holthausen
elektronik GmbH
Electronic Vibration Monitoring Unit
ESW
®
-Compact-Alu (hol610)
15. Self test
A self-test circuit in the unit is integrated to check the ESW
®
-Compact-Alu for correct
operation. The self-test function could be activated by switches inside the unit and is
optically displayed by a yellow LED. After expiration of fixed delay time has K1 and K2
to be switched, and the red LED “Alarm“ must light up. The analog output must give out
a current of over 22mA. During the self-test function is the whole electronic
incorporated, so that it’s possible to obtain a definite information about the function of
the unit.
Function
Switch position
S8
Self test on
ON
Self test off
OFF
Upon execution of the self-test function, it’s absolutely necessary to return the switch S8
to the position OFF in order to ensure the proper function of the ESW
®
-Compact-Alu.
The yellow LED must darken and current has to return to his normal value.
In case the yellow LED is lighting and a higher output current is flowing, without of
activation of S8, than the electronic recognize one sensor defect and starts alarm,
because the electronic is continuously monitoring the sensor.
External reset
The external reset connection (green cable) of the main alarm (relay K2), could be
connected trough a switcher or permanent with 0V potential of the power supply 24V.
If the green wire is permanently with 0V (ground) connected, an automatically reset of
the main alarm memory occurs as sun as the signal level after an alarm fall below of
the adjusted alarm level.
13
E S W -C o m p a c t
S6
S1
off
on
S2S3
S5
S4
S N :
R
LD2
LD1
P1
S7 S8
P2
LD3