Page 8 Copyright © 1995-97 Detection Systems, Inc. DS1520/30 Installation Instructions
Fault
Condition
false alarm
no alarm
Power supply
O.K.
Wiring fault
no
Wiring fault
no
C onnect meter
to test point.
Wait 2 minutes.
Scratch on
detector with
a screwdriver.
yes
yes
What is
the voltage?
Alarm
within 30 seconds?
no
Detector
malfunction
1520: E<0.3V
E>3V
1530: E>5V
E>1V
E<3V
E>0.3V
E<1V
Intermittent
disturbances
Scratch on
protected surface
with a
screwdriver
Disturbance
of detector
from outside
Cover
detector with
a sound
absorbing
material
no
Poor
mechanical
coupling with
surface,
tighten mounting
screws
Alarm
within 30
seconds?
yes
Check for
ultrasound
detectors
in the area.
Cause is
vibrations in
the protected
surface. Read
planning instructions.
voltage
nominal?
yes
no
(Re)adjust sensitivity
yes
Installation
OK
false
alarm?
yes
no
Power supply
O.K.
Detector
malfunction
Power supply range:
9-15 vdc
Less than 2 vac ripple
Normal voltage:
DS1520 0.7 vdc or less
DS1530 0.0 vdc
9.0 Troubleshooting Chart
