www.ismacontrolli.com
pag. 7
DBL561en | 1
st
Issue rev. c | 03/2022
DIAGNOSTIC - ALARM FUNCTIONS
N°
LEDS
BEHAVIOUR
ERROR
ACTUATOR
USE
ACTUATOR BEHAVIOUR
TYPICAL
TROUBLE
SHOOTING
CONDITION
RESET
PROCEDURE
AUTOMATIC CALIBRA-
TION
(DIP N. 7 OFF)
MANUAL CALIBRATION
(DIP N. 7 ON)
1
RED ON
Valve stroke
less than
5mm
Calibration/
first instal-
lation
The actuator pushes/
pulls 2 times (unexpected
stall) trying to remove the
possible obstacle. After 2
tries an alarm is signalled
and the actuator moves
to initial position and
does not respond to con-
trol signal. Stroke value is
not updated because out
of range
The actuator pushes/pulls
2 times against endpoint
during calibration and the
actuator moves to the
initial position and then it
does not respond to the
control signal. The actua-
tor keeps the previous
stroke
Valve with a
stroke length
lower than
5mm
Remove
power and
power up
again
2
RED LED
quick
bl
GREEN ON
Stroke
longer than
60mm
Calibration/
first instal-
lation
The actuator exits the
60mm stroke range and
it moves toward the new
stroke limit signalling an
anomaly. The actuator pu-
shes/pulls 2 times against
the new stroke limit, then
it goes back to the initial
position still signalling
the anomaly until it is not
within 60mm. The actua-
tor does not calibrate the
stroke after 10s (wrong
range)
The actuator exits the
60mm stroke range and
it moves toward the new
stroke limit signalling an
anomaly. The actuator pu-
shes/pulls 2 times against
the new stroke limit, then
it goes back to the initial
position still signalling
the anomaly until it is not
within 60mm. The actua-
tor does not calibrate the
stroke after 10s (wrong
range)
Valve with a
stroke length
longer than
60mm
Remove
power and
power up
again
3
RED Quick
Blinking
Unexpected
stall within
the calibra-
ted stroke
range
normal
operation
The actuator tries 5 times
against the new stall con-
dition and then after 10s
the actuator updates the
new stroke length
The actuator tries 5 times
against the new stall
condition. At the end of
the attempts the fault will
be signalled. The actuator
does not update the new
stroke length, but after
60s makes other attempts
to verify the stall condi-
tion
Valve stuck
Inverted
control
signal
4
RED Quick
Blinking
Stroke
longer than
expected
Normal
operation
The actuator moves
toward the new stall con-
dition with a lower speed;
after 10s the actuator
updates the new stroke
value
The actuator moves
toward the new stall con-
dition with a lower speed;
after 10s the actuator
does not update the new
stroke value
Stem
connection
loose or valve
damaged
Inverted
control
signal
5
RED slow
Blinking
Low Power
Voltage
Normal
operation
The actuator is still
working but performance
cannot be guaranteed
The actuator is still
working but performance
cannot be guaranteed
1. Wrong
transformer
size
Correct Vol-
tage Power
2. Unstable
power
6
RED slow
Blinking
High Power
Voltage
Normal
operation
The actuator is still
working but performance
cannot be guaranteed
The actuator is still
working but performance
cannot be guaranteed
1. Wrong
transformer
size
Correct Vol-
tage Power
2. Unstable
power
