Siemens 6DL2804 Series, Hardware Installation Manual

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Mounting
4.5 Use of I/O device at temperatures down to -40 C
Distributed I/O device 6DL2804-xxxxx
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Hardware Installation Manual, 03/2014, A5E00378896F-03
4.5 Use of I/O device at temperatures down to -40 °C
You must install a heater in the enclosure in order to operate the devices at temperatures
down to -40 °C. Note the following:
When using a closed enclosure, only switch the installed components on following a specific
warming-up time which depends on the enclosure size and heating power:
● With enclosure types 6DL2804-xxDxx and -xxExx, the warming-up time is at least 2
hours.
● With enclosure types 6DL2804-xxKxx and -xxUxx, the warming-up time is at least 3
hours.
Figure 4-2 Temperature response with 100 W heater for 6DL2804-xxDxx / -xxExx
Temperature response inside the enclosure following switching-on of the heater at an
outdoor temperature of -40 °C.
After > 2 hours, the internal temperature is above the minimum permissible operating
temperature of the installed components of -20 °C.