HORA MC55/24 - Check List for Breakdown

10 Removal of faults
Linear actuators MC100 • MC103
32 Version 2.1 - March 2011 Operating Manual
10.2 Check list for breakdown
Fault Cause/reason Remedy
1. Linear actuator is not
working.
Hand wheel (36) is in position manual mode  Switch hand wheel to position automatic
mode.
Power cut  Determine cause and remedy.
Fuse defective (in control cabinet)  Determine cause and remedy, replace
fuse.
Linear actuator incorrectly connected  Set connection correctly according to
wiring diagram (on cover).
Short circuit due to humidity  Determine cause, dry the linear actuator;
replace cover seal or screw joints and/or
attach protective cover, as required.
Short circuit due to incorrect connection  Correct setting for connection
Motor has winding damage (burnt-out)
• e.g. voltage too high
• Electronic system defective
 Determine cause, measure current data,
Compare to type plate and table,
Disassemble linear actuator and send it
in for repairs.
2. Linear actuator running
unsteadily, i. e.veering
between clockwise and anti-
clockwise rotation.
Drop of voltage due to excessively long
connecting cables and / or insufficient
diameter.
 Measure the current data; if required, re-
calculate and replace connecting cables!
Public power supply fluctuations greater
than admissible tolerance
 2.5 Technical data on page 10
 Improve public power supply conditions
3. Linear actuator pauses
intermittently or initialises
frequently
Slack contact in feeder line  Check and tighten connections (terminal
strips)
4. Linear actuator does not
move to limit position. Valve
does not open/close.
Valve is stuck  Provide smooth-running valve
Excessive system pressure  Adjust system pressure
5. Linear actuator does not
move at all or not correctly
to the position preset by
input signal Y
Input signal Y is faulty:
• Interfering signals
• Signal variations
 Check input signal Y on linear actuator,
remove cause of fault
Main PCB defective  Replace main PCB or disassemble
linear actuator and send it in for repair
6. LED flashes in long / long
rhythm
Blockage detection was triggered  Press INIT and observe actuator during
initialisation.
 Check valve for smooth-running along
entire traverse range
7. LED flashes in short / long
rhythm
Wire break was detected  Measure desired value voltage and
current on linear actuator
8. LED flashes in long / short
rhythm
Relay contact adhesive 
Check controller
table 8 Check list breakdown