HORA MC55/24 - Check List for Breakdown

10 Removal of faults
Linear actuators MC55
24 Version 3.3 - November 2014 Operating Manual
10.2 Check list for breakdown
Fault Cause/reason Remedy
1. Linear actuator is not
working.
Slide bar (34) in position manual mode  Switch the slide bar 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 the connection correctly according to
the wiring diagram (on the 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
 2.4 Technical data on page 9
 Improve public power supply conditions
3. Linear actuator pauses
intermittently or initialises
frequently
Slack contact in feeder line  Check connections (terminal strips /
connecting cables) and tighten, as
required.
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  Disassemble the linear actuator and
send it in for repair.
table 7 Check list breakdown