6.5.2 Behavior of the device when switched on
After application of the supply voltage and initialization, all device variants can immedi‐
ately be addressed by the SOPAS ET configuration software.
Table 13: Type-dependent behavior of the device when switched on at low temperatures
Variant Internal temperature of
housing
Behavior
RFU620-104xx
RFU620-105xx
Below –25 °C “Ready” LED continuously flashes
yellow. Device is not operational
because –25 °C is below the speci‐
fied minimum limit value.
–25 °C ... –20 °C “Ready” LED continuously flashes
green (warm-up phase). Device is not
operational (communication channel
still disabled) until the internal tem‐
perature has increased to –20 °C as
a result of the heat generated by the
electronics. Duration approx. 1 min.
RFU620-101xx Below –40 °C “Ready” LED continuously flashes
yellow. Device is not operational
because the temperature is below
the specified minimum limit value of
–40 °C.
–40 °C ... –20 °C “Ready” LED continuously flashes
green (heat-up phase). Device is not
operational (communication channel
still disabled) until the internal tem‐
perature has been increased to
–20 °C by the heater. Max. duration
5 min.
RFU620-104xx
RFU620-105xx
RFU620-101xx
From –20 °C “Ready” LED permanently lights up
green. The device has started regular
operation.
Once the supply voltage has been applied, the device uses integrated temperature sen‐
sors to measure its internal temperature. This is performed by all device variants while
booting.
RFU620-101xx
In addition, the device has an integrated heater that monitors its internal temperature
at regular intervals during operation. The device switches the heater off once it has
heated up to +5 °C, and switches it back on if the internal temperature drops to
–15 °C. A circuit protection device prevents the heater from overheating.
6 ELECTRICAL INSTALLATION
50
O P E R A T I N G I N S T R U C T I O N S | RFU62x 8015930/ZTM0/2018-11-06 | SICK
Subject to change without notice
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