75.5933.04 ALLEGION HMSS 20190723
Page 11 of 12
TROUBLESHOOTING
Sensor will not set up
upon intial powering
Improper input voltage
Check terminals 1 and 2 for proper voltage (12 – 24 VAC / VDC
± 10%).
Sensor is in detection
Ensure field of detection is clear during set-up and all lenses are installed
on sensor. If detection is encountered upon initial set-up, the HMSS will
continuously flash green at ±2 Hz.
Permanent stationary objects are extremely close to the sensor. Ensure
that the detection field clear and the sensor is mounted properly (using the
HMSS Spacer, if necessary).
Potential interferences from
high-intensity lighting
Ensure no high-intensity lighting is in the immediate area of the sensor.
Change to a different frequency.
Data type mismatch (old/
new)
Verify that the data matches type LO21 or EDPS.
Door will not open once
set-up is complete
Sensor is in detection (red
LED is on)
Verify no changes in detection field made since set-up. If permanent
changes have occurred, launch a new set-up and re-test door (CAUTION:
THERE MAY BE NO SAFETY ON THE DOOR WHEN THIS TEST IS
PERFORMED).
Improper wiring
Remove output wires from the sensor. For controls using N.C. circuits, twist
together the relay wires.
Activate the door control. If the door opens, the fault exists with sensor
or related wiring. If door does not open, the fault may exist with the door
control or its related wiring.
Safety beams are in
detection
Disconnect green and blue wires from LO21 to the door control safety
and common terminals. If door opens when triggered, fault lies within
the lockout safety beam set, or possibly with the LO21. Refer to the LO21
troubleshooting procedures in the respective manual.
Improper relay output
configuration
Ensure proper relay output setting.
Sensor repeatedly
re-Learns environment
with each door position
Improper data from lockout
device
1) Allow door to open in automatic mode. Unlock sensor and launch a set-
up by pressing the Set-Up key, followed by the number 2. If the sensor LED
returns to red and does not begin flashing green, improper data exists.
2) If unsuccessful, allow the door to close. Unlock sensor and launch a set-
up by pressing the Set-Up key, followed by the number 2. If the sensor LED
flashes green, the lockout module needs replaced.
Refer to respective lockout User’s Guide for troubleshooting.
Data polarity at sensor is
incorrect
Verify that the negative wire from the lockout (white) is connected to
terminal 6, and the red/white wire from the lockout is connected at terminal
7.
HELPFUL HINT:
If faulty data is suspected, simply power the door to the
open position (by activation OR with the use of a “hold open” switch).
While the door is open, unlock the sensor and press the Set-Up key,
followed by the number 2. If the sensor LED returns to red and does not
begin flashing green, improper data exists. Refer to respective lockout
User’s Guide for troubleshooting.
Sensor is not reacting to
remote control
RC batteries are dead
Replace batteries.
Too much distance between
sensor and RC
Move closer to sensor during programming.
Data type mismatch (old/
new)
Verify data matches type LO21 or EDPS.
Unknown
Attempt manual programming procedure (page 7).
Visible Monitoring
Indication LED does
not flash
Monitoring installation /
set-up error
Verify monitoring is active in door control (active low).
Sensor malfunction
Replace sensor.
Monitoring DIP switch
is OFF
Verify DIP switch poisiton (must be switched to the left).
Visible Monitoring
Indication LED flashes
continuously
The DIP switch is set to ON
Place the monitoring DIP switch to the right (OFF).
