Flowserve NRS 1-42 - Manual (Page 11)

11
■ 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 T 2.5 A or
according to TRD regulations.
■ 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
■ The CAN bus network must not be interrupted while operating.
Any interruption will result in HIGH /LOW level alarm!
If the level controller must be replaced, remove terminal
strip Fig. 6.
Before removing the CAN-bus line from the terminal strip disconnect all
relevant system components.
Wiring
– continued –
Attention
Note
■ Connect screen only to terminal 3, ensuring electrical continuity and
connect it 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.
■ In spite of 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 21.
Tool
■ Screwdriver for slotted screws, size 2.5, completely insulated according to
VDE 0680.
A