Situation 2
F
CDB/CDM
RFU6xx/RFH6xx
++
− −
+
V
S
−
+
−
1
4
2
2
+
3
−
−
−
F
CDB/CDM
RFU6xx/RFH6xx
+
+
−
−
+
V
S
−
+
−
a
1
4
2
2
3
Figure 31: Reversal of the polarity of the supply voltage with common system GND: Risk of dam‐
age to the RFID device!
1
Fuse in the connection module: 0.8 A (CDB620, CDM420-0001) or 2 A (CDB650-204,
CDM420-0006)
2
Blocking diode
3
Connection module
4
Battery
The housing of the RFID device is connected (see figure) in an electrically conductive
manner to the reference potential (system GND), which is also connected to the nega‐
tive pole of the applied supply voltage. Typical mounting location: Vehicle with chassis
as a common reference potential.
If the polarity of the supply voltage is reversed, this can lead to short-circuit currents
between the reversed positive and negative poles!
The fuse in the connection module is not located in the active circuit.
6.7.2 Supply voltage
The voltage supply or power supply unit must satisfy SELV requirements in accordance
with the currently applicable EN 60950-1. (SELV = Safety Extra Low Voltage).
NOTE
UL-certified devices (see type label) require a SELV/LPS-compliant supply voltage in
accordance with UL/IEC/EN60950-1 or Class 2 according to NEC, UL1310.
The voltage supply must be able to provide the following power outputs when the device
is operating at maximum transmitting power:
Table 15: RFU62x: required supply voltage V
S
Device variant Supply voltage V
S
Ambient operating
temperature
Power source: required power output
No load on either
switching output
Load on both switching
outputs (maximal
100 mA each)
RFU62x-101xx DC 10 V ... 30 V –20 °C ... +50 °C At least 10 W At least 15 W
DC 20 V ... 30 V –40 °C ... –25 °C At least 10 W and maxi‐
mum 12 W for the inte‐
grated heater
At least 15 W and maxi‐
mum 12 W for the inte‐
grated heater
RFU62x-104xx DC 10 V ... 30 V –25 °C ... +50 °C At least 10 W At least 15 W
ELECTRICAL INSTALLATION 6
8015930/ZTM0/2018-11-06 | SICK O P E R A T I N G I N S T R U C T I O N S | RFU62x
57
Subject to change without notice
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