Ec 34 (Relay Output) For Dc And Ac - Endress+Hauser nivocompact FTC 731 Installation And Operating Manual

Nivocompact FTC 731
Power Supply
Relay Contact for Load
Protection Against Voltage Peaks
and Short-Circuiting
Fig. 15
Connecting the Nivocompact with electronic
insert EC 34 (relay output)
F : Fine-wire fuse 200 mA, semi-time lag
1
recommended
F : Fine-wire fuse to protect the relay
2
contact, load-dependent
M: Ground connection to silo or to metal parts
near to the silo
E: Grounding
16
Connecting the Nivocompact with Electronic Insert EC 34
(Relay Output) for DC and AC
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.
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.
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.
Connection