MSAT 102-122-142-162-182-202-242
MSAT 102-122-142-162-182-202-242
MSAT 102-122-142-162-182-202-242
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CONTROL<br />
OPERATION OF THE MAIN MODULE<br />
COMPRESSOR ROTATION<br />
The processor also features other functions for the overall management of the unit. One example of this is compressor<br />
rotation. The compressor rotation function is enabled by setting the corresponding parameters. This means than when<br />
compressor operation is requested by the thermoregulator, the compressor that will start first is the one with the lowest<br />
number of operating hours, while the one that will stop first is the compressor with the highest number of hours. This<br />
function allows the number of operating hours to be divided evenly between both compressors. In any case, the first<br />
compressor can always be started first and the second compressor second, in the case of specific needs; the unit is<br />
delivered by the manufacturer with rotation enabled.<br />
COMPRESSOR TIMERS<br />
To maximise the quality of compressor operation, a number timers are required. Refer to the graph in Fig. 3-4 to better<br />
understand the meaning of the timers.<br />
Figure 3 Figure 4<br />
Comp. 1<br />
Compressor<br />
ON<br />
ON<br />
OFF<br />
Comp. 2<br />
Seconds<br />
ON<br />
OFF<br />
Seconds<br />
OFF<br />
ON-OFF safety time<br />
C01<br />
Seconds*10<br />
First-second compressor on interval<br />
C06<br />
First-second compressor off interval C07<br />
ON-ON safety time C02<br />
The graph in Fig. 4 shows two parameters. OFF-ON SAFETY TIME and ON-ON SAFETY TIME. The first parameter<br />
means that when a compressor stops a certain time must elapse before it can start again. This time is respected even<br />
when there is a request from the thermoregulator. The second parameter means that a certain time must elapse between<br />
two successive starts. In the case of units with two compressors, a further two parameters are used, that is, FIRST-<br />
SECOND COMPRESSOR ON INTERVAL and FIRST-SECOND COMPRESSOR OFF INTERVAL. The first parameter<br />
avoids simultaneous starts of the two compressors, mainly to avoid excessive current peaks. The second represents an<br />
interval between the shut-down of the first and the second compressor. The function of these two parameters are shown<br />
in the graph in Figure 3.<br />
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