4 Technical Data
442
7SA522 Manual
C53000-G1176-C155-3
4.1.7 Climatic Stress Tests
Temperatures
1)
UL–certified according to Standard 508 (Industrial Control Equipment)
Humidity
4.1.8 Service Conditions
Standards: IEC 60255-6
Type tested (acc. IEC 60086-2-1 and -2, Test Bd, for
16 h)
–25 °C to +85 °C
Admissible temporary operating temperature (tested
for 96 h)
–20 °C to +70 °C or –4 °F to +158 °F (legibility of display may
be restricted from +55 °C or 131 °F)
Recommended for permanent operation (according to
IEC 60255-6)
–5 °C to +55 °C or 23 °F to +131 °F
If max. half of the inputs and outputs are subjected to the
max. permissible values
Limit temperatures for storage –25 °C to +55 °C or –13 °F to +131 °F
Limit temperatures during transport –25 °C to +70 °C or –13 °F to +158 °F
Storage and transport of the device with factory packaging!
1)
Limit temperatures for normal operation (i.e. output
relays not energized)
–20 °C to +70 °C or –4 °F to +158 °F
1)
Limit temperatures under maximum load (max. cont.
admissible input and output values)
–5 °C to +40 °C for
1
/
2
and
1
/
1
housing
Admissible humidity Annual average ≤ 75 % relative humidity;
on 56 days of the year up to 93% relative humidity. Conden-
sation is to be avoided during operation !
It is recommended that all devices be installed so that they are not exposed to direct sunlight nor subject to large fluc-
tuations in temperature that may cause condensation to occur.
The protection device is designed for installation in normal relay rooms and plants, so that electromagnetic immunity
is ensured if installation is done properly.
In addition the following is recommended:
• Contacts and relays operating within the same cabinet or on the same relay board with digital protection equipment,
should be in principle provided with suitable surge suppression components.
• For substations with operating voltages of 100 kV and above, all external cables shall be shielded with a conductive
shield earthed at both ends. For substations with lower operating voltages, no special measures are normally re-
quired.
• Do not withdraw or insert individual modules/boards while the protective device is energized. In withdrawn condi-
tion, some components are electrostatically endangered; during handling the ESD standards (for Electrostatic Sen-
sitive Devices) must be observed. They are not endangered when inserted into the case.
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