SDC MD-31DOW Security Door Controls Instruction Manual
- June 4, 2024
- SDC
Table of Contents
SDC MD-31DOW Security Door Controls
Application
The MD-31DOW combines a passive-infrared detector with relay output to allow
control of door ingress and egress in request-to-exit (REX) applications. It
is UL Listed as an access control device under the UL 294 standard. It is for
indoor use only. MD-31DOW is not designed for use as the primary means of exit
for emergency egress.
MD-31DOW can be ceiling or wall mounted over the door and the detection
pattern can be tailored via vertical aim adjustment and/or masking of the
detection pattern.
The relay outputs consist of two Form “C” contacts that can be adjusted to
latch from 0.5 seconds to 64 seconds. Resettable or non-resettable can be
selected for the latch time. The relay can also be programmed to fail safe
(doors unlocked) or fail secure (doors locked) mode in the event of a power
loss.
Product specifications
- Voltage input: 12 VDC or VAC; 24 VDC or 24VAC
- Current draw: 16mA @ 12VDC (see Current Ratings on page 4)
- NO INTERNAL BATTERY. Budget 38mAh per hour standby
- REX detector output: 2 Form C relay contacts rated 2A 30VDC/VAC maximum for DC resistive loads
- Indicator: Green LED for PIR detection
- Relay latch duration: Adjustable from 0.5 seconds to 64 seconds
- Timer modes: Selectable for resettable (cumulative) or non-resettable (counting)
- Power loss operation modes: Selectable for fail-safe (doors unlocked) or fail secure (doors locked)
- Mounting locations: Above controlled door(s), on the door frame, wall, or ceiling
- Mounting height: 7’ to 15’
- Housing: High-impact ABS plastic
- Dimensions: 7”W X 1.75”H X 1.88”D (178W X 44H X 48D mm)
- Operating temperature: -20°F to 120°F (-29°C to 49°C); RH: 0-85%
- RFI immunity: 26MHz to 1000 MHz @ 50 V/m (FCC)
Wiring
All wiring connections should be made and verified before any power is
connected to the detector. All power, including standby battery if used,
should be disconnected.
Connect wires to terminals as follows
Use EMF (voltage) spike-protected relay
when connecting inductive loads to the detector to protect against possible
harmful EMF spikes.
Use Non-EMF (voltage) spike-protected relay
for non-inductive loads. When connecting an inductive load to this relay that
is not spike protected, use either a 1KV 1A diode or a 100V, 4A bridge
rectifier (See illustration below). Otherwise, relay life may be shortened.
NON-EMFSPIKE-PROTECTED RELAY
Most UL 1034 listed magnetic locks are already EMF spike-protected and therefore do NOT require a diode or bridge rectifier, and adding either could cause response delays. Check magnetic lock specifications.
Choose either Fail Safe or Fail Secure operation and wire to either EMF or
Non-EMF contacts as follows
DIP switch settings
Selectable operational settings for the detector are programmed via the six
(6) DIP switches on the circuit board and accessible with the detector cover
removed. Switches are in the on position when the raised part (shown as white
below) is in the upward position toward the word “ON,” and are in the off
position when the raised part is in the downward position toward the switch
number. Shown below are switches 1-5 in the ON position and switch 6 in the
OFF position
The following operational settings must be selected:
DIP SWITCH 1-Resettable/Non-resettable timer selection
DIP Switch 1 selects either relay reset at the end of latch time (“Non-
Resettable”) or latch time extension upon additional motion (“Resettable”).
Non-resettable-switch OFF: After motion initially activates the relay,
the relay will deactivate when the latch time ends even if there is additional
motion. This setting is suitable for use with access control systems.
Resettable-switch ON: After motion initially activates the relay, each
additional detection of motion causes the latch timer to restart.
Only when there is no longer move and the latch time Is allowed to expire will
the relay deactivate. This setting is suitable for bypassing 24-hour contact.
DIP SWITCH 2-Fail Safe/Fail Secure relay mode selection
DIP Switch 2 selects either Fail Safe (doors unlocked) or Fail Secure
(doors locked) operation in the event of a power failure. The setting selected
must comply with all applicable regulations and be verified by the local AHJ
(Authority Having Jurisdiction).
Fail Safe-switch ON: In the event of a power failure, the relay causes
the locking mechanism (such as door strike or magnetic lock) to unlock.
Fail Secure-switch OFF: In the event of a power failure, the relay causes
the locking mechanism (such as door strike or magnetic lock) to remain locked.
Use this setting only with AHJ approval as life safety can be affected. In
addition, ensure there is no interference with the functioning of any panic
devices associated with the system MD-31DOW is connected to.
DIP SWITCH 3-LED Enable/LED Disable selection
DIP Switch 3 selects either the LED to light upon detection of motion or
remain off. It Is recommended not to select disable pr10r to walk testing the
detector as it can provide visual feedback of detector coverage pattern.
LED Enable-switch ON: LED lights upon detection of motion.
LED Disable-switch OFF: LED remains off.
DIP SWITCHES 4, 5, and 6-Latch Time selection
DIP Switch 4, 5, and 6 are used in combination to select the duration of the
relay latch time after the relay is activated by motion detection. Use the
following chart to select a latch time from 0.5 seconds to 64 seconds:
____TIME (Seconds) SWITCH 4 _SWITCH 5 SWITCH 6_
0.5 (Default) _OFF OFF_ __OFF
1 _OFF OFF_ __ON
2 _OFF ON_ __OFF
4 _OFF ON_ __ON
8 _ON OFF_ __OFF
16 _ON OFF_ __ON
_32 ON_ _ON OFF
_ 64 ON ON ON
Installation
Remove the cover of the detector by inserting a flat head screwdriver into the
slot visible (at the extreme end opposite the end with the PIR lens) on the
back of the detector and prying it off. Follow instructions for wiring and DIP
switch settings.
Route wires through the wiring entrances on the left side of the detector. For
surface wiring, carefully cut out the breakaway notch provided on the cover at
the same end as the wire entrances appear on the base. The detector can be
mounted from 7ft to 15 ft. (2.1m to 4.6m) above the floor. Mounting height
affects the detection pattern, generally expanding it as the height Increases.
Mount the base to the mounting surface using the mounting screws supplied. The
word “DOOR” on the base must be right side up (and arrows pointing down toward
the door) for correct mounting. Re-insert the detection module into the base
(turning counter-clockwise, opposite of removal shown above). Aim the detector
for the coverage desired. Tighten detector module lock screw to prevent
movement of the detector module and disruption of coverage pattern due to
vibration, etc.
To mask the PIR detection pattern, insert masking wedges using small holes at the top and bottom of the PIR lens on the outside surface of the detector. Masking can reduce unintended activation by persons not intending to egress.
After verifying the detection coverage pattern by walk test, make sure all wiring and DIP switch settings are correct and that the detection module aim is locked. Replace the cover and press firmly to snap in place.
Detection coverage pattern
The ideal installation of MD-31DOW provides responsiveness to the motion of
persons attempting to exit while minimizing unintended triggering of the
detector. Persons moving at a normal pace toward the door(s) to exit should be
able to push the door open without waiting for the door to. Persons in areas
not close to the door and not moving toward the door to exit should generally
not cause the door to unlock by triggering the detector. Achieving the proper
balance of ensuring responsiveness while minimizing unintended triggering is
mostly a function of the following factors affecting the coverage pattern:
- Choice of a wall (including door frame) or ceiling mount
- Mounting height
- Aiming of the detector (vertical only)
- Masking of the PIR lens (see “Installation” on the previous page)
In general, the further from the door the detector is located, the larger the
detection pattern becomes. The higher the detector is aimed, the further the
pattern extends (when wall mounted) through the detection range is limited to
about 20 feet (about 6 meters) maximum. Aiming the detector lower to bring the
coverage pattern closer to the door can help eliminate triggering from persons
moving in the vicinity of the door without intending to exit. When selecting
Non-resettable latch time (DIP switch 2 OFF), adjust latch time (DIP switches
4,5, and 6) to allow persons intending to exit to reach the door in time after
triggering the detector.
The Fresnel lens of the PIR detector is segmented to provide six (6) dual
detection zones. The body heat (IR energy) of a person moving through a zone
triggers the detector. When wall mounted at a height of 7’ with the detector
aimed downward by 14°, the MD-31DOW produces approximately the following
coverage pattern on the floor as seen from above:
When wall mounted at a height of 15’ with the detector aimed upward by 14°,
the MD-31DOW produces approximately the following expanded coverage pattern on
the floor as seen from above:
Aiming the detector lower brings coverage closer to the door, possibly
reducing unintended triggering of the detector. When wall mounted at a height
of 7’ with the detector aimed downward by 14°, the MD-31DOW produces
approximately the following coverage pattern on the floor as seen from above
:
When wall mounted at a height of 15’ with the detector aimed downward by 14°,
the MD-31DOW produces approximately the following expanded coverage pattern on
the floor as seen from above:
Viewed from the side, the coverage range is approximate as follows:
To provide a more responsive egress for double doors, mount one MD-31DOW above the center of each door and wire the outputs so that detection of motion by either detector will unlock the doors. In most cases, masking the inside zones on both detectors will not affect responsiveness yet may reduce the possibility of triggering from the insertion of an object between the two doors.
The gap between double doors without a center post may allow intruders to trigger the motion detector by inserting a hot or cold object into the detection pattern. An alternative mounting option should be chosen to avoid this possibility, such as ceiling mounting away from the door.
Installation testing
All wiring connections should be made and verified before any power is
connected to the detector. All power, including standby battery if used,
should be disconnected.
Do not replace detector cover before the following have been completed:
- All wiring connections have been made and verified
- Detector has been properly mounted
- A walk test has been conducted to confirm coverage and proper functioning of the system
Apply power to the unit after determining all wiring connections have been properly made and that no hazards exist. The detector’s green LED will initially flash on and off unless it has been disabled (DIP switch 3 set to OFF position). The LED should be enabled (DIP switch 3 set to ON position) to conduct a proper walk test and can be disabled afterward if required prior to replacing detector cover. Allow the detector to stabilize for five (5) minutes. Conduct a walk test by approaching the door from all angles that persons can normally be expected to approach from and verify responsiveness. Adjust the detector aim up or down as necessary to optimize the detection pattern. Also verify that traffic not intending to exit does not typically trigger the detector. If necessary, adjust the detector aim. Mask the PIR lens if necessary. Be sure to tighten the lock screw for the detector aim after detection coverage has been finalized. Ensure that latch duration allows enough time to reach the door after detection and adjust if necessary. Verify Fail-Safe or Fail-Secure operation by temporarily disconnecting power to the unit and determining that door is unlocked (Fail-Safe) or locked (Fail- Secure). Reset DIP switch 2 if necessary and repeat test. Setting selected must comply with all applicable regulations and be verified by local AHJ (Authority Having Jurisdiction). After confirming the detector is operating as required (including leaving LED enabled or disabling it following final walk test), replace the cover and perform one final walk test to ensure proper operation. he detector should be tested at least once a year to ensure proper operation of all functions.
Important Note:
MD-31DOW is designed for installation by properly trained, experienced and
qualified low-voltage technicians. It should be installed in compliance with
all applicable local, regional and national electrical and safety codes.
Performance Level
MD-31DOW meets the following performance levels for Access Control (UL294 6th Edition):
Feature: Level
Destructive Attack: I
Line Security: I
Endurance: IV
Standby Power: I
Current Ratings
The following are the maximum current ratings for each input voltage:
Input Voltage
12VDC
12VAC
24VDC
24VAC
Maximum Current
16mA
18mA
20mA
22mA
Install in accordance with National Electric Code (NEC 70)
and the applicable National Fire Protection Association (NFPA) Installation
Standards, local codes, and the local Authority Having Jurisdiction (AHJ). All
Circuits Class 2
ACCESS CONTROL
- UL 294 LISTED
- ACCESS CONTROL SYSTEM UNITS
- Edition 6
- Any suggestions or comments on this instruction or product are welcome.
- Please contact us through our website or email [email protected]