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Formerly Johnson Systems

LED Dimmer Relay Panel

Presidor™ Intelligent Power Control

Presidor™ Lighting Panels combine LED dimmers and relays in a single enclosure, delivering efficient and cost-effective installations. With DMX input and an optional DIN rail node, these LED dimmer relay panels support a wide range of applications and are offered in two panel sizes. Small dimmer relay panels are available in 8 or 12 channels, while the large Presidor™ lighting panel supports up to 24 channels for larger installations. Every option can include a splitter relay panel board with a local 3-pole 40-amp disconnect breaker for added safety.

More About Intelligent Power Control Ordering Information Technical Documentation

LED Dimmer Relay Panels, Designed for Cost-Effective Lighting Control Solutions

Our panels can be custom-built with factory-installed modules in your preferred order. Options include dual relay, quad relay, or quad dimmer. Our intelligent dimmers use advanced reverse-phase control, are rated at 600W, and support full-range dimming (1–100% DMX) for both LED and incandescent loads. Air-gap relays switch ON/OFF at selectable DMX thresholds from 10% to 90%.

0–10VDC analog outputs can be set as a source or sink for direct drive of analog ballasts. Every circuit includes protection against overload, short circuit, temperature, overvoltage, and inductive load, ensuring safe lighting control. LED indicators and real-time error reporting feed directly to the command control for advanced diagnostics typically reserved for high-end systems.

The Presidor™ Command Controller features a full-color capacitive touch GUI for fast setup and automatic error reporting. With smart operation and an intuitive design, these relay cabinets deliver exceptional lighting performance.

Our LED dimmer relay panels:

  • Combine reverse-phase LED dimmers and air-gap relays in one panel.
  • Have dimmers that employ MOSFET power outputs for unsurpassed dimming efficiency (≥99%).
  • Use 277VAC-rated 50-AMP tungsten “Air-Gap” relays in the relay modules.
  • Support easy panel configuration with a modular design.
  • Provide DMX input with an optional Ethernet node.
  • Use an analog 0-10VDC source or sink capability on relay outputs.
  • Come available in 8, 12, or 24 channels.
  • Include an optional local disconnect breaker.
  • Deliver intelligent load and error sensing and reporting.
  • Integrate full color, capacitive touch GUI Command Control.
  • Achieve ultra-low standby power for “Green” compliance.
  • Supply a 24VDC 600mA isolated output power supply (PWS).
  • Incorporate fire contact input.
  • Maintain ETL certification while being built to the UL 508A standard.
  • Have 19 patents issued for the U.S., Canada, and Europe

Module Types

Type L = 4 x 600 Watt LED
Dimmer Module
Type 4 = 4 x 600 Watt
Relay Module
Type 2 = 2 x 1200 Watt
Relay Module
Type A = Blank
Airflow Module

How to Order

Select Lighting Control Relay Panel Size based on the maximum number of modules/channels possible:

ModelProduct Description/Maximum Output Capacity
PP-82 modules or 8 channels maximum
PP-123 modules or 12 channels maximum
PP-246 modules or 24 channels maximum
  1. Select panel size between choices 8, 12, or 24.
  2. Select voltage input between choices of 120/208 or 120/240.
  3. Select output/module type in order from top to bottom between choices L, 4, 2, or A.
  4. Select the disconnect breaker option (DB) if applicable.
For recommended control, please see Presidor Wall Controls (PWS).

Ordering Information

ModelProduct Description/Maximum Output Capacity
PP-8Small panel, 2 module capacity, Maximum 8 load circuits, Maximum capacity 4,800 Watts.
PP-12Small panel, 3 module capacity, Maximum 12 load circuits, Maximum capacity 7,200 Watts.
PP-24Large panel, 6 module capacity, Maximum 24 load circuits, Maximum capacity 14,400 Watts.
DBOptional 3P40A Disconnect Breaker.
Type LQuad LED Dimmers, 4 x 600W Intelligent Dimmers. Maximum capacity 2,400 Watts.
Type 4Quad Air-Gap Relays, 4 x 600W Intelligent Relays. Maximum capacity 2,400 Watts.
Type 2Dual Air-Gap Relays, 2 x 1,200W Intelligent Relays. Maximum capacity 2,400 Watts.
Type AAirflow/Block-off. Permits future panel capacity expansion.

Presidor™ LED Dimmer & Relay Panels

Presidor™ PP-8 & -12

Base Specifications

Voltage: 100 – 240 VAC operational range at 50 or 60 Hz
Power Consumption: 11 Watts (idle), ie, 400mW /Channel
Cabling: RS485 Cat5/5e/6 cable or retrofit into existing Belden#9773 or equivalent, 300m Max (1000′).
Dimensions: 18.7″ W x 22.1″ H x 4.5″ D (476mm x 561mm x 112mm)
Weight: +-40 lbs ( +-18Kg)

Presidor™ PP-24

Base Specifications

Voltage: 100 – 240 VAC operational range at 50 or 60 Hz
Power Consumption: 11 Watts (idle), ie, 400mW/Channel
Cabling: RS485 Cat5/5e/6 cable or retrofit into existing Belden#9773 or equivalent, 300m Max (1000′).
Dimensions: 18.7″ W x 32.2″ H x 4.5″ D (476mm x 817mm x 112mm)
Weight: +-60 lbs ( +-27Kg)

Product Specifications

  • Available in single and three-phase.
  • LED dimmable and incandescent dim standard.
  • Relay for non-dim circuits.
  • DMX-512 start is addressable in a single channel (offset) or individually (patch).
  • Embedded programming with binary addressing for each module.
  • Intelligent fault/error reporting for short circuits, inductive loads, overloads, and more.
  • Real-time feedback on input voltage and frequency in Hz.
  • Automated feedback per channel on loading capacity in Watts.
  • Intelligent feedback on total load for the rack in Watts.
  • User-adjustable curve/trip set for LED fixtures with different turn-on points.
  • Programmable fire setup.
  • Capacitive touch display for easy setup and configuration.
  • Intuitive navigation for simplified operation.
  • Opto-isolated DMX in and through.
  • Fire alarm auxiliary input.
  • Overheat and overcurrent protection.
  • Analog 0-10VDC source or sink 100mA relay only.
  • High-speed, low-power “green” processor and ancillary circuitry with a power consumption of >400mA per channel.
  • 24 VDC is used for powering external controls (PWS-20P or PWS-70P).
  • No laptop required for setup.
  • Optional BMS or network node ready.
  • Built to comply with UL508A standard.
  • Patent protected.

Technical Specifications

  • 1.0 Capable of handling dimmers and relays in the same enclosure.
  • 1.1 On power-up, the panel will perform a self-test.
  • 1.2 Supports dimming for incandescent, quartz, and LED dimmable fixtures.
  • 1.3 Powered from 120/208 VAC 3-Phase 5-Wire or 120/240 VAC 1-Phase 4-Wire.
  • 1.4 Includes a capacitive touch interface for ease of setup and monitoring. All programming shall be via a user-friendly, intuitive, and self-prompting menu structure. No PC or special software will be required.
  • 1.5 DMX-512 start shall be addressable in single channel (offset) or individually (patch) per circuit/dimmer/channel basis. It is possible to address any dimmer to any channel within the entire DMX-512 universe or all dimmers to a single DMX channel.
  • 1.6 DMX In and DMX Thru ports via internal 3-Pin break-away connectors.
  • 1.7 Over-temperature indication will illuminate a fan symbol at an internal temperature of 40°C. There will be an automatic shutdown of all the dimmer circuits at 70°C.
  • 1.8 System-on-a-chip control electronics on a single PCB capable of driving 4 channels. Advanced hardware and firmware will ensure >1% accuracy on all dimmer outputs.
  • 1.9 DMX inputs comply with USITT DMX-512-A (ANSI E1.11-2008), the standard protocol for digital data control.
  • 1.10 Capable of reading the system AC voltage and frequency on the UIB.
  • 1.11 Read the individual channel loading in Watts.
  • 1.12 Capable of reading the complete loading of the panel in Watts.
  • 1.13 Capable of adjusting the curve/trip set.
  • 1.14 Self-configuring module types can be enabled by pressing a single button.
  • 1.15 User and admin password for the protection of configuration data.
  • 1.16 Display the Firmware version on the UIB.
  • 1.17 Reset the panel controller via the UIB.
  • 1.18 Select channels for the fire alarm to be activated at full on in the event of a fire alarm.
  • 1.19 Lockable hinged lid.
  • 2.0 Printed circuit boards (PCBs) shall be FR4/G10 with a UL 94V-0 Flame Class Rating.
  • 2.1 ETL listed and complies with UL508A and CSA.

Technical Documentation

Datasheet.pdf Download
User Manual.pdf Download

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Frequently Asked Questions

Yes. At JSI Manufacturing, our lighting control relay panels can be custom-built at the factory with the modules of your choice pre-installed in your specified order. This flexibility ensures your panel is ready for installation and tailored to your facility’s specific needs, saving time and simplifying setup.

At JSI Manufacturing, we specialize in retrofit lighting control for systems of all ages, even those with discontinued parts. Whether your system dates back to the 1980s or earlier, we have the expertise to provide solutions that match or exceed the functionality of your current system.

Our retrofit options are cost-effective, compatible with many legacy systems, and designed for reliable performance in commercial, industrial, and theatrical environments.

Contact us to discuss how we can upgrade your decades-old lighting control system with our relay panels and other lighting control parts to enhance its performance.

Presidor™ lighting control relay panels provide reliable performance while minimizing installation and maintenance costs. As a retrofit solution, their compatibility with a wide range of systems helps extend the life of your existing infrastructure. By upgrading or replacing only the necessary components, you can avoid the expense of a full system replacement.

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