Failure detection
22
Electrical Linear Actuators for Continuous Modulating Control LME620AI / LME620AN (Contrac)
43/68-13 EN
9
Failure detection
9.1
LED signals at local control panel
Provided the electronic unit is supplied with voltage (green LED on LCP „ON“), the red LED on the local
control panel provide some basic status information:
both LED are „OFF“
actuator is ok
both 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
both LED flash simultaneously actuator end positions are not set; actuator does not accept com-
mands to the digital inputs and can only be moved via drive buttons on
the local control panel (see also electronic unit instruction)
both LED flash alternatively
actuator failure (e. g. out of adjusted range); actuator can not be moved
via command buttons or commands from the process control system;
reset is only possible once the failure reason is eliminated
Fig. 27: Local Control Panel
10
Trouble Shooting
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
one reason / measure to solve the malfct.
R6.2
replace sensor; see chpt. 7
(in this case the user will find more detailed in-
formation about the sensor replacement in
chapter 7)
(68d_0110)
