Overview
D+H window locking drives provide powered operation of compatible multipoint window locking systems.
The locking drive works in sequence with the primary D+H window actuator. Before the window opens, the locking drive releases the multipoint locking hardware. The connected chain drive then opens the sash. During closing, the locking drive waits until the chain drive confirms that the sash is fully closed before re-engaging the multipoint lock.
The range includes:
- FRA 11-BSY+ rotary window locking drive.
- VLD 51/038-BSY+ linear window locking drive.
- VLD-0600-038-1-BSY+ linear window locking drive.
The FRA and VLD models use different mechanical arrangements and are not interchangeable without reviewing the window profiles, multipoint locking hardware, primary opening drive and control sequence.
Locking-drive range at a glance
| Model | Locking method | Typical installation |
|---|---|---|
| FRA 11-BSY+ | Rotary operation of a compatible internal multipoint-lock gearbox | Mounted in place of the conventional window handle |
| VLD 51/038-BSY+ | Linear operation of compatible multipoint sliding-lock hardware | Integrated into the window profile or mounted on the frame |
| VLD-0600-038-1-BSY+ | Linear operation of compatible multipoint sliding-lock hardware | Integrated into the window profile or mounted on the frame |
Multipoint window locking
FRA and VLD locking drives are primarily used to automate compatible multipoint window locking systems.
A multipoint system uses a gearbox, connecting rods or sliding locking bar to operate several locking points around the sash perimeter. Depending on the window hardware, these may include locking cams, rollers, bolts, shoot bolts or other locking elements.
Powered multipoint locking can assist with:
- Automatic release of all locking points before the window opens.
- Consistent engagement of several locking points after closing.
- Compression of the sash against compatible perimeter seals.
- Secure closure of larger or heavier automated windows.
- Operation of concealed window hardware.
- Coordinated locking within natural ventilation and smoke control systems.
The complete window must be designed and adjusted so the profiles, hinges, seals, gearbox, locking points, opening actuator and locking drive operate together correctly.
BSY+ synchronisation with D+H chain drives
The FRA 11-BSY+ and VLD BSY+ locking drives communicate with compatible D+H chain drives through the D+H BSY+ system.
This communication provides the required operating sequence:
- An open command is issued to the window system.
- The locking drive releases the multipoint locking system.
- The locking drive confirms that the window is unlocked.
- The D+H chain drive is then permitted to open the sash.
- When a close command is issued, the chain drive closes the sash first.
- The locking drive waits for confirmation from the chain drive that the window is fully closed.
- Only after receiving the fully closed confirmation does the locking drive engage the multipoint locking system.
This prevents the chain drive from attempting to open a locked window and prevents the multipoint locking hardware from engaging before the sash has reached its fully closed position.
Depending on the connected actuator, the required closed-position or sequence signal may be provided through BSY+ or an applicable D+H position-feedback option.
FRA 11-BSY+ rotary locking drive
The FRA 11-BSY+ is a rotary locking drive designed to operate compatible multipoint window hardware through an internal gearbox.
It is installed in place of the conventional window handle and connects to the gearbox through a 7 mm square shaft.
During an open command, the FRA 11-BSY+ rotates the gearbox to release the multipoint locking points before enabling the connected D+H opening drive. During closing, it waits for confirmation that the sash is fully closed before rotating the gearbox back to the locked position.
| Model | FRA 11-BSY+ |
|---|---|
| Supply voltage | 24 V DC ±15% |
| Nominal current | 1 A |
| Torque | 10 Nm |
| Square-shaft breaking load | 30 Nm |
| Turning angle | 90° or 180° |
| Running time | Approximately 8 seconds at 180° |
| Duty cycle | 30% with a 10-minute cycle time |
| Ingress protection | IP40 |
| Dimensions | 43 × 200 × 43 mm |
| Programming | Individually programmable using D+H SCS software |
| Maximum locking drives | Up to four FRA 11-BSY+ drives on one compatible window |
The FRA 11-BSY+ includes a position indicator, LED status indication and a manual emergency-release arrangement.
FRA 11-BSY+ application requirements
The FRA 11-BSY+ requires a compatible multipoint-lock gearbox and a 43 mm mounting distance.
Before selection, the following should be confirmed:
- The internal multipoint-lock gearbox is compatible with the FRA drive.
- The locking hardware operates freely through its complete travel.
- The sash closes evenly against the frame.
- The window is correctly aligned.
- The 7 mm square shaft suits the installed gearbox.
- The required 90° or 180° rotation is correctly configured.
- The connected D+H opening drive provides the required closed-position confirmation.
- The unlock-open-close-lock sequence is correctly programmed and tested.
Excessive resistance within the gearbox, locking rods, locking points or sash can cause overload faults and unreliable operation.
VLD linear locking drives
The VLD models are compact linear drives for operating compatible multipoint sliding-lock hardware.
They may be integrated into suitable window profiles or mounted on the frame using the applicable fitting arrangement.
During opening, the VLD moves the locking bar to release the multipoint locking points before the connected BSY+ chain drive begins to open. During closing, the VLD waits until the chain drive confirms that the sash is fully closed before moving the locking bar back into the locked position.
Up to six compatible VLD BSY+ locking drives may be synchronised on one window, subject to the complete window and control-system design.
VLD 51/038-BSY+
| Model | VLD 51/038-BSY+ |
|---|---|
| Supply voltage | 24 V DC ±20% |
| Nominal current | Up to 1 A |
| Locking stroke | 19 mm or 38 mm, depending on configuration |
| Locking force | Up to 500 N |
| Unlocking force | Up to 600 N |
| Breakaway force | Up to 1000 N in the unlocking direction |
| Running speed | Approximately 3.3 mm/second |
| Duty cycle | 30% with a 10-minute cycle time |
| Housing | V2A stainless steel |
| Dimensions | 493 × 25 × 25 mm |
| Programming | Individually programmable using D+H SCS software |
The VLD 51/038-BSY+ includes a service-position input that can assist with access for window cleaning and maintenance.
VLD-0600-038-1-BSY+
| Model | VLD-0600-038-1-BSY+ |
|---|---|
| Supply voltage | 24 V DC ±20% |
| Nominal current | Up to 1 A |
| Maximum locking stroke | 38 mm |
| Locking force | Up to 600 N |
| Unlocking force | Up to 600 N |
| Breakaway force | Up to 1000 N in the unlocking direction |
| Running speed | Approximately 3.3 mm/second |
| Service life | More than 20,000 double strokes |
| Duty cycle | 30% with a 10-minute cycle time |
| Housing | V2A stainless steel |
| Dimensions | 493 × 25 × 25 mm |
| Programming | Individually programmable using D+H SCS software |
The VLD-0600-038-1-BSY+ provides up to 600 N in both the locking and unlocking directions and has a stated service life of more than 20,000 double strokes.
VLD 51 and VLD-0600 selection
The VLD 51/038-BSY+ and VLD-0600-038-1-BSY+ share the same compact housing dimensions but differ in locking force, service life and product configuration.
Selection should consider:
- Required locking and unlocking force.
- Required 19 mm or 38 mm movement.
- Multipoint locking-bar arrangement.
- Profile dimensions and available installation space.
- Integrated or surface-mounted installation.
- PI-VLD or RE-VLD fitting arrangement.
- Required service-position access.
- Number of locking drives on the window.
- Compatibility with the connected D+H BSY+ chain drives.
BSY+ programming and system setup
The FRA and VLD locking drives incorporate D+H BSY+ electronics for coordinated operation with compatible D+H chain drives and other opening actuators.
Programming and commissioning may include:
- Locking direction.
- Drive addressing.
- BSY+ group configuration.
- FRA rotation angle.
- VLD locking stroke.
- Opening-drive compatibility.
- Closed-position confirmation.
- Unlock-open-close-lock sequencing.
- Service-position functions.
- Fault monitoring.
EBSA provides D+H product selection, SCS programming, BSY+ configuration and commissioning support for compatible locking-drive systems.
Integrated and surface-mounted VLD installation
VLD drives may be integrated into compatible window profiles or mounted on the outer frame.
The applicable fitting arrangement must be selected to suit the window construction:
- PI-VLD tappet-driver arrangement.
- RE-VLD frame-fitting arrangement.
Bracket and fitting sets are selected separately.
VLD drives are supplied without a connection cable. The correct pre-assembled cable and connector must be selected for the applicable 6-pin or 12-pin drive version.
VLD replacement compatibility
Different VLD 51 product revisions should not be mixed within the same parallel drive arrangement.
Where paired drives are installed, the product numbers and versions should be reviewed before replacing one unit. In some installations, the complete drive pair may require replacement.
EBSA can review the installed references, connector arrangement, window hardware, chain drives and BSY+ programming before confirming the replacement approach.
Manual emergency unlocking
The FRA 11-BSY+ can be released from its base plate and operated similarly to a conventional window handle during a power failure.
The VLD models can also be manually unlocked where the required access point has been incorporated into the window profile.
Emergency-release access should be considered during the window and profile design.
Applications
D+H locking drives may be used in compatible systems for:
- Automated windows fitted with multipoint locking systems.
- Tilt-and-turn windows.
- Side-hung and bottom-hung windows.
- Large windows with several perimeter locking points.
- Windows with concealed gearboxes or sliding locking bars.
- Natural ventilation systems.
- Smoke control and smoke ventilation openings.
- Windows requiring automated locking after closing.
- Windows requiring controlled sash compression against compatible seals.
Natural ventilation and smoke control
The FRA and VLD ranges may form part of compatible natural ventilation and smoke control systems.
The complete opening should be reviewed, including:
- The window construction and multipoint hardware.
- The primary D+H chain drive or opening actuator.
- The BSY+ locking sequence.
- The D+H control panel.
- The fire alarm or building-management interface.
- The required opening position.
- The field wiring.
- The commissioning and testing requirements.
Suitability depends on the complete window, actuator, locking, control and project configuration rather than the locking drive in isolation.
Information required for product selection
Provide the following information when requesting locking-drive support:
- Window type and opening direction.
- Sash dimensions and approximate weight.
- Window profile drawings.
- Multipoint-lock gearbox details.
- Number and location of locking points.
- Required locking movement.
- Primary D+H chain-drive model.
- Control-panel model.
- Natural ventilation or smoke control requirements.
- Photographs and model labels for existing installations.
- Available mounting space.
- Required integrated or surface-mounted arrangement.
Installation and commissioning
Locking-drive installation should be coordinated with the window manufacturer, hardware supplier, electrical contractor and controls provider.
Commissioning should include:
- Mechanical alignment of the sash.
- Free movement of the multipoint locking hardware.
- Confirmation of opening and locking directions.
- Drive addressing and BSY+ group configuration.
- Programming of angle, stroke and force settings where applicable.
- Testing of the complete unlock-open-close-lock sequence.
- Verification that the chain drive cannot open until the lock is released.
- Verification that the lock cannot engage until the chain drive confirms full closure.
- Manual emergency-release testing.
- Fault and status-indication testing.
- Recording of final settings and product references.
Product downloads
| Model | Product data | Instructions |
|---|---|---|
| FRA 11-BSY+ |
Download FRA 11-BSY+ data sheet |
Download FRA 11-BSY+ instructions |
| VLD 51/038-BSY+ |
Download VLD 51/038-BSY+ data sheet |
Download VLD 51/038-BSY+ instructions |
| VLD-0600-038-1-BSY+ |
Download VLD-0600-038-1-BSY+ data sheet |
Download VLD-0600-038-1-BSY+ instructions |
Frequently asked questions
What type of window hardware do FRA and VLD drives operate?
They primarily operate compatible multipoint window locking systems.
The FRA 11-BSY+ operates an internal gearbox through a square shaft. The VLD models provide linear movement to compatible sliding locking bars or frame-mounted multipoint hardware.
Does the locking drive open the window?
No. The locking drive releases and secures the multipoint hardware. A separate compatible D+H chain drive or other opening actuator moves the sash.
How does the locking drive synchronise with the chain drive?
Through D+H BSY+ communication, the locking drive releases the multipoint lock before the chain drive is permitted to open.
During closing, the locking drive waits until the chain drive confirms that the sash is fully closed before engaging the multipoint lock.
What is the difference between FRA and VLD locking drives?
The FRA 11-BSY+ is a rotary drive that replaces the window handle and operates an internal gearbox through a square shaft.
The VLD models are linear drives that operate compatible sliding locking bars and may be integrated into the profile or mounted on the frame.
What is the difference between VLD 51 and VLD-0600?
The VLD-0600 provides up to 600 N locking force and has a stated service life of more than 20,000 double strokes.
The VLD 51 provides up to 500 N locking force and can be configured for 19 mm or 38 mm travel.
Can more than one locking drive be installed on a window?
Yes. Up to four FRA 11-BSY+ drives or up to six compatible VLD BSY+ drives may be used on one window, subject to the multipoint hardware, addressing, opening drives and complete system design.
Can EBSA programme the locking drives?
Yes. EBSA can configure compatible FRA and VLD drives using D+H SCS software and coordinate their BSY+ operation with compatible D+H chain drives.
Can a locking drive improve weather sealing?
A locking drive can operate the window’s multipoint hardware and assist with consistent sash compression where the profiles, seals and locking system are designed for that function.
Can the drives be manually released during a power failure?
Yes. The FRA 11-BSY+ includes a manual-release arrangement. The VLD models can also be manually released where the required access point has been incorporated into the window profile.
Can the drives be used for smoke control?
They may form part of compatible smoke ventilation or smoke control openings. The complete window, chain drive, locking hardware, control panel, interfaces and project requirements must be reviewed.
Can EBSA replace an existing locking drive?
Yes. EBSA can review the installed drive, multipoint hardware, connector arrangement, D+H chain drive and BSY+ programming before confirming the replacement and commissioning requirements.
Related drive pages
- Specialty Drives: locking, door, heavy-duty and skylight drives.
- Chain Drives: primary opening drives for automated windows.
- Rack and Pinion Drives: robust linear actuators for larger and heavier openings.
- Window Automation: complete natural ventilation and façade automation systems.
Discuss a multipoint window locking application
Provide EBSA with the window drawings, profile details, multipoint hardware arrangement, D+H chain-drive model and control requirements. We can review the complete locking and opening sequence and recommend the appropriate FRA or VLD solution.
