possesses the stiffness required to keep the result vibration of the motor and its coupled machine to the minimum .

3. Check and make sure the construction is strong enough that sinking or distortion of the ground and foundation will not happen .

4. Check and make sure the concrete constructions have completed shrinkage or deformation .

5. Make sure the foundation and base have been leveled .Coupled machines should be leveled to each other ; the allowance of that should be kept under 0.2mm/IM .

6. Make sure there are spaces for base bolts , cable wire , thermometers , space heaters and distribution pipes for conductors ; and find out where they are .

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