Liebert TM-10098 Next Maintenance Calculation, iCOM Controls Training and Service Manual

iCOM Controls Training and Service Manual

during the second time frame the cooling process locks off and will require a power off sequence.

Next Maintenance Calculation

Foreword

The next maintenance calculation will help run the Liebert Environmental unit in an optimum way, to ensure minimum components stress resulting in increased reliability.

Calculation of next Maintenance Parameters

The following components are included in the calculation individually:

•Fan(s)

•Compressor 1

•Compressor 2

•Electric Heaters

•Humidifier

For each individual component the next maintenance will be calculated from following parameters:

1.Standard service interval (1, 2, 4 or 6 times a year, to be programmed).

2.Working hours (counted).

3.Number of starts (counted).

4.Average running time (calculated).

5.Optimum number of starts per hour (to be programmed).

6.Maximum number of starts per hour (to be programmed).

7.Maximum bonus to enlarge time to next maintenance (to be programmed).

8.Maximum penalty to reduce time to next maintenance (to be programmed).

The Maintenance Calculation is done as follows:

Basic: maintenance frequency (1). The control counts the working hours of the component, as well as the number of starts.

The working hours and the number of starts are compared with the programmed optimum / maximum starts per hour. This results in “Wellness Factor”.

This factor, in accordance to the service interval, will add a “Bonus” to increase the time before the next maintenance, or will add a “Penalty” to decrease the time before the next maintenance. In simple words: If a component starts very often, the time to next maintenance will be decreased, if it starts rarely, the time to next maintenance will be increased.

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