| Front panel of the cooling water heat exchanger. At the top is the pressure gauge, should be at 1.8 - 2.2 bars. Next is temperature sensor selector, currently showing 17° C for external cooling media (sensor #6). |
Anders Liljeborg, 2019-04-23.
Cooling water pump stopped due to overload on 2019-04-23. This was caused by the filters in the cooling water circuits was very much contaminated with a dark-grey-green "goo". The filters were replaced and the pump motor controller was reset by shut off / turn on.When the cooling circulation was started again, the pump speed was lower, and still caused a higher flow rate than before, all shown in the images below.
The flow rate should be checked, and when it decreases it is a sign
that the filters need to be replaced.
The pump speed
should NOT be increased to increas the flow rate, this will
only lead to the same acidental shutdown as described here.
Settings after filter exchange:
| Front panel of the cooling water heat exchanger. At the top is the pressure gauge, should be at 1.8 - 2.2 bars. Next is temperature sensor selector, currently showing 17° C for external cooling media (sensor #6). |
| This is clearly showing the setting of the pump speed ("PUMPREFERENS"), it is currently set at about one oclock, this is the speed necessary after the filter exchange. See further down what flow rate this gives. |
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| This is the flow meters for the two cooling circuits, one for the system, and one for the compressor. | |
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Here are close ups of the flow meters, left is showing 6.8 liters
per minute, right is showing 9.5 liters per minute. The right hand
flow meter has a an extra pressure increassing pump to get enough
flow through the system.
Please note that when these flow rates decreases the filters need to be replaced. It is not good to increase the pump speed. | |
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| Here are the used filters, all heavily covered in grey-green "goo", most likely from some vegetable growth. The water needs some anti-growth agent. | |