balanceo.3

Field balancing - Balancing procedure

Coefficient influenceprocedure

1) Initial unbalancing run 0 :

n n+1a

2a) Poor trial run 0+1 ( n+1 ) :

n n+1a

Target

m

3a) Evaluation of poor trial run 0+1 ( n+1 ) :

n

4a) Result trim run:Trial mass is removed:Result is calculated by rotating by 110°, multiplying mass by 5

Balancing result

2b) Good balancing run 0+1 ( n+1 ) :

n

n+1b

n

n+1b

Target

m

3b) Evaluation of good balancing run 0+1 ( n+1 ) :

Field balancing - Complete procedure

A

B

Let rotor disk roll freelyStatically balance mass if required

Initial unbalance run

4b) Result trim runTrial mass remains in place:Result is calculated by rotating by 110°, multiplying mass by 0.36

Rule :

Leave start field !

Optimal balancing result

n+1

n

n

4a) Result trim run:Trial mass is removed:Result is calculated by rotating by 110°, multiplying mass by 5

Balancing result

A

B

A

B

1st trim runCoarse, static A, B

2nd trim runCoarse, dynamic A, B

A only - Single-plane balancing

A

B

n.Check balancing result

D

C

B

A

Evaluation of overall vibra-tion according to ISO 10816Check whether balance grade has been reached, ISO 1940

Document results

G 2.5

2. When in doubt, check whether vibration caused by unbalance

f [Hz]

v[mm/s]

t [s]

max. value in spectrum > 50%

v[mm/s]

fn

D

C

B

A

1. Preparation for balancing

Overall vibration measurement according to ISO vRMS10...1000 Hz determine balancing direction and maximum valueevaluate according to ISO 10816Define levels, anglesEnter valuesDetermine causes

Balancing problems: overhung rotors

Allocation of measurement planes, standard caseWide rotor disks: static + dynamic unbalance

A B

B A

Direct drive: Use motor radiator fin as balancing plane B

B A

„Emergency balance“ for narrow impeller

A B

Belt drive: Use belt disk as balancing plane A

B A

BAA

Special case: narrow impeller

Large couple unbalance, small static unbalance,possibly exchange A B

A B

BA

Outboard overhung rotor: Use coupling as balancing plane A

AB

BA

A

Special case: narrow impeller

90° offset between trial masses at A, B

A B

B A

Aids for distributing and mounting masses

70°

55g

90°

0°180°

270°

70° mu

Only particular correction masses are available

Fixed angles for mounting( number of rotor blades )

Angle not ascertainable,

accessible externally only

nur außen zugänglich

Correction using fixed weights

90°

0°70°N° 1 110°

30 g N° 2 25° 30 g

2 masses

2

1

270°

Correction using fixed locations

90°

0°180°

N° 3 80° 36 g

N° 2 40° 13 g

9 blades

4

5

6

7

8

9

1

2

3

70°

Tape measure correction

90°

0°180°

Diameter: 2 m

1.22 m 55 g

70°

1,22 m

r = 1m

Accelerometer A

Trigger sensor

Trigger mark

Measuring plane A

Measuring plane BBalancing plane B

Balancing plane A

Mounting angle

B

A

A

T

A

B

0°

Trigger angle A

Accelerometer B

Mounting angle, measuring & balancing planes

SETUP DISPLAY MEASURE

ENTER

MENU CLR

ONOFF

7 8 9

4 5 6

1 2 30

GO ONFREEZECURSOR

COMENT SAVE

Measuring Spectrum2637 Hz 1.77m/s²

Hz 7312

6.5. 97 14 54

MAIN AUX CHARGESLEEP VIBRO CORD

A B

VIBROCORD : Count mounting angle on rot or against direction of rotation