RHE21 Installation & Startup Guide – Doc. No. 8.2.1.04 – Ver. 1.31
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Power Supply, Grounding and I/O Connections Overview
For connections longer than 0.5m shielded cables should be used. For connections longer than
3m, additional ferrite filter beads close to the RHE are recommended for avoiding RF EMI.
The power supply input is protected by a fuse. As a protection against fire in case of a short in
the cable, the supply side of the cable should be protected by a fuse (see figure 7, SI1) with a
rating not higher than the current carrying capacity of the cable.
For RHE21 constructions types E* the power supply and I/O connections are located in the
terminal box shown in Figure 5. The available I/O connections depend on the I/O configuration
option of the RHE21.
Figure 5: RHE21 Types E* with Terminal Box for Power Supply, I/O Connection and optional Layout
For RHE21 constructions types H* the power supply and I/O connections are located in the
housing of the transmitter as shown in Figure 6. The upper part of the housing has to be screwed
off for connection and the wires must be put through the two cable entries using suitable cable
glands.
Figure 6: RHE21 Types H* with integrated Connectors for Power Supply and I/O Connection
I/O
power
supply
Summary of Contents for RHE21
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