35
System malfunctions
- continued -
LED bus status is flashing slowly
Error message 3
Fault:
The data transfer between the control unit and the electrode is interrupted!
Remedy:
The wiring of the bus lines must be in accordance with the wiring diagram
(observe polarity). As specified in the wiring diagram provide the end-of-line bus
devices with 120 Ω terminating resistors.
Cut off power supply and restart system after 5 sec.
Fault:
Incorrect baud rate setting for one or more bus devices.
Remedy:
Check the baud rate settings of all bus-based devices.
The baud rates
must
be identical!
Cut off power supply and restart system after 5 sec.
Fault:
The total length of the bus line does not correspond to the baud rate setting!
Remedy:
Check the baud rate settings of all bus-based devices.
Cut off power supply and restart system after 5 sec.
Fault:
In spite of correct wiring and commissioning of the equipment an error message is
indicated.
Remedy:
The error message is caused by the high-frequency interference coming from the
system. For interference suppression we supply ferrite rings, stock code # 147253.
The 230 V supply lines should be looped five to ten times through the ferrite ring.
If several controllers are used in one 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 lines near the terminal strip of the control unit. Restart system
after installation. There is a source of interference in the surrounding area.
Take corrective action, e. g. suppress interference of valve actuators with 22 nF / 220 Ω.
Restart system after installation.
1
2
3
4
Test
P
1
2
3
E
4
µS
ppm
GESTRA
LRR 1-40
