Thermal compensation

During normal operation, machinery is influenced of different factors and forces. The most common of these changes is the change in the temperature of the machine. This will cause the height of the shaft to increase. This is called thermal growth. To compensate for thermal growth, you enter values for cold condition compensation. It can be necessary to place the offline (cold) machine a bit lower to allow thermal growth.

To compensate for thermal growth, offset and angle values are used. The offset and angle values are based on a calculation point:

  • For short flex, the calculation point is in the center of the coupling.
  • For spacer shaft, the calculation point is on the left side of the spacer.

It is not possible to have both coupling and feet compensation on the same machine.

 

Set compensation on the coupling

  1. Tap on the coupling.
  2. Tap to open the Thermal Compensation view.
  3. Enter values for Vertical and/or Horizontal compensation. When you enter compensation values, the machine turns blue.
  4. Tap to return to Prepare view.

The compensation values are visible in the report.

  1. Offset and angle values for the left machine.
  2. Offset and angle values for the right machine.
  3. Spacer shaft.
  4. Calculation point is on the left side of the spacer.
  5. Turn Thermal compensation on/off. If you turn it off, the values are saved but will not be used.
    In Machine train, this will affect all couplings in the train.
  6. Show V (vertical) or H (horizontal) view.

NOTE! It is not possible to have both coupling and feet compensation on the same machine.

Set compensation on feet

Values are entered on the first and last foot on the machine. If the machine has more than two feet, calculated values on these are presented in the report.

  1. Enter distances.
  2. Tap on the machine.
  3. Tap to open the Thermal Compensation view.
  4. Enter values for Vertical and/or Horizontal compensation. When you enter compensation values, the machine turns blue.
  5. Tap to return to Prepare view.

  1. Feet value for the first foot.
  2. Feet value for the last foot.
  3. Turn Thermal compensation on/off. If you turn it off, the values are saved but will not be used.
    In Machine train, this will affect all couplings in the train.
  4. Show V (vertical) or H (horizontal) view.

NOTE! It is not possible to have both coupling and feet compensation on the same machine.

Example without compensation

A. Offline, no compensation set. The machines are aligned.

B. Running, the machine "grows" 5 mm, and is no longer aligned.

 

Example with compensation

In this example we assume a thermal growth of +5 mm in HOT condition. Therefore we compensate with -5 mm in offline condition.

C. Offline, a -5 mm compensation has been set.

D. Running, the machine grows and will be perfectly aligned!