GESTRA NRS 1-40, Original Installation Manual

Page: 34 / 40

34
System Malfunctions
– continued –
Error message 3
– continued –
Hold down button .
LED 2 flashes rapidly.
Fault : Bus lines C
L
and C
H
are interchanged.
Remedy: Connect bus lines according to the wiring diagram.
Fault: The operating mode setting is not correct: Water level limiter ( one level electrode)
or water level limiting system ( two electrodes).
Remedy: Check and, if necessary, correct the settings in the switching controller and
the sensor.
Fault:
The data transfer between level switch and electrode is interrupted.
Remedy:
Make sure that the bus lines are wired in accordance with the wiring diagram
(observe polarity). All endofline devices must be provided with a terminating
resistor of 120 Ω! (see wiring diagram).
Cut off power supply and restart the system after 5 sec.
Fault:
The baud rate of one or more bus devices is not set correctly.
Remedy:
Check baud rate settings of all bus devices.
The baud rate settings must be identical.
Cut off power supply and restart the system after 5 sec.
Fault: The overall length of the bus line does not correspond to the baud rate setting.
Remedy: Change baud rate settings of all bus based equipment.
Cut off power supply and restart the system after 5 sec.
Fault: In spite of correct wiring and commissioning of the equipment an interference
signal is indicated.
Remedy: The interference signal is caused by H. F. interferences coming from the installation.
For interference suppression of the voltage supply we supply ferrite rings, stock code
147253. The 230 V supply lines should be looped through the ferrite ring five to ten
times. If several controllers are used in the system, they can be fed from the
interference suppressed supply lines. For the interference suppression of the
bus line we supply hingedshell ferrite rings, stock code 147254.
The hingedshell ferrite rings are clamped onto the bus line close to the
terminal strip of the controller. Restart the system after installation.
B