Overview
D+H LD Series louvre drives are electric actuators developed for compatible operable glass and aluminium louvre systems.
The drives provide controlled linear movement into the louvre operating mechanism so multiple blades open and close together. On compatible systems, the primary linkage and moving components are concealed within the louvre framing, maintaining a clean architectural appearance without an exposed operating bar across the blades.
The generic D+H technical family is identified as LDx. Installed and supplied drives normally use a completed model reference such as LDS, LDF, LDH, LDJ or LDE, followed by the applicable force, stroke or control configuration.
EBSA can assist with identifying installed drives, selecting current replacements, confirming stroke and control technology, programming compatible models, coordinating controllers and field wiring, and commissioning or maintaining existing louvre systems.
LD Series at a glance
| Product type | Electric louvre window drive |
|---|---|
| Manufacturer | D+H Mechatronic |
| Generic product family | LDx Series |
| Installed model references | May include LDS, LDF, LDH, LDJ, LDE and other application-specific LD references |
| Available drive platforms | LDx 100 Series, LDx-1204, LDx-1400 and LDx-1800 configurations |
| Power options | 24 V DC and selected 230 V AC configurations depending on model |
| Control technologies | PLP and ACB, with synchronised arrangements available on compatible systems |
| Typical applications | Natural ventilation, smoke control, façade automation, replacement and maintenance of compatible operable louvre systems |
| Operating arrangement | Direct connection into a compatible concealed louvre mechanism |
| System requirements | Compatible louvre mechanism, controller, field cabling, programming and project-specific commissioning |
Understanding LDx and installed model references
D+H uses LDx as the generic technical designation for adaptable louvre drives. In an installed or supplied product code, the letter following LD identifies the mechanical or application-specific configuration.
Building owners and maintenance teams may only know the model reference printed on the actuator label. Exact installed references are therefore important when identifying replacement products and technical documents.
Common searchable references include:
- LDS 100/060
- LDS 100/070
- LDS 100/080
- LDF 100/030
- LDF 100/036
- LDF 100/060
- LDF 100/070
- LDH 800/070
- LDE 100/036
- LDJ-1204-1-ACB
- LDx-1204-1-ACB
- LDx-1400 configurations
- LDx-1800 configurations
The model reference should be checked together with the installed voltage, stroke, control technology, operating direction, controller and mechanical arrangement before a replacement drive is ordered.
LDx 100 Series
The LDx 100 Series covers compact application-specific louvre-drive configurations. These drives commonly appear in installed systems under completed references such as LDS, LDF, LDH or LDE.
The actuator is selected to suit the particular louvre operating mechanism, required stroke and drive orientation. Manufacturer- or application-specific installation instructions should be used when confirming the mounting and connection arrangement.
LDx-1204-1-ACB
The LDx-1204-1-ACB is a higher-force 24 V DC louvre-drive platform with D+H ACB communication capability.
Application-specific versions, including references such as LDJ-1204-1-ACB, use the corresponding D+H technical platform with mechanical details configured for the relevant louvre system.
ACB functionality can support digital configuration, addressing, status communication and synchronisation when the drive is connected to compatible D+H ACB control equipment.
LDx-1400 and LDx-1800 drive platforms
LDx-1400 and LDx-1800 configurations provide increased operating force for more demanding louvre mechanisms.
Depending on the model, these platforms are available with:
- 24 V DC PLP operation.
- 24 V DC ACB communication.
- Selected 230 V AC configurations.
- Application-specific stroke and mounting arrangements.
The correct drive must be selected against the operating resistance of the complete louvre mechanism, not simply the number or size of individual blades.
Concealed louvre operation
On compatible LD Series installations, the actuator transfers movement into an operating mechanism concealed within the louvre framing.
This provides several practical and architectural benefits:
- No exposed operating bar across the face of the blades.
- No external moving linkage within the normal occupied area.
- Clean integration with architectural glass or aluminium louvre systems.
- Controlled movement of multiple blades through the internal mechanism.
- Improved protection of the primary linkage from accidental contact.
The internal mechanism, pivots, blade carriers and seals must move freely so the actuator is not subjected to abnormal resistance.
Typical applications
- Automated glass louvre windows.
- Automated aluminium louvre systems.
- Natural ventilation and mixed-mode ventilation.
- Smoke control and smoke relief openings.
- High-level louvres operated from local controls.
- Weather-responsive façade ventilation.
- BMS-controlled louvre openings.
- Replacement of failed or obsolete D+H louvre drives.
- Existing systems requiring programming or recommissioning.
Natural ventilation and smoke control
LD Series louvre drives can form part of natural ventilation, general façade automation and smoke control systems when coordinated with compatible control equipment.
Natural ventilation functions may include:
- Local wall-switch control.
- Room-temperature response.
- Rain and weather control.
- Timers and programmed ventilation sequences.
- BMS or third-party interface commands.
- Group or zone-based operation.
For smoke control applications, the louvre assembly, actuator, control panel, fire alarm interface, power supply, field cabling and commissioning process must be coordinated as one complete system.
PLP control technology
Selected LD Series drives use D+H PLP technology for conventional 24 V DC reverse-polarity operation and configuration of supported drive parameters.
Programming requirements depend on the exact drive model and application. Replacement drives should be checked against the existing stroke, direction, controller and mechanical limits before operation.
ACB communication
ACB-capable LD drives support digital configuration and communication when connected to compatible D+H ACB control equipment.
Depending on the system architecture, ACB may support:
- Drive addressing.
- Parameter configuration.
- Position and status communication.
- Fault identification.
- Synchronised multi-drive operation.
An ACB-capable drive does not provide the full communication functions when connected only to a conventional reverse-polarity controller.
Synchronised louvre-drive arrangements
Larger louvre assemblies may require more than one drive point. Compatible D+H drives can be configured to operate together where the louvre mechanism and control arrangement require synchronisation.
The complete synchronised set should be reviewed before an individual actuator is replaced. Product codes, drive technology, programming and the condition of the remaining drives should be confirmed so the system continues to operate as one coordinated arrangement.
Replacement drive identification
The following information assists EBSA in identifying an existing LD Series drive and determining the current replacement pathway:
- Clear photograph of the complete actuator.
- Photograph of the D+H product label.
- Exact installed model reference.
- Drive voltage and control technology.
- Number of drives operating the louvre.
- Existing controller or control-panel model.
- Photographs of the actuator mounting and blade connections.
- Required opening and closing movement.
- Description of the existing fault.
- Access available for replacement and commissioning.
Mechanism inspection before replacement
A failed actuator may be the result of age, electrical failure or mechanical resistance within the louvre assembly.
Before fitting a replacement drive, the installation should be checked for:
- Binding within the concealed mechanism.
- Damaged pivots or blade carriers.
- Misalignment of the louvre blades.
- Excessive seal resistance.
- Obstructions or debris.
- Incorrect actuator positioning.
- Damaged wiring or controller faults.
Replacing a failed drive without correcting excessive mechanism resistance can result in repeat actuator faults.
Drive and controller coordination
The actuator provides the mechanical opening and closing movement. The controller determines how and when the louvre operates.
The drive and controller should be coordinated for:
- 24 V DC or 230 V AC operation.
- Drive current and power-supply capacity.
- Number of drives per louvre assembly.
- Number of louvres per control group.
- PLP or ACB operation.
- Synchronisation requirements.
- Field cable length and voltage drop.
- Natural ventilation or smoke control operation.
- Weather sensors and local controls.
- BMS and fire alarm interfaces.
Product data downloads
Use the generic D+H product data to review the applicable technical platform. The exact installed or required model reference should still be confirmed before selection.
| Drive platform | Typical reference | Product data |
|---|---|---|
| LDx 100 Series | Generic technical data for LDx 100 application-specific drives |
Download LDx 100 Series data |
| LDx-1204-1-ACB | Higher-force 24 V DC ACB-capable louvre drive |
Download LDx-1204 data |
| LDx-1400-1-PLP | 24 V DC PLP configuration |
Download LDx-1400 PLP data |
| LDx-1400-1-ACB | 24 V DC ACB configuration |
Download LDx-1400 ACB data |
| LDx-1800-1-PLP | 24 V DC PLP configuration |
Download LDx-1800 PLP data |
| LDx-1800-1-ACB | 24 V DC ACB configuration |
Download LDx-1800 ACB data |
| LDx-1400-5 | Selected 230 V AC configuration |
Download LDx-1400-5 data |
| LDx-1400-5-ACB | Selected ACB-capable configuration |
Download LDx-1400-5-ACB data |
| LDx-1800-5 | Selected 230 V AC configuration |
Download LDx-1800-5 data |
| LDx-1800-5-ACB | Selected ACB-capable configuration |
Download LDx-1800-5-ACB data |
Model-specific installation instructions
Use the instructions matching the exact installed drive reference. Similar product codes may use different strokes, connection details or mounting arrangements.
| Installed model reference | Applies to | Instructions |
|---|---|---|
| LDS 100/060, 100/070 and 100/080 | Combined instructions for applicable LDS 100 variants |
Download LDS instructions |
| LDF 100/030 L/R | Left- and right-hand LDF 100/030 configurations |
Download LDF 100/030 instructions |
| LDF 100/036, 100/060 and 100/070 | Applicable LDF 100 configurations covered by the retained combined instructions |
Download LDF instructions |
| LDH 800/070 | LDH 800/070 louvre-drive arrangement |
Download LDH instructions |
| LDE 100/036 | LDE 100/036 louvre-drive arrangement |
Download LDE instructions |
| LDJ-1204-1-ACB | Application-specific LDJ-1204 ACB arrangement |
Download LDJ instructions |
Frequently asked questions
What does LDx mean?
LDx is D+H’s generic technical designation for adaptable louvre drives.
On the installed product, the x is normally replaced by a letter identifying the mechanical or application-specific configuration.
How can I identify my existing D+H louvre drive?
Start with a clear photograph of the actuator label and complete drive installation.
The installed model may use a reference such as LDS 100/070, LDF 100/060, LDH 800/070, LDE 100/036 or LDJ-1204-1-ACB. EBSA can use the reference and installation photographs to review the likely replacement pathway.
Are the louvre linkages exposed?
On compatible LD Series installations, the primary operating linkage and moving mechanism are concealed within the louvre framing.
This provides a clean architectural appearance without an exposed operating bar across the face of the blades.
Can LD Series drives be used for natural ventilation?
Yes. Compatible LD drives can operate as part of natural ventilation systems using wall switches, sensors, weather controls, timers, BMS commands or programmed ventilation logic.
Can LD Series drives be used for smoke control?
Yes. Suitable LD drives can form part of a coordinated smoke control system.
The louvre assembly, actuator, control panel, fire interface, field cabling and commissioning requirements must be reviewed as one complete system.
What is the difference between PLP and ACB?
PLP provides conventional 24 V DC reverse-polarity operation with supported D+H programming functions.
ACB adds digital configuration and communication when connected to compatible D+H ACB control equipment.
Can one drive be replaced in a synchronised louvre system?
Potentially, but the full drive set and system configuration should be reviewed first.
The replacement must be compatible with the remaining drives, controller, programming and concealed louvre mechanism.
Why should the louvre mechanism be checked before replacing the drive?
Binding, damaged pivots, misalignment, excessive seal resistance or faults within the concealed mechanism can overload the actuator.
Correcting the mechanical cause helps prevent repeat drive failure.
Can EBSA program and commission LD Series drives?
Yes. EBSA can identify, configure, program and commission compatible PLP and ACB louvre-drive arrangements using the applicable D+H tools and system information.
Can EBSA maintain existing operable louvre installations?
Yes. EBSA can inspect, test, program, commission and maintain compatible D+H louvre-drive and control systems.
EBSA also provides broader service support for many operable louvre systems, subject to the installed product, condition, access and availability of suitable replacement components.
Compare related louvre-drive products
- LAH 65 Louvre Drives: current specialist LAH products and replacement support for selected legacy LAH 61, LAH 62, LAH 63 and LAH 64 installations.
- Louvre Drives: overview of the D+H LD Series and LAH louvre-drive families.
- Window Control Panels: control panels for natural ventilation, smoke control and project-specific automated opening systems.
LD Series identification and selection support
LD Series selection depends on the installed model reference, louvre mechanism, required force and stroke, voltage, control technology, synchronisation, controller and field wiring.
EBSA can assist with identifying an existing actuator, selecting the applicable current drive, confirming the control arrangement, programming the replacement and commissioning the completed system.
