Endress+Hauser nivocompact FTC 831, Инструкция по установке и эксплуатации

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Connecting the Nivocompact with Electronic Insert EC 44
(Relay output) for DC and AC
Power Supply With AC, it is unimportant whether L1 or N is connected to Terminal 1.
With DC, it is unimportant whether L+ or L– is connected to Terminal 1.
Relay Contact for Load The load is connected over a potential-free relay contact (change-over
contact).
The relay contact breaks the connection between Terminal 3 and Terminal 4
on level alarm or with a power failure.
Protection Against Voltage Peaks
and Short-Circuiting Protect the relay contact by connecting a spark barrier to instruments with
high inductance.
A fine-wire fuse (load-dependent) can protect the relay contact if a
short-circuit occurs.
Fig. 13
Connecting the Nivocompact with electronic
insert EC 44; (relay output)
F
1
: Fine-wire fuse 200 mA, semi-time lag,
F
2
: Fine-wire fuse to protect the relay
contact, load dependent
M: Ground connection to silo or
metal parts near to the silo
E: Grounding
Connection
17