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Motorized Rotary Actuator
10.1 Checklist for operational malfunctions
Malfunction
Actuator not working
Actuator running erratically,
constantly opening and
closing
Actuator stops intermittently
Actuator does not move to
end position. Valve fails to
open / close
Rotary actuator fails to
move or does not move
correctly to the position
defined by the input signal.
W. Baelz & Sohn GmbH & Co. · Koepffstrasse 5 · 74076 Heilbronn · Germany · www.baelz.de
Cause
Power failure
Defective fuse (in control cabinet)
Rotary actuator incorrectly connected
Short circuit caused by humidity
Short circuit caused by incorrect connection
Motor winding damage caused, for example,
by high voltage or defective electronics
Voltage drop due to connecting cables being
too long and / or having insufficient cross-
section
Power fluctuations exceed permissible
tolerance
Loose contact in supply line
Valve jamming
System pressure too high
Poor input signal
- interfering signals
- signal fluctuation
Circuit board defective
baelz 375-E42
Action required
Determine the cause and correct the
problem.
Determine the cause and correct the
problem, replace the fuse.
Re-connect as specified on circuit
diagram (inside cover).
Determine the cause, dry the rotary
actuator; if necessary, replace cover
seal and screws and/or fit protective
cover.
Connect correctly.
Determine cause, measure current
data, compare with nameplate and
specifications, dismantle rotary
actuator and return for repair.
Measure current data with rotary
actuator, recalculate connecting
cables and replace as necessary.
Improve power supply conditions.
Check and tighten connections
(terminal blocks).
Enable smooth valve movement.
Adjust system pressure.
Check input signal at rotary actuator,
correct the problem causing the
malfunction.
Replace circuit board, if necessary
dismantle actuator and return for
repair.
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