Acuity Brands EldoLED POWERdrive 50U-M4Z0X Guía

July 30, 2020

POWERdrive 50W DESIGN GUIDE

 
 
 
 
POWERdrive 50W DESIGN GUIDE –July 30, 2020 
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CONTENTS 
 
1. Introduction...........................................................................................................................................................................3 
2. Electrical Design.....................................................................................................................................................................3 
Output Characteristics.......................................................................................................................................................3 
Electrical Connections .......................................................................................................................................................4 
LED load configurations.....................................................................................................................................................5 
Meeting Title 24/JA8 startup.............................................................................................................................................7 
3. DMX wiring ............................................................................................................................................................................7 
Remote mounting..............................................................................................................................................................7 
Creating DMX IN and DMX OUT connections for the luminaire........................................................................................8 
DMX Wire type ..................................................................................................................................................................9 
Grounding........................................................................................................................................................................10 
DMX Input isolation.........................................................................................................................................................10 
4. Driver protections................................................................................................................................................................10 
5. Mechanical installation........................................................................................................................................................11 
Driver Lifetime .................................................................................................................................................................11 
Sound...............................................................................................................................................................................12 
Grounding........................................................................................................................................................................12 
6. Driver configuration.............................................................................................................................................................12 
Startup and Fail mode .....................................................................................................................................................12 
Group Scaling...................................................................................................................................................................13 
Interpolation....................................................................................................................................................................13 
NTC throttling temperature.............................................................................................................................................14 
Power Scaling...................................................................................................................................................................14 
DMX network settings .....................................................................................................................................................15 
RDM Settings ...................................................................................................................................................................17 
7. Best Practices.......................................................................................................................................................................17 
Troubleshooting ......................................................................................................................................................................18 
References...............................................................................................................................................................................19 
Disclaimer ................................................................................................................................................................................19 
 
 
 
POWERdrive 50W DESIGN GUIDE 

POWERdrive 50W DESIGN GUIDE –July 30, 2020

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1. Introduction

Thank you for your interest in the eldoLED POWERdrive 50W DMX LED driver family. This design guide addresses common

design features, configurations, and performance considerations when designing a luminaire incorporating any one of the

following POWERdrive LED drivers

-POWERdrive 50U-M4Z0X

-POWERdrive 50S-M4Z0X (scheduled for release in a few weeks)

-POWERdrive 50SA-M4Z0X (scheduled for release in a few weeks)

2. Electrical Design

Output Characteristics

A POWERdrive LED driver contains four constant-current LED outputs, that are specifically designed to power LED light

engines. It is not recommended to use a POWERdrive LED driver to power other electronic loads or circuitry; this may

cause unpredictable behavior and/or damage to the POWER LED driver.

Each LED output can support an LED load with a forward voltage up to 55V. The nominal output current for each LED

output can be programmed in 1mA steps between 150mA and 1400mA. Consult the product datasheet for detailed

information on the acceptable operating window of the driver.

The cumulative output power of a POWERdrive LED driver across all four LED outputs cannot exceed 50W. This power

does not have to be evenly distributed, i.e. each LED output can support a different forward voltage and forward current.

The LED outputs of a POWERdrive LED driver can be programmed to be controlled independently, grouped, or disabled.

Between 1 and 4 DMX addresses will be visible to the DMX network based on the programming of the driver. See the

Driver Configuration section for more detailed information.

The POWERdrive LED driver is designed to meet UL Class 2 requirements. This means that each LED output meets these

requirements:

-Output voltage less than 60V

-Output current less than 5A

-Output power less than 100VA

The wiring diagrams in this Design Guide show the physical connector layout for POWERdrive 50U-M4Z0X. Nevertheless, the wiring

guidelines in this Design Guide apply to all the POWERdrive LED driver configurations listed here.

POWERdrive 50W DESIGN GUIDE –July 30, 2020

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Electrical Connections

A POWERdrive LED driver has 16 color-coded connectors (3 for mains, 8 for LED outputs, 3 for DMX, and 2 for LEDcode /

NTC), see Figure 1. Each LED load must have a dedicated (+) and (-) connection to the POWERdrive LED driver. To facilitate

wiring, the LED output (+) connectors are color-coded, with Red, Red, Green, Blue, and Yellow corresponding to LED

outputs 1, 2, 3, and 4, respectively.

The acceptable wire cross section for each connection type is listed in Table 1. Wire sizes outside this range may damage

the connector pole or prevent the wire from making a secure mechanical and/or electrical connection. Smaller wire sizes

can be accommodated in combination with a ferrule, see Figure 2. Insertion of multiple loose wires into a driver terminal

may result in unacceptable mechanical or electrical contact to both wires. Instead, consider using a twin cable ferrule to

connect multiple small wires (e.g. DMX wiring) together for insertion into a connector pole.

POWERdrive

DMX

4 LED group

(4 control channels)

Figure 1: A POWERdrive LED driver has 16 color-coded connector poles. Each LED load must have a dedicated (+) and (-)

connection to the POWERdrive LED driver. The 4 LED outputs that can be programmed to be controlled

independently, grouped, or disabled.

Table 1: Acceptable wire cross section for the various connection types to a POWERdrive LED driver. Note that the

acceptable wire cross section for LED output and LEDcode/NTC are restricted for POWERdrive 50SA-M4Z0X drivers so

the plastic endcap can exert enough clamping force onto the mains cabling.

POWERdrive 50U-M4Z0X

POWERdrive 50S-M4Z0X

POWERdrive 50SA-M4Z0X

Mains power

AWG 20-16

0.5-1.5mm²

AWG 20-16

0.5-1.5mm²

AWG 20-16

0.5-1.5mm²

LED output

AWG 20-16

0.5-1.5mm²

AWG 20-16

0.5-1.5mm²

AWG 20-18

0.5-0.75mm²

LEDcode / NTC

AWG 20-16

0.5-1.5mm²

AWG 20-16

0.5-1.5mm²

AWG 20-18

0.5-0.75mm²

DMX

AWG 24-16

0.2-1.5mm²

AWG 24-16

0.2-1.5mm²

AWG 24-16

0.2-1.5mm²

POWERdrive 50W DESIGN GUIDE –July 30, 2020

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LED load configurations

Each LED output of the POWERdrive LED driver is powered by a separate current source to enable independent control of

each LED output, regardless of the LED load that is connected. However, this flexibility does impose constraints on how

LED light engines can be connected to the LED outputs. Figure 3 shows the acceptable LED load configurations for a

POWERdrive LED driver. Multiple LED light engines can be connected either in series or in parallel if the total LED load (in

terms of cumulative forward voltage and output current) does not fall outside the operating window for each LED output,

as specified in the product datasheet. Any series/parallel connection of LED loads shall be designed considering the

variations in forward voltage and/or current over the full operating range of the luminaire. Figure 4 shows LED load

configurations that are not acceptable for a POWERdrive LED driver. In particular:

-multiple LED outputs cannot be connected in series to power an LED load with a forward voltage > 55V

-multiple LED outputs cannot be connected in parallel to deliver a drive current that exceeds the maximum drive

current that can be delivered by a single LED output

-common-anode or common-cathode configurations are not acceptable.

Cross connecting multiple LED outputs of a POWERdrive LED driver may result in permanent damage to the LED driver

itself and/or the LED light engine(s).

Figure 2: Smaller wire sizes can be accommodated in combination with a ferrule.

POWERdrive

DMX

✓Multiple LED light engines can be connected in parallel to a single LED output

POWERdrive

DMX

✓Multiple LED light engines can be connected in series if the total string voltage remains < 55V

Figure 3: These LED load configurations are acceptable.

POWERdrive 50W DESIGN GUIDE –July 30, 2020

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POWERdrive

DMX

Multiple driver LED outputs cannot be connected in parallel to increase the total drive current through an LED load.

POWERdrive

DMX

Multiple driver LED outputs cannot be connected in series to support an LED load with a forward voltage > 55V.

POWERdrive

DMX

Multiple LED light engines cannot have separate cathodes but share a common anode.

POWERdrive

DMX

Multiple LED light engines cannot have separate anodes but share a common cathode.

Figure 4: These LED output configurations are not acceptable and may result in permanent damage to the POWERdrive

LED driver and/or the LED light engine(s).

POWERdrive 50W DESIGN GUIDE –July 30, 2020

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Meeting Title 24/JA8 startup

The POWERdrive LED driver can meet the startup time requirements as specified in California Title 24/JA8 out of the box,

i.e. there is no need to order a “special” configuration. However, this does require the test setup to meet certain

conditions.

Per the DMX512A standard, a POWERdrive LED driver will wait 1250ms after cold start for a valid DMX control signal to be

presented on the input. If no DMX input is received within 1250ms after cold start, the POWERdrive LED driver will follow

the behavior configured in the Startup Mode settings. If a POWERdrive LED driver detects a live DMX network after cold

start, it will respond to any non-zero DMX setpoint commands within 500ms.

To achieve first-light within 500ms after cold start, the test setup must meet these conditions prior to executing the test:

-the POWERdrive LED driver is connected to a DMX network

-the DMX network is up and running

-the DMX network continuously sends out valid, non-zero setpoint commands to the POWERdrive LED driver

3. DMX wiring

Remote mounting

POWERdrive LED drivers are suitable for remote lighting applications, i.e. applications where the LED driver is not

mounted in or near the luminaire that is powered by the LED driver. From a functional point of view, though, the distance

between a POWERdrive LED driver and the LED light engine(s) should not exceed 100m (384ft).

One key consideration in a remote lighting application is the voltage drop in the cable(s) between the LED driver and the

LED light engine(s). The total load on each LED output (i.e. the sum of the forward voltage of the light engine and the

voltage drop in the cable between driver and light engine), shall not exceed the maximum allowable output voltage of the

POWERdrive LED driver under all expected operating conditions (i.e. low temperature, maximum current, LED binning

variations, etc.).

A large voltage drop in the cabling between a POWERdrive LED driver and LED light engine yields more power loss in the

cabling and reduces the efficiency of the overall luminaire system. When trading off wire cross section and voltage drop in

the cabling, keep in mind that the POWERdrive LED driver only accept wires with certain cross sections, see Table 1. A

good rule of thumb is to limit the voltage drop between an LED driver and the LED load to about 1V.

Table 2 lists the typical remote mounting distance (ft) that can be supported with various combinations of current and

wire size. The distance is based on the voltage drop being less than 1V.

POWERdrive 50W DESIGN GUIDE –July 30, 2020

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It is, in general, best to keep the remote mounting distance as short as possible. Depending on the site and application

requirements in terms of EMI/RFI emissions and susceptibility, one may consider running remote wiring in conduit or

using shielded cables. It is the responsibility of the fixture OEM to validate the design and performance of the fixture

system in the application, including remote-mounted LED driver solutions.

Creating DMX IN and DMX OUT connections for the luminaire

Each POWERdrive LED driver represents one “unit load”on the DMX bus. The DMX standard allows up to 32 “unit loads”

on each bus. If additional drivers are needed on the bus, then a repeater or signal booster is necessary.

DMX utilizes daisy-chain connections between devices on a DMX network. To ensure trouble-free operation, close

attention must be paid to the DMX wiring within a luminaire as well as in the DMX network itself. To facilitate daisy-

chaining of multiple DMX luminaires in a DMX network, each DMX luminaire should provide separate DMX IN and DMX

OUT connections, each containing DMX +, DMX - and DMX SHIELD conductors (all three are required for proper

operation). This can, for example, be accomplished as shown in Figure 5 and . A “T-tap” connection to the DMX terminals

of the POWERdrive LED driver within the luminaire should be made as short as possible, preferably less than 2 -3 inches.

Care must be taken when preparing the DMX cable; the shield/drain wire should not make any contact to any part of the

fixture other than the DMX shield input terminal on the driver. Accidental contact with the fixture body (earth ground)

may result in interference with the DMX signal.

Table 2: Maximum allowable cable distance (in ft) as function of the wire gauge and drive current that keeps the

voltage drop in the cable below 1V.

POWERdrive 50W DESIGN GUIDE –July 30, 2020

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DMX Wire type

The DMX protocol operates over an RS-485 physical layer at 250kbaud. To comply with the standard, cabling with specific

operating characteristics must be used to support this fast, digital signal.

DMX-compliant cables should be used for both the input and output connections to a luminaire. If multiple DMX LED

drivers are used within the same luminaire, DMX-compliant cables should be used between the LED drivers. Best practice

is to provide as much separation as possible between power wires (mains or LED outputs) and DMX signal wires within the

luminaire.

Check the DMX512-A standard for the technical requirements on DMX cabling. In general, a DMX cable contains a twisted

pair with a low capacitance and a nominal characteristic impedance of 120Ω; the cable can be shielded or unshielded. An

example of a DMX-compliant cable is Belden 9841. A category 5 or above network cable is also compliant.

Figure 5: Proper wiring of a DMX fixture is critical to trouble-free operation. To facilitate daisy-chaining of multiple

luminaires in a DMX network, each luminaire should provide separate DMX IN and DMX OUT connections. This can be

accomplished as shown here. The “T-tap” connection to the DMX IN terminals of a POWERdrive LED driver within the

luminaire should be made as short as possible, preferably less than 2 -3 inches.

POWERdrive 50W DESIGN GUIDE –July 30, 2020

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Grounding

Depending on the type of DMX-compliant cable that is used, the DMX shield conductor may be separate from the cable

shield/drain wire. The DMX Shield should only connect to earth ground at the DMX controller. Inside the fixture, the DMX

Shield should only connect to the DMX Shield terminal on the driver. Termination of the DMX cable inside the luminaire

must ensure that the DMX Shield does not come into electrical contact with the fixture body.

DMX Input isolation

The DMX control interface is electrically isolated from the Class 2 LED outputs and mains input. This improves the

robustness of the POWERdrive LED driver against surge events and accidental mis-wiring.

4. Driver protections

The POWERdrive 50W driver has several protection mechanisms to comply with certification standards (e.g. UL Class 2

LED outputs) and to prevent damage to the driver during operation. These protection mechanisms include:

Thermal protection –When the internal LED driver temperature exceeds a factory preset limit, the output

current on all LED outputs is gracefully scaled back until the LED driver temperature drops below this limit. If the

internal LED driver temperature continues to increase, despite a decrease in output current, the LED driver

eventually shuts down when a second temperature threshold is reached. Once the temperature drops below the

threshold, the driver will restart.

Open protection –All LED outputs are turned off whenever the LED driver detects an open circuit on any one of

the LED outputs. The LED driver will automatically attempt a restart every 400ms after an open circuit is

detected.

Ceiling

Pendant

Fixture

DMX +

DMX -

DMX SHIELD

Single cable down stem

Shared DMX

shield/drain conductor

Junction Box

DMX IN DMX OUT

Figure 6: This example shows how a cable with two twisted conductor pairs can be used to bring a DMX signal to a

pendant luminaire, while still minimizing the length of the T tap.

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