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Operating Instructions
BA 373-E66
Technical specifications subject to change
W. Bälz & Sohn GmbH & Co.
Koepffstrasse 5
74076 Heilbronn
Germany
Phone +49 (0)7131 15 00 0
Fax +49 (0)7131 15 00 21
www.baelz.de
Observe copyright protection DIN 34
13.1 Check list for operational malfunctions
Figure 32: Check list for operational malfunctions
Malfunction
Actuator
will not operate.
Unsteady actuator
movement, i.e. moves
between OPEN and
CLOSED.
Linear actuator stops
temporarily.
.
Linear actuator does not
move to the end posi-
tion. Valve fails to open
/ close.
Linear actuator fails to move
or does not move correctly
to the position defined by the
input signal.
Cause
Power failure
Defective fuse
(in control cabinet)
Linear actuator incorrectly connected
Short-circuit caused by humidity
Short-circuit caused by incorrect connection
Motor winding damage, e.g., caused
by high voltage – defective electronics
Voltage drop due to connecting cables
being too long and / or with insufficient
cross-section
Power fluctuations exceed permissible
tolerance.
Loose contact in supply line
Valve jammed
System pressure too high
Poor input signal
- Interfering signals
- Signal variations
Main board defective
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 (on the
cover).
Determine the cause, dry the linear actuator,
replace cover seal and screw joints, and /or attach
protective cover, as required.
Connect correctly.
Determine the cause, measure current data, com-
pare with identification label and table, remove
linear actuators and return for repair.
Measure current data with linear actuator,
recalculate connecting cables and replace,
as applicable.
Improve power supply conditions.
Check and tighten connections (terminal strips).
Ensure smooth valve movement.
Adjust system pressure.
Check input signal at linear actuator, correct the
problem causing the malfunction.
Replace main board, if necessary remove actuator
and return for repair.