SICK RFU63 Series - Page 50

Situation 1
+
−
RFU620-101xx
RFU620-104xx
RFU630/RFU650
RFH620/RFH630
F
CDB/CDM
+
−
+
V
S
−
−
1
2
3
2
F
CDB/CDM
RFU620-101xx
RFU620-104xx
RFU630/RFU650
RFH620/RFH630
++
−
+
−−
+
+
−
V
S
−
−
1
+
2
3
2
+
Figure 24: Reversal of the polarity of the supply voltage: no effect on the RFID device (see
requirements)
1
Fuse in the connection module: 2A (CDB650-204, CDM420-0006)
2
Blocking diode
3
Connection modules
The housing of the RFID device is connected to functional earth.
If the polarity of the supply voltage is reversed, the blocking diode blocks the negative
voltage on the positive pole of the RFID device.
NOTICE
The polarity reversal will not cause any damage provided the following two require‐
ments are met for the device:
•
The negative pole of the applied supply voltage is not connected to functional
earth as a common reference potential.
•
The device is not connected in an electrically conductive manner to any other
peripheral devices that use the same reference potential, neither through its metal
housing or over other cables (signal relative to GND, shielding).
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 | RFU63x 8027750//2022-12-15 | SICK
Subject to change without notice