RACKS CABINETS & E S, C,
enclosure temperature of 35°C can be guaranteed under all load conditions and under all the ambient conditions that could bemet at themachine’s location.
CHECKING HE ENCLOSURE EMPERA
CHECKING THE ENCLOSURE TEMPERATUREATURE
The first check is tomeasure the
temperature within the enclosure to assess its climate control capability. Temperature sensors should be placed in a position within the airflowof the enclosure, sensors should not b e placed on or near direct airflowfromhigh temperature components. Otherw
rwise temperature readings can be
found to be inaccurate. The sensors should be left tomonitor the temperature trend over a period of time.
If the sensor records air temperatures of well over 35°C (set point) then the output of the cooling unit should either be considered insufficient or, alternatively, that there has been amalfunction of the cold air routing in the enclosure. Thismeans that the cooling air cannot reach (or can only partially reach) the temperature-sensitive components.
CHECKING HE CON ROL BEHAVIOUR OF COOLING DEVICES
CHECKING THE CONTROL BEHAVIOUR OF COOLING DEVICES
AV
Another easy way of checking an enclosure climate control systemis to observe the cooling unit’s control behaviour:
Unlike speed-controlled cooling devices such as the newRittal “Blue e+” coolin g uni ts, conventional enclosure cooling units beginwith the two-point regulation of the cooling operationwhen a temperature inside the enclosure gets above of 35°C and finishes when the shutdown temperature of 30°C is achieved (at a typical hysteresis of 5K). If a cooling device does not reach the shutdown temperature, a co nventiona l
ETS & ENCLOSURES
SUPPLEMEN
SUPPLEMENT
Figure 2
cooling unit will therefore continue to operate. If this happens, it’s a good indication that the cooling unit has an insufficient output and suggests that there is likely to be a deficiency in suitable cooling air to the components inside the enclosure.
REFRIGERAT REFRIGERA ION ATION
You can simply touch a device to determine a refrigerator’s operating status: the activity of the refrigeration compressor during cold prod uction is accompanied by a slight vibration of the refrigerator housing that can easily be felt. Alternatively, the exhaust
temperature of the cooling unit in the external air circuit may be measured. During active cooling operation, thi s
Figure 1: Figure 1:
Checking your enclosure cooling system
cooling sys Checking y
Figure 2:
Figure 2: Yo
You can a so do a rough heck of an enclosure’s
hermography
ou can also do a roughl check of an enclosure’s climate contclimate control systemrol system with infwith infraredrared tthermography
our enclosure tem
will be significantly higher (potentially, anywhere between 10° and 40°C) than the ambient temperature.
LOCATING HO SPO OCATING HOTSPOTS
You can also do a rough check of an enclosure’s climate control systemwith infrared thermography whichmeasure the surface temperatures of the components inside the enclosure and these are recorded with an infrared camera. If any areas have significantly elevated temperatures (“ho t sp ots”) it is an indication that they are not being supplied with enough cooling air.
Rittal
www.rittal.co.uk www.rittal.co.uk T: +49 (0) 2772/5050
Figure 4 IT INFRIT INFRASTRUCTUR E TRUCTURE ELECTRONICS SOFTWARE & SERVICES SOFTWA WA RE & SERVICE S
www.rittal.co.uk ELECTRONICS | SEPTEMBER 2017 S7
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