Ingersoll-Rand LCN 7940-8770 - Manual (Page 11)

75.5255.02 XXXXXXXX
7940-8770 LCN
Page 10 of 11
TROUBLE-
SHOOTING
PRESENCE
SENSOR DEPTH
PATTERNS -
Cont.
Row 1 (spots 1 through 6), are on during open door position and off during closed door position.
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Presence Sensor will not
set-up upon initial powering
PROBLEM PROBABLE CAUSE CORRECTIVE ACTION
1. Check terminals 1 & 2 for proper voltage
24 V AC/DC + 10%.
2. Make certain that the field of detection is all
clear during the set-up and that all lenses
are installed on the Presence Sensor. If
detection is encountered upon initial set-up,
the Presence Sensor will continuously flash
Green at + 2 Hz. The Presence Sensor will
also not set-up if permanent stationary
objects are extremely close to the sensor.
Ensure that, not only is the detection field all
clear, but that the sensor is mounted
properly (using the Presence Sensor
mounting block if necessary).
3. Ensure that no high intensity lighting is in
the immediate area of the sensor.
1. Improper input voltage
2. Presence Sensor is in detection
3. Potential interferences from high
intensity lighting
Door will not open once set-
up has been completed. 1. Presence Sensor is in detection.
2. Improper wiring
3. Lockout safety beams are in
detection
4. Improper relay output configuration
1. Ensure that there is no detection occurring
at the Presence Sensor. If the Red LED is
on steady, there is detection. Make sure
there have been no changes in the field of
detection since set-up. If permanent
changes have occurred, launch a new set-
up and re-test door.
2. Remove the output wires (common,
normally open, normally closed) from the
Presence Sensor. CAUTION – there may
possibly be no safety on the door when
this test is performed. Activate the door
control, if the door opens, the fault exists
with Presence Sensor or related wiring. If
door does not open, the faults may exist
with the door control or it’s related wiring.
3. Ensure proper relay output setting. Refer to
page 6. Typically, relay setting should be
“Normally Open”. This means the relay
would close upon detection.
(4) Deep Without Row 1 (5) Middle Without Row 1 (6) Limited Without Row 1