GESTRA NRS 1-40, Оригинальное руководство по установке

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21
Electrical Connection
– continued –
Tools
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Screwdriver for slotted screws, size 2.5, completely insulated according to VDE 06801
Note
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Connect screen only to terminal 3, ensuring electrical continuity and connect equip
ment once to the central earthing point (CEP).
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The loop resistance must be under 10 Ω.
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The rated voltage is stated on the name plate.
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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 RC combinations, e. g. 0.1 µF / 100 Ω.
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Despite correct wiring system failure and malfunction messages may occur because
of high frequency malfunctions caused by the system. For more information refer to
the section “Troubleshooting”.
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In the event of a shutdown caused by 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 “Low water level” (signal output permanently closed)
and “Shut off due to a malfunction”. If required you can wire terminals 7 and 8 with
an external signal lamp, Fig. 8 .
CAN bus
All level and conductivity controllers and associated electrodes are interconnected by means of a CAN
bus adopting the CANopen protocol. Every item of equipment features an electronic address (Node ID).
The fourcore bus cable serves as power supply and data highway for highspeed data exchange.
The CAN address (Node ID) can be set between
1 and 99 .
The NRS 140 is configured at our works and ready for service with other GESTRA system components
without having to set the node ID.
If several systems of the same kind are to communicate in one CAN bus network, be sure to
assign one node ID for each individual system component (e. g. controller).
If the length of the CAN bus cable exceeds 125 m, use code switch
9 to change the switch
positions.
For more information refer to the section “Basic Settings – Code switch settings”.
Basic Settings