ATEX
3.1 Safety and commissioning instructions for hazardous areas
SIRIUS 3RN2 thermistor motor protection relay
16
Manual, 10/2016, A5E34244868002A/RS-AA/001
A SIRIUS 3RN2 thermistor motor protection relay set to "automatic RESET" mode will be
reset automatically after the recovery time has elapsed, without the RESET button being
pressed. An additional ON button has to be used to ensure that the motor does not start up
automatically following tripping. You must not use "Automatic RESET" mode in applications
where there is a risk of personal injury or damage to property if the motor restarts
unexpectedly.
A risk analysis must be performed for the complete plant or machine. If this analysis yields a
lower hazard potential (category 1), all SIRIUS 3RN2 thermistor motor protection relays can
be used, provided the safety regulations are observed.
WARNING
Personal injury and damage to property
All connection, commissioning and maintenance work must be performed by qualified,
responsible personnel. Improper handling may result in serious personal injury and
considerable damage to property.
Cable routing
The measuring circuit cables must be routed as separate control cables. Use of cores from
the power supply cable of the motor or any other main supply cables is not permitted. If
extreme inductive or capacitive interference is expected as a result of power lines routed in
parallel, shielded control cables must be used.
Maximum length of sensor circuit cables for devices without short-circuit detection in the
sensor circuit:
Conductor cross section
3RN2000, 3RN2010
2.5 mm
2
2 x 2800 m
1.5 mm
2
2 x 1500 m
0.5 mm
2
2 x 500 m
Maximum length of sensor circuit cables for devices with short-circuit detection
1)
:
Conductor cross section
3RN2011, 3RN2012, 3RN2013, 3RN2023
2.5 mm
2
2 x 250 m
1.5 mm
2
2 x 150 m
0.5 mm
2
2 x 50 m
1)
Short-circuits in the sensor circuit are detected up to this maximum cable length.
Summary of Contents for 3RN2011
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