dormakaba BML-8371 Electro Magnetic Locks Instruction Manual

dormakaba BML-8371 Electro Magnetic Locks

Spanish and French translations are available at https://dhwsupport.dormakaba.com/hc/en-us.

PLEASE DELIVER ALL INSTALLATION INSTRUCTIONS TO THE END USER UPON COMPLETION OF THE INSTALLATION.

Pre-Installation Instructions

1. This product must be installed according to all applicable building and life safety codes.

2. Due to the variety of mounting configurations available with this product, a survey and assessment of the physical area in which the product will be installed must be performed.

3. The door frame must be inspected and deemed structurally sound prior to the installation of the electromagnetic lock. The structural integrity of the mounting surfaces must be strong enough to meet or exceed the holding force of the product.

4. The product must be protected from potential damage due to intruders or tampering.

5. The product should be installed in a location that will not hinder or create a potential safety hazard to authorized personnel accessing the protected area.

6. Because electromagnetic locks are used in a variety of applications and different door frame configurations, an experienced installer with knowledge of this product must make a determination of the optimal mounting method for this specific application.

7. The components, hardware, installation instructions, and mounting template included with this product are intended for use on out-swinging doors.

8. Do not install this product on the exterior of buildings.

9. Do not use it as a doorstop. This will void the warranty.

10. Separate accessories not included with this product must be used in the following applications:

    • Inswinging doors
    • Narrow head jamb situations or center-hung doors
    • Wherever there is insufficient space on the door frame header to mount the lock
    • Glass or Herculite doors that do not have a door frame
    • Hollow metal or wood frames where the door stop is not thick enough to allow the product to be installed
    • Wherever an obstruction in the door prevents installation of the armature plate at a proper height
    • Doors that do not permit the armature plate to be mounted low enough to meet the magnet surface
      Refer to the Product Accessories Guide section of the Installation Instructions for further information. Accessories may impact holding force.

11. Installation of this product should be done by an experienced installer with knowledge of this product.

NOTE:
It is highly recommended that thread locking compound be applied to all screws during installation to reduce the chance of screws loosening over an extended time.

Installation Instructions

1. Mount the electromagnetic lock to the door frame as outlined on the installation template included with the product.
   NOTE: During the installation of the armature plate to the door it is essential that the armature plate remains movable. The armature plate must be allowed to pivot on the center-mounting bolt to allow proper alignment with the magnet surface. If the plate is not aligned with the magnet surface, the lock may lose holding force or not lock at all.
   The head of the armature mounting bolt ships with a rubber washer affixed to it. This washer should project slightly beyond the surface of the armature plate. This is to allow the washer to expand when power is removed and break the air vacuum between the plate and the magnet surface. If this washer is removed or trimmed the lock will appear to have some holding force even when power is removed.
   For added safety, a thread locking compound has been provided for the armature plate bolt and the four captive electromagnetic lock mounting screws.
   WARNING:
   Improper installation, maintenance, inspection, or usage of the product or any related accessories or parts may cause the electromagnetic lock, armature plate, and associated hardware to disengage and fall, causing serious bodily injury and property damage. Best Access Solutions Inc. will not be liable to the installer, purchaser, end user or anyone else for damage or injury to a person or property due to improper installation, care, storage, handling, maintenance, inspection, abuse, misuse, or act of God or nature involving this product or any related accessories or parts.

2. Route the power supply connecting wire through the door frame and into the wire access hole in the top of the magnet housing. The connecting wire should be of sufficient gauge for the lock being installed and the distance being run. See table for current draw specifications and wiring gauge chart.

Wiring

For Unmonitored or DSS Sensor Models

Power Input Requirements

MODEL            12VDC       24VDC

BML-8371| 0.52A| 0.26A
BML-8372| 1.04A| 0.52A

SCS (Security Condition Sensor) with LED
This feature can detect the quality of the locking bond between the surface of the magnet and the armature plate. The sensitivity of this feature is such that a foreign object with a thickness of .007” (.18mm) is sufficient to allow the sensor to detect a problem.

Due to the sensitivity of this feature and the necessity to maintain a reliable locking bond, these surfaces must be kept free of contaminating materials. Both the lock surface and the armature plate must be cleaned periodically with a non-abrasive cleanser. Alignment of the armature plate and magnet is required to ensure the proper function of the sensor.

DSS (Door Status Sensor)
The DSS option monitors the position of the door upon which the lock is installed. An SPST reed switch eliminates the need for extra sensors to be installed on the door for notification of security or access control systems. The DSS option comes with a magnet pre-installed into the lock armature plate for signaling the reed switch in the housing when the door is closed. Care should be taken during the final testing of the lock to ensure that the DSS option is operating in the desired manner.

UL 294 Performance Ratings:

Access Control Line Security: Level I
Destructive Attack: Level I
Endurance: Level IV
Standby Power: Level I

Wiring: For SCS or SCS/DSS Combination Models

Power Connections

NOTE:
All BEST electromagnetic locks must be powered with filtered and regulated DC power supplies. RCI offers a full line of power supplies that are suitable for use with the BML-8371 and BML-8372 Surface locks.

To Ensure Instant Release All switching devices must be wired in between the DC power source and the positive terminal of the lock as shown.

Switching the negative power supply line will not allow the lock to release immediately. BEST electromagnetic locks contain MOV’s for surge suppression and do not require any additional suppression to be added during installation. The installation of diodes across the lock input terminals will cause a delay in release.

Anti-Tamper Feature
Two screws prevent the insertion of an Allen wrench into the captive mounting bolt opening on the bottom of the lock. Fig. 2 shows their location. One screw also secures the wiring cavity cover. The mounting plate cannot be separated from the lock without removing these two screws. There is an additional anti- tamper screw under the wiring cavity cover.

Specifications

• Mechanical: including 3/16″ [5mm] mounting bracket:

• BML-8371 Lock Dimensions:
  1″D x 1-7/8″W x 9-3/8″L (25 x 48 x 238mm)

• BML-8372 Lock Dimensions:
  1″D x 1-7/8″W x 18-3/4″L (25x 48 x 476mm)

• Armature Plate Dimensions:
  1/2″D x 1-1/2″W x 7-1/4″L (13 x 38 x 185mm)

Electrical:

• Voltage: 12VDC or 24VDC
• Current: Max 0.52A at 12VDC (each lock on BML-8372 model) Max 0.26A at 24VDC (each lock on BML-8372 model)
• SCS Output Relay: SPDT relay. Contacts rated at 1.0A@24VDC
• DSS Reed Switch: Magnetically actuated SPST switch. Contacts rated for 0.20A @12VDC and 0.12A @ 24VDC

Effective for either resistive or inductive loads (power factor ≥ 0.6 with inductive loads)

Environmental:
Not for use in outdoor environments.

• Circuit board operating temperature: 32˚ to 120˚F (0˚ to 49˚C)

NOTE: Specifications are subject to change without notice.

Inspection and Maintenance

This product and all related accessories or parts must be inspected and maintained on a quarterly basis. Contacting surfaces of the electromagnetic lock and armature plate must be kept free of contaminating materials. Surfaces must be cleaned periodically with a non-abrasive cleaner.

All mounting fasteners must be inspected on a quarterly basis. When properly installed, the ends of the armature plate allow a slight movement but the plate will feel secure when grasped at the bolt. There should be no movement to the mounting bracket or housing of the electromagnetic lock. For added safety, a thread locking compound has been provided for the armature plate bolt and the four captive electromagnetic lock mounting screws.

WARNING:
Improper installation, maintenance, inspection or usage of the product or any related accessories or parts may cause the electromagnetic lock, armature plate, and associated hardware to disengage and fall, causing serious bodily injury and property damage.

Product Accessories Guide

Accessories may impact holding force. (Separate installation instructions provided with accessories.).

Listings

These products have been successfully tested and evaluated by UL in two separate categories for use in both the United States and Canada.

• Auxiliary Lock. The GWXT fire listing qualifies these for use with UL Classified fire doors maximum 4’ in width and 8’ in height. The BML-8371 and BML-8320 are rated up to and including 1 hr.
• Special Locking Arrangement Component. Additionally, these products are qualified components for the purpose of locking outward-swinging exit doors against unauthorized egress. They are designed to release automatically in case of a power failure or upon activation of an automatic fire alarm system wired to the power supply fire panel relay.

The Following Conditions of Acceptability Apply:

1. This product is intended for use with Special Locking Arrangements which are installed in accordance with the manufacturer’s installation and operation instructions, the Life Safety Code, NFPA 101 of the National Fire Protection Association, and the local authority having jurisdiction.
2. The power for this unit is to be provided by a Listed (ALVY, FULA, or APHV) Class 2 power supply when designated as a Special Locking Arrangement (FWAX).
3. The suitability of the lead wires is to be evaluated per the requirements for the end-use product.
4. If the product is installed in conjunction with a fire alarm control panel, the wiring from the control unit to this product device shall be for fail-safe operation.

UL testing was conducted on standard models without accessories. These locks are not intended or tested for use as a UL Listed Burglar Alarm System Unit.

PLEASE DELIVER ALL INSTALLATION INSTRUCTIONS TO THE END USER UPON COMPLETION OF THE INSTALLATION

Troubleshooting Guide

Cannot remove the lock mounting bracket from the top of a magnet for installation.| Remove the anti-tamper screw and cavity cover screw. A second anti-tamper screw will be visible after the cavity cover is removed.

Insert supplied Allen wrench into mounting bolt holes in the bottom of the

lock housing and turn. (See Fig. 2 and 3.)

LED goes out when the door is locked| Check input polarity.
Lock is installed but has no holding force at all.| Check the power supply. DC power should be slightly over the voltage specifications outlined on the packaging. eg: for 12VDC operation supply should be set at 12VDC-13VDC.

Check connections at the power supply, connected releasing devices, lock terminals, and lock circuit board to the magnet core.

The lock has enough holding force to lightly hold a screwdriver or set of pliers but the door will not lock.| Check to see that the armature plate is correctly aligned with the electromagnetic lock.

If there is improper alignment, make a 1/4″ turn of the armature plate mounting bolt and check for alignment.

Make sure to follow the armature plate mounting instructions on the template and Page 1 of this install.

A lock is operating and locking but the armature plate is “humming” against the surface of the lock.| This generally indicates that the lock is either operating on AC voltage or there is some AC voltage present in the DC supply. A properly filtered and regulated DC power supply is required to achieve optimal operation from the lock.
A lock is not released immediately upon the removal of power| Ensure that switching devices are interrupting the DC power and not the AC power supply voltage.

Ensure the rubber washer on the armature plate mounting bolt has not been removed or damaged

Check that the switching device interrupts the positive wire and not the negative wire (See Fig. 1)

Remove any Diodes or other suppression devices that may be installed.

WIRE GAUGE SELECTIONS

Total One-Way Length of Wire Run (ft.)| 1/4A| 1/2A| 3/4A| Load

1A

| Current @24V
1-1/4A| 1-1/2A| 2A| 3A
---|---|---|---|---|---|---|---|---
100| 24| 20| 18| 18| 16| 16| 14| 12
150| 22| 18| 16| 16| 14| 14| 12| 10
200| 20| 18| 16| 14| 14| 12| 12| 10
250| 18| 16| 14| 14| 12| 12| 12| 10
300| 18| 16| 14| 12| 12| 12| 10| —
400| 18| 14| 12| 12| 10| 10| —| —
500| 16| 14| 12| 10| 10| —| —| —
750| 14| 12| 10| 10| —| —| —| —
1000| 14| 10| 10| —| —| —| —| —
1500| 12| 10| —| —| —| —| —| —
Total One-Way Length of Wire Run (ft.)| 1/4A| 1/2A| 3/4A| Load 1A| Current @12V
1-1/4A| 1-1/2A| 2A| 3A
---|---|---|---|---|---|---|---|---
100| 20| 18| 16| 14| 14| 12| 12| 10
150| 18| 16| 14| 12| 12| 12| 10| —
200| 16| 14| 12| 12| 10| 10| —| —
250| 16| 14| 12| 10| 10| 10| —| —
300| 16| 12| 12| 10| 10| —| —| —
400| 14| 12| 10| —| —| —| —| —
500| 14| 10| 10| —| —| —| —| —
750| 12| 10| —| —| —| —| —| —
1000| 10| —| —| —| —| —| —| —
1500| 10| —| —| —| —| —| —| —

Wire Gauge Chart courtesy of Electronic Locking Devices by John L. Schum.

BEST is a trademark of dormakaba USA Inc. ©2021 All rights reserved.

Spanish and French translations are available at https://dhwsupport.dormakaba.com/hc/en-us.

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