Flowserve NRS 1-40 - Manual (Page 10)

10
■ Wire equipment in series. Star-type wiring is not permitted.
■ Interlink screens of control cables such that electrical continuity is
ensured and connect them once to the central earthing point (CEP).
■ 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).
■ 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. 2
■ Use only one water-level limiting system per CAN bus network.
■ The CAN bus line must not be interrupted while operating with one or
more system components.
An interruption will result in disconnection caused by a
malfunction.
If the switching controller has to be replaced be sure to remove first the
terminal strips , Fig. 4
Note: Make sure that all system components connected are not
operating before removing the CAN bus line from the terminal strip.
Wiring
– continued –
Attention
Note
■ Connect screen only to terminal 3, ensuring electrical continuity and
connect equipment once to the central earthing point (CEP).
■ The loop resistance must be under 10
Ω
.
■ The rated voltage is stated on the name plate.
■ When switching off inductive loads, voltage spikes are produced that
may impair the operation of control and measuring systems. Inductive
loads should therefore be provided with commercial arc suppressor
RC combinations, e. g. 0.1 µF / 100
Ω
.
■ Despite correct wiring H. F. interference caused by the installation may
lead to system breakdowns and malfunction messages. If necessary
refer to the “Fault finding list for troubleshooting” on page 23.
■ In the event of a shut-down due to a malfunction the signal output
(terminals 7 and 8) is cyclically opened and closed in order to ensure an
optical distinction between “Low-level alarm” (signal output closed) and
“Malfunction shut down”.
If necessary connect terminals 7 and 8 externally to an indicator lamp,
Fig. 1.
A
Wiring Diagram
Wiring diagram see page 3.