iso415R-x_D00401_00_M_XXEN / 04.2021 27
ISOMETER® iso415R
6
Error – Cause – Error correction
Error pattern
Cause
Correction
Source
RS-485
Unstable system
Missing termination due to incorrect
commissioning or defective component.
No device is terminated.
Configure the terminating resistor, determine
the terminating resistor value and replace it if
necessary.
Faulty termination due to incorrect
configuration or defective component.
Only one or more than two devices are
terminated.
Configure the terminating resistor, check quality
of the bus signal.
Missing bias resistors in the master device
Installation and configuration of the missing
bias resistors.
No communication
Incorrect configuration: different baud
rates between bus devices.
Calibrate baud rates between all bus devices.
Incorrect connection: terminals A and B
are mixed up.
Establish correct bus wiring.
Alarm relays
Relays do not energise No alarm message due to defective com-
ponent or defective controlling devices.
No alarm source has been assigned.
Check relay for proper function,
replace device if necessary.
Assign alarm sources.
Relays do not de-en-
ergise
No alarm reset due to sticking or defective
relay. Switching current > 5 A.
Replace device, if necessary. Observe technical
data of the switching output.
No switching of the relay due to excessive
preloads on contacts.
Observe technical data of the switching output.
Enclosure
Broken screw-mount-
ing brackets
Device becomes detached due to broken
mounting brackets.
Preventive measure: Use correct screw type and
observe max. tightening torque.
If the screw-mounting brackets are defective:
mount on DIN rail or replace device.
Non-compliance
with the insulation
guideline
Insufficient insulation due to insufficient
distance between mounting screws and
connecting wires.
Use screws with plastic cover or mount on DIN
rail.
Terminals
Wires detach from the
terminal
Due to splicing of wire ends, it is not
possible to insert them into the terminal
or hold them firmly in the terminal.
Use ferrules for mounting and connection to
flexible cables.
Wires cannot be re-
moved from terminal
Ferrules with strong crimp impressions
get stuck in the terminal
Use correct crimping pliers for mounting and
connection with flexible cables.
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