Use Of I/O Device At Temperatures Down To -40 °C - Siemens SIMATIC ET 200iSP Installation Manual

• Heater:
To prevent condensation in the enclosure at low temperatures, it is recommendable to install
a heater. The heater must be dimensioned in accordance with the enclosure size.
A heater permits operation of the devices at temperatures below -20 °C.
Note
The optionally available heater can be fused with a type B miniature circuit breaker up to 16 A
for short-circuit and line protection. A residual current device with a rated value of 300 mA
must be installed, preferably 30 mA. Neither is installed in the Ex device.
• Modular electro-pneumatic automation system AirLine Ex (type 8650, from the company
Bürkert):
Connected to the ET 200iSP components to form an automation system for processing
electrical and pneumatic variables.
When connecting and operating, observe the manufacturer's descriptions and manuals.
• When installing a pneumatic system, exit the air passing through the exhaust connections
out of the enclosure.
Note
If components with a supply voltage of 120 / 230 V AC are installed, you must fuse these
devices according to the manufacturer information.
5.5 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 commissioning the enclosure in the closed state, switch on the built-in components
only after a specific warming-up time, depending on the enclosure size and heating power.
With enclosure types 6DL2804-xxDxx and -xxExx, the warming-up time is at least 2 hours.
NOTICE
Low temperatures can cause serious damage
If components in the cabinet are switched on and operated at temperatures below the
specified minimum ambient temperature, they can suffer serious damage.
Once a preheating time has elapsed (heating mode only), the cabinet interior reaches the
temperatures required for operation so that the other installed components can be added.
Distributed I/O device 6DL2804-1xxxx & 6DL2804-2xxxx
Hardware Installation Manual, 11/2023, A5E42025214-AC
NOTICE
Damage to seal or screwed glands
Make sure that the vent of the pneumatic system does not blow directly into the enclosure.
The pressure resulting in the enclosure would otherwise damage the seal and screwed
glands, and the degree of protection would no longer be provided.
5.5 Use of I/O device at temperatures down to -40 °C
Mounting
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