GESTRA NRS 1-40, Original Installation Manual

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Attention
n
Wire equipment in series. Startype wiring is not permitted.
n
Interlink screens of control cables such that electrical continuity is ensured and
connect them
once
to the central earthing point (CEP). If equipotential currents may
occur, e.g. in outdoor installations, separate the screen from the central earthing point
(CEP).
n
To protect the switching contacts fuse circuit with 2.5 A (slow blow) or according to
TRD regulations (1.0 A for 72 hrs operation).
n
If more than one system component is connected to a CAN bus network provide the
first and last equipment with a terminating resistor of 120 Ω.
Fig. 10, Fig. 11
n
Use only one waterlevel limiting system per CAN bus network.
n
The CAN bus line must not be interrupted while operating with one or more system
components.
In the event of an interruption the safety circuit will be opened!
If the switching controller has to be replaced first remove the terminal strips 0 , Fig. 3
Note
: Make sure that all system components connected are not operating before
removing the CAN bus line from the terminal strip.
Electrical Connection
– continued –
CAN bus wiring diagram
Fig. 12
RES 2
CEP*)
NRS, NRR, LRR,
TRS, URB 1
URB 2 NRG, LRG,
EF, URZ
TRV
RES 1
*) Central Earthing Point