Flowserve NRS 1-42 - Manual (Page 8)

8
Function
At regular intervals the level electrode NRG 16-42 sends a data telegram to the level
switch NRS 1-42. The data transfer is effected by means of a CAN bus according to
DIN ISO 11898. The transferred measuring data are then evaluated and assigned to
the manually adjusted switchpoints. To guarantee the correct functioning and safety
of the system the data transmitting cycle of the level switch is constantly monitored
by the level switch. When the CAN bus line is interrupted the level switch sends a
visual signal to indicate a malfunction and the relays 1 and 4 will be instantaneously
de-energized (fail-safe position).
Additional functions, such as (de-)energizing delay times of the output relays
(1 to 25 seconds), can be adjusted with the control terminal and display unit
URB 1.
Explanatory Notes
Scope of supply
NRS 1-42
1 Level switch type NRS 1-42 (plug-in unit in plastic case with terminals)
1 Terminating resistor 120
Ω
1 Installation manual
System description
Use level switch type NRS 1-42 together with level electrode type NRG 16-42 for
level monitoring. The level switch has the following functions:
■ Four levels with one switchpoint each.
■ High-level alarm, low-level alarm, pump
ON
, pump
OFF
with one switchpoint each.
The level data are transferred from the electrode NRG 16-42 to the level switch via a
CAN bus.