BA_375-E42_01_DEF_MJ_4419
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W. Baelz & Sohn GmbH & Co.
· Koepffstrasse 5 · 74076 Heilbronn · Germany ·
www.baelz.de Seite | Page
Motorized Rotary Actuator
baelz 375-E42
Malfunction
Cause
Action required
Actuator not working
Power failure
Determine the cause and correct the
problem.
Defective fuse (in control cabinet)
Determine the cause and correct the
problem, replace the fuse.
Rotary actuator incorrectly connected
Re-connect as specified on circuit
diagram (inside cover).
Short circuit caused by humidity
Determine the cause, dry the rotary
actuator; if necessary, replace cover
seal and screws and/or fit protective
cover.
Short circuit caused by incorrect connection Connect correctly.
Motor winding damage caused, for example,
by high voltage or defective electronics
Determine cause, measure current
data, compare with nameplate and
specifications, dismantle rotary
actuator and return for repair.
Voltage drop due to connecting cables being
too long and / or having insufficient cross-
section
Measure current data with rotary
actuator, recalculate connecting
cables and replace as necessary.
Actuator running erratically,
constantly opening and
closing
Power fluctuations exceed permissible
tolerance
Improve power supply conditions.
Loose contact in supply line
Check and tighten connections
(terminal blocks).
Actuator stops intermittently
Valve jamming
Enable smooth valve movement.
Actuator does not move to
end position. Valve fails to
open / close
System pressure too high
Adjust system pressure.
Poor input signal
- interfering signals
- signal fluctuation
Check input signal at rotary actuator,
correct the problem causing the
malfunction.
Rotary actuator fails to
move or does not move
correctly to the position
defined by the input signal.
Circuit board defective
Replace circuit board, if necessary
dismantle actuator and return for
repair.
10.1 Checklist for operational malfunctions
