ABB RHD Series - 8 Troubleshooting; LED Signals at Commissioning and Service Field

RHD250 to 4000 (Contrac) ELECTRICAL ROTARY ACTUATOR | SEI/RHD250/4000-EN REV. A 31
8 Troubleshooting
LED signals at commissioning and service
field
Provided the electronic unit is supplied with voltage (green LED
on LCP ‘ON’), the red LED on the commissioning and service field
provide some basic status information:
Both LED are ‘OFF’
Actuator is ok
B
oth LED are ‘ON’ Actuator is in bootstrap mode (e. g. during data
loading procedure); in this case the actuator is not
available for the positioning loop.
B
oth LED flash
S
imultaneously
Actuator end positions are not set; actuator does not
accept commands
to the digital inputs and can only be
moved via drive buttons on the local control panel (see
also electronic unit instruction).
B
oth LED flash
alternatively
Actuator failure (e. g. out of adjusted range); actuator
cannot be moved via command buttons or commands
from the process control system; reset is only possible
once the failure reason is eliminated.
Figure 55: Commissioning and service field
9 Troubleshooting
NOTICE
Check wiring, polarity and all plug and terminal connections
before you start detailed trouble shooting.
The following chapter specifies various possible failure events or
conditions, which should be checked.
Follow the block diagrams to find the associated reason, result
or measure to solve the malfunction.
Example:
Condition
E6.1
LED signal: Failure
Possible failure
E6.3
Sensor memory failure
O
ne reason / measure to
solve the malf
unction
R6.2
Replace sensor; see
Exchange of position
sensor on page 27
(in this case the user will
find more detailed
information about the
sensor replacement in
Exchange of position
sensor on page 27).