Flowserve LRR1-40 TDS Control Unit - Manual (Page 29)

29
System Faults
– co ntinued –
Fault finding list for troubleshooting system faults
LED 1- 3 (4 for MIN limit) are flashing rapidly
Fault: The initialising phase has not been finished during start-up.
No communication with conductivity electrode.
Remedy: Check installation. Check and, if necessary, change node ID and baud rate
setting. If modifications have to be made, switch off the mains voltage and
switch it on again after about. 5 seconds.
LED 1- 3 (4 for MIN limit) are flashing slowly
Fault: Measuring surface of conductivity electrode is exposed.
Remedy: Check installation and make sure that the measuring surface is submerged.
Fault: Internal wires of the conductivity electrode are defective or the temperature
sensor failed.
Remedy: Replace conductivitiy electrode.
Fault: The temperature in the terminal box of the conductivity electrode exceeds
the max. limit.
Remedy: Check installation of electrode and, if necessary, protect the equipment
against excessively high temperatures. As soon as the temperature falls
below the max. admissible limit, the equipment switches back to operating
mode.
LED bus status is flashing slowly
Fault: Faulty communication in the CAN-bus system. Malfunction cannot be
acknowledged by pressing button
.
Remedy: Check 24V bus supply, wiring, node ID, baud rate setting and terminating
resistors. If modifications have to be made, switch off mains voltage and
switch it on again after about 5 seconds.
Fault: No or faulty communication with conductivity electrode. The fault occurs at
longer intervals and can be acknowledged by pressing button
.
Remedy: There is a source of interference in the surrounding area. Take corrective
action, e. g. suppress interference of valve actuators with 22nF/220
Ω
. Take
action against high frequency interference. After the remedial action
acknowledge the interference suppression by pressing button
.
LED Power is flashing slowly
Fault: 24 V power supply unit in controller failed.
Remedy: Replace controller.