19
Tools
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Screwdriver for slotted screws, size 2.5, completely insulated according to VDE 0680-1
n
Screwdriver for cross head screws, size 2
Electrical Connection
– continued –
Note
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The control units NRS 1-40.1 / NRS 1-40.2 can switch off different electric
circuits, e. g. the safety circuit for the heating system and the control circuit for
the feed pumps or circulation pumps.
n
Connect screen only to the respective terminals and to the central earthing point
(CEP).
n
The rated voltage is indicated on the name plate.
n
When switching off inductive loads, voltage spikes are produced that may impair the
operation of control and measuring systems. Connected contactors must therefore be
provided with suppressors such as RC combinations.
n
In the event of an alarm the signal output (terminal 7 and 8) is instantaneously closed.
n
In the event of a malfunction the signal output (terminals 7 and 8) is opened and
closed in a clock-pulse controlled way in order to ensure an optical differentiation
between an alarm and a malfunction signal. If required you can wire terminals 7 and 8
with an external signal lamp.
