Flowserve NRR 2-40 - Manual (Page 11)

11
Wiring
– continued –
Attention
■ 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.
■ If more than one system components are connected to a CAN bus
network provide the first and last equipment with a terminating
resistor of 120
Ω
. Fig. 4
■ 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 to avoid malfunction alarms.
■ Screwdriver for slotted screws, size 2.5, completely insulated according to
VDE 0680.
Tool
Note
■ Connect screen only to designated terminals.
■ 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.
■ 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
pages 26 and 27.
A