Flowserve LRR1-40 TDS Control Unit - Manual (Page 27)

27
System Faults
Causes
Malfunctions occur if CAN bus components have been mounted or configured incorrectly
or if electronic component parts are defective, or in the event of excessive heat in the
equipment or electrical interference in the supply system.
Malfunction alarms are set off by:
■ Fault in the conductivity electrode (internal connecting cable defective, temperature
sensor defective),
■ Measuring surface of electrode exposed,
■ Excessively high temperature in the electrode terminal box,
■ Faulty communication within the CAN-Bus system,
■ Failure of the 24V power supply unit.
If one of the first four malfunctions occurs, relay contact 1 (MAX limit) is opened and the
continuous blowdown valve closes.
For a more detailed malfunction analysis the operating and display device URB or
SPECTOR
control must be used. Please observe the respective installation manuals.
Test
When carrying out the individual tests please check:
Wiring:
Is the wiring in accordance with the wiring diagram?
Is the polarity of the bus line always correct?
Is the bus line of each of the end nodes provided with a 120
Ω
resistor?
Is the feedback potentiometer connected?
Conductivity electrode:
Is the measuring surface of the electrode permanently submerged?
Node ID:
Are the node IDs correctly set?
Note that a node ID must only be used for one item of equipment!
Baud rate:
Is the length of the cable in accordance with the adjusted baud rate?
Is the baud rate the same for all devices?
Danger
The terminal strip of the LRR 1-40 is live during operation. This presents
the risk of severe cases of electric shock! Cut off power supply before
installing or removing the equipment!
A B