GESTRA NRS 1-50, Оригинальная инструкция по установке

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13 NRS 1-50 For TWO Electrodes - Installation Instructions -
818953-08
A signal output for the connection of further external signalling equipment is allocated to each
monitoring channel in the level switch, max. load 100 mA. For connecting the level switch with the
logic unit use a control cable, 2 x 0.5 mm
2
. In the event of an alarm or error message the signal
outputs (terminals 20, 21 and 29, 30) open instantaneously.
Connection for signal output
Electrical Connection
– continued –
Tools
n
Screwdriver for slotted screws, size 3.5 x 100 mm, completely insulated.
Danger
n
For the supply of the level switch NRS 1-50 with 24 V DC use a safety extra-low
voltage (SELV) power supply unit that must be electrically isolated from dangerous
contact voltages and must meet at least the requirements on double or reinforced
isolation acc. to EN 61010-1, EN 60730-1, EN 60950-1 or EN 62368-1
(safe isolation).
n
Any item of equipment that you want to connect to terminals 6, 7, 14, 15 (standby
input 1 / 2) must be certified to have at least double or reinforced isolation according
to EN 61010-1, EN 60730-1, EN 60950-1 or EN 62368-1 (safe isolation) between the
standby inputs and the live parts of the installation that are not supplied with safety
extra-low voltage (SELV).
Attention
n
Provide the level switch NRS 1-50 with an external semi-delay fuse 0.5 A.
n
Connect screens to terminals 5 and 13 and to the central earthing point
(CEP)
in the
control cabinet.
n
To protect the switching contacts provide the safety circuit with a slow-blow fuse 2 A
or 1.0 A (for 72 hrs. operation).
n
When switching off inductive loads, voltage spikes are produced that may impair
the operation of control and measuring systems. Connected inductive loads must be
provided with suppressors such as RC combinations as specified by the manufacturer.
n
When used as water level limiter according to EN 12952 / EN 12953 connect termi-
nals 24 and 26 by adding a wire link.
n
Install connecting lines to level electrodes and logic unit separated from power cables.
n
Do not use unused terminals as support point terminals.