CLS40, CLS50 Low-Voltage SELV (LED Class 2) Programmable LED Drivers

Transcription

1 CLS40, CLS50 Low-Voltage SELV (LED Class 2) Programmable LED Drivers Applications Manual Prepared by: Steven Briggs Version May 2018 Tyler Close Normanton Wakefield WF6 1RL

2 Table of Contents Introduction... 3 Safety Warnings... 3 Product Specification... 4 Connection diagram, DALI Dimming... 5 Connection Diagram, Touch Dimming... 5 Connection Diagram, Switch Dimming... 5 Connection diagram, 1-10V Dimming... 5 Dimming Isolation (CE / ENEC Approvals)... 6 Dimming Isolation (Americas, UL Approvals)... 6 Connection diagram, EyeNut... 6 Dimensions and Fixing Centres... 6 Output Current Setting... 7 Resistor Output Current Setting, I-set... 7 I-set Resistor Choice... 8 Current Accuracy... 9 Rset Out of Range... 9 Software Programmable Settings... 9 Maximum Current... 9 Minimum Current (1-10V) Minimum Current (DALI) Voltage Limit Dim to Off (1-10V only) Lin / Log Dimming (1-10V only) DC Emergency Mode Iset Disable Iset Thermal Limiting DALI Automatic Mode Selection Touch Dim Switch Dim Analogue (0-10V,1-10V) Dim EyeNut Control Electromagnetic Compatibility Precautions Breaker Information Input Overvoltage Withstand Thermal Protection Reliability Lifetime Contact Us Page 2 of 15

3 Introduction The CLS40 and CLS50 SELV range of LED drivers provide a compact, low-profile and efficient solution for modern LED luminaires replacing traditional fluorescent form-factors. The CLS is available as DALI, 1-10V dimming and EyeNut controlled versions. Output current is programmable, by either an I-Set resistor, or by software programming with Harvard tools. The DALI model provide support for Touch Dimming and Switch Dimming (AKA Corridor Function). NOTE do not confuse this SELV output range of CLS drivers (CLSxx-xxxxx-xxx-B-I), with the nonisolated high-voltage drivers (CLSxx-xxxxx-xxx-B-NI). Safety Warnings Do not touch Live Parts Do not use drivers with damaged casing and/or connectors Do not use drivers with damaged wiring Class I luminaires must be connected to protective earth. Do not service the driver when mains voltage is connected Do not disconnect or reconnect the LED load with mains power present The luminaire manufacturer is responsible for its own luminaire design and compliance with relevant safety standards The Harvard CLZ LED drivers are intended for indoor use and should not be exposed to rain, snow or ice. It is the luminaire manufacturers responsibility to prevent exposure Page 3 of 15

4 Product Specification Model CLS40-700D -UNI-B-I CLS40-700A -UNI-B-I CLS40-700E -UNI-B-I CLS D -UNI-B-I CLS A -UNI-B-I CLS E -UNI-B-I Resistor Current Programming Software Current Programming DALI Dimming Control Analogue Dimming Control (1-10V) Eyenut Dimming Control Dimming Range 1-100% 1-100% 1-100% 1-100% 1-100% 1-100% 100% Output Current mA mA Output Current Accuracy ±5% (typical±2%) Input Voltage (Nominals) 120, , 277 Vac Input Voltage (Maximum Range) Vac Input Current (maximum) 0.4, 0.2, 0.18A 0.5, 0.25, 0.21A Input Power 46W max 58W max Leakage Current Power Factor (typical, full load) 0.99 (120 Vac) 0.95 (277 Vac) Input Frequency 0 /47-63 Hz DC Operation Vdc Inrush Current Typ 50A / <200us Surge Protection 2KV Differential, 4KV Common mode 100/120Hz Output Ripple <1% Operational Output Voltage Range Vdc Open Circuit Voltage 59.4Vdc typ; 60 Vdc Max Output Insulation to Earth Basic Thermal Protection Gradual reduction of output current above Tc=85C Terminals Push-wire for stranded or solid wire Wire size mm² Ingress Protection (IP) Classification 20 Standards Compliance EN :2008+A2:20013 EN :2014 EN :2014 EN :2013 EN61547:2009 EN55015:2006+A1:2009 EN62384:2006+A1:2009 UL8750 Approvals CE, ENEC, UL Page 4 of 15

5 Connection diagram, DALI Dimming Connection Diagram, Touch Dimming Connection Diagram, Switch Dimming Connection diagram, 1-10V Dimming Page 5 of 15

6 Dimming Isolation (CE / ENEC Approvals) DALI and 1-10V control ports are classified as FELV (Functional Extra Low Voltage) and provided with BASIC insulation to mains and SUPPLEMENTARY insulation to output terminals, in accordance with EN As such, control circuits can be wired alongside the supply, or with supply & control multipole connectors. Dimming Isolation (Americas, UL Approvals) Control circuits may be wired as either Class 1 or Class 2 methods. Connection diagram, EyeNut Dimensions and Fixing Centres Page 6 of 15

7 Output Voltage / V Output Current Setting The output current of CLS40/50 drivers is programmable by two methods :- Installation of a resistor at the I-set terminals Software programming with the Harvard Programmable Driver Interface (PDI) tool and appropriate programing jig, available from Harvard. The CLS and CLS allow any current application between 200mA and 1400mA CLS40 and CLS50 Operating Range CLS50 CLS Output Current / ma The CLS A has restricted output voltage above 840mA, in line with the maximum power limit of 50W. The maximum usable voltage is Vmax = Pmax / Iout Such that at 1400mA, the maximum output voltage is 35.7V Note the driver automatically controls the maximum (open circuit) voltage to comply with the maximum power limit at the programmed output current. Resistor Output Current Setting, I-set The I-set port allows a resistor to be directly connected at the port, or to be fitted to the LED module connected to the driver. Putting the resistor on the LED module has the advantage that current is always matched to the requirements of the LEDs. The driver output current is given by Iout = 1000 X Iset The I-set port is driven from a 5V source, so that Page 7 of 15

8 And thus Iset = 5 / Rset Iout = 5000 / Rset (Iout in AMPS, Rset in Ohms) Rearranging Rset = 5000 / Iout I-set Resistor Choice Ideally 1% tolerance resistors should be used, choosing from the E96 range of values will give the closest match to the exact value required. Surface mount resistors may be used on LED modules (from 0402 to 1206 size). For direct fitting to the driver terminals, standard metal film axial resistors are recommended, typically the 1/8W or 1/4W size. Common values for current and programming resistor combinations are shown below:- Target Output Current Target Output Current Ideal Rset Nearest E96 Actual Current Ideal Rset Nearest E96 Actual Current ma Ohms Kohms ma ma Ohms Kohms ma Page 8 of 15

9 Current Accuracy Current accuracy at full output or software programmed is typically within ±2%. Accuracy with I- set resistive programming is typically within ±4%. Rset Out of Range In order to protect the driver and LEDs against misuse or faulty connections, the operation range of the I-set port is limited. Rset too low or short circuit (requested current too high) Above 115% of Iomax demanded by the I-Set port, the driver will provide Iomin, the minimum rated current setting of the driver. CLS : Iomin = 200mA CLS : Iomin = 700mA Rset too high or open (requested current too low) Below 50% of Iomin demanded of the driver, the driver will provide 50% Iomin. CLS : 50% Iomin = 100mA CLS : 50% Iomin = 350mA NOTE if no resistor is fitted to I-set (i.e Rset is open circuit), then the driver will only output the above 50% Iomin current. Where software programming of output current is being used, then operation of the I-set port can be switched off (see Programmable Options ), so that no resistor is required. Software Programmable Settings A PC and the Harvard Technology Programmable Driver Interface (PDI) solution may be used to define the operating current of a CLS driver. Several other parameters and options may also be configured. Two solutions are available :- For a high volume production environment, a quick action programming fixture is available from Harvard that connects to a PC via USB, the driver is simply located on to the fixture and will be programmed automatically. For low volume environment or evaluation purposes, an interface box (the Harvard Programmer) may be plugged into a PC via USB and manually plugged into each driver s programming connecter. There is no need to apply separate power to the driver. Maximum Current The maximum operational current can be set in 1mA increments. If the I-set port is used simultaneously, then the lowest of the two current settings will be used. Page 9 of 15

10 Minimum Current (1-10V) The minimum current (i.e. at minimum input on the 1-10V dimming port) can be programmed, adjusting the bottom end point of the dimming curve. This may be used to restrict the minimum light a user can select in a given area, or to match other drivers on the same dimmer that cannot achieve the 1% dimming performance of the CLS50. Minimum Current (DALI) Minimum current on DALI driver can be set with the Min Level command on a DALI controller. Voltage Limit The CLS driver has the capability to limit the open circuit output voltage. Normally a constant current LED driver will be operating at a voltage determined by the LED characteristics at the drive current used, which is usually well below open circuit voltage. Additional fault protection may be achieved by setting the open circuit voltage just above (say +2V) the worst case LED string forward voltage, Vf. Always taking into account worst case LED Vf binning and (low) temperature when calculating Vf. The voltage cap allows the CLS to be used as a crude constant voltage driver, say at 24 or 48V. This may be useful for certain applications, such as flexi-tape mounted LED strips that use a number of series LEDs and a current limit resistor in groups along the strip. Such strips typically require 12V or 24V drive. Note that dimming may not work very well or at all in such applications. Dim to Off (1-10V only) The Dim to Off feature can be enabled with the PDI tools. With the feature enabled, at <0.5V on the dimming port, the driver will switch off the output and enter a low power standby mode. Raising the dimming port above 0.75V will switch the output back on. By default, the feature in NOT enabled, and the output to the LED will remain at minimum current at <1V on the dimming port. Lin / Log Dimming (1-10V only) The PDI allows the selection of a linear (default) or logarithmic dimming curve. The logarithmic curve provides a dimming experience tuned to the response of the human eye. Page 10 of 15

11 Driver Output % CLS Lin / Log Dimming Curves Lin Log V DImmer Input Note DALI systems are by default Log dimming, although a linear curve may be selected by the DALI controller system (not via the PDI). DC Emergency Mode The CLS supports automatic detection of the presence of DC supply voltages at the input terminals. This is intended for use on central battery type emergency lighting systems that switch over from normal AC mains to DC battery support in the event of general AC supply failure. If DC detection is enabled (default condition), then when DC is detected, the driver output will switch to 10%. Dimming inputs are ignored, and even if the driver is in standby mode due to dim to Off being enabled, the driver will switch on at 10% output, thus illuminating all areas in an emergency situation. When the input supply returns to AC, normal operation will resume. DC detection can be switched off with PDI if not required, such as when normal operation is need on DC supplies. Iset Disable As noted in Resistive Current Programming I-set above, the driver will default to a reduced output if no resistor is detected at the I-set port. In situations where the PDI is used to program the output current, the I-set port may be disabled so that it is not then necessary to fit a resistor. Note, of course, this would also prevent the I-set port being used for LED thermal limiting. Iset Thermal Limiting If the I-set resistor is placed on the light engine PCB, then additional circuitry can be added to allow over-temperature protection of the LEDs. I-set allows control of the driver output to 50% Iomin, the margin between Iomin and 50% Iomin allows LED current to be reduced in an overtemperature situation. The I-Set negative connection is common with LED negative, so if wires are relatively short (<1m) then there is no need to use a separate negative connection for the I-set, i.e. only 3 wires are needed to the light engine (LED+, LED-, I-set+). Page 11 of 15

12 DALI The CLS is compliant to DALI (Digitally Addressable Lighting Interface) standard EN62386, acting as Device Type 6 (LED Module). The DALI control bus should be connected to the DA terminals on the driver. Polarity is not important. Automatic Mode Selection Selection of DALI, Touch Dim or Switch Dim is automatic depending upon the nature of the signals present on the control port. Mains power to the driver will need to be removed for >20 seconds if changing control modes (i.e. DALI to Touch/Switch Dim and vice versa). Touch Dim Touch Dim provides a simple dimming facility that can control multiple units in parallel, giving on/off and dimming control by means of a single switch. The mains supply voltage is permanently connected to the driver, while the control inputs (DA/LS, DA/N) are connected to mains via a momentary (i.e. non-latching push-to-make switch or similar). A short push of the switch will toggle the light on or off. If the switch is held on, the light will fade up or down, alternating direction with each push of the switch. Touch Dim Operation Contact Duration Driver Response Ignore 0 to 40ms Ignore Short push 40 to 400ms Toggle on/off Long push 400 to 10,000ms Dim up or down Reset push >10,000ms Driver Reset If the mains supply is interrupted, the driver will restore the previous condition (light on/off status, level and fade direction) when the mains supply returns. If a lighting system is extended, modified or otherwise disturbed, it is possible drivers may no longer be synchronized for light state, level or direction. To solve this problem, all drivers on a system can be reset to the same state by pressing the control switch for longer than 10 seconds. At 10 seconds, all drivers will jump to 50% output and next fade direction will be downwards. Switch Dim Switch dim is useful for areas of low or occasional occupancy, i.e. corridors and such like. Usually, a switched mains signal is taken from a PIR occupancy sensor to the control inputs (DA/LS, DA/N) of the driver. With no signal present, the driver will output 10% current. When triggered by the sensor, the driver will quickly fade up the lights to 100%, and remain at 100% while the control input is activated. When the control signal terminates, the lights will slowly fade back to 10%. In order to activate switch Switch Dim, the control input must be held active (with a mains signal) for greater than 4 minutes. The driver will then switch to, and subsequently remember, it is in Switch Dim mode. The activation can be easily achieved, by for example, walking around the area and keeping the PIR sensors activated for that period of time. Should a driver accidentally get into Switch Dim mode on a Touch Dim system, then 3 very brief button presses in less than 2 seconds will clear the driver back to Touch Dim mode. Page 12 of 15

13 Analogue (0-10V,1-10V) Dim This is a traditional way of controlling lighting systems. The output of the driver may be adjusted between 1% and 100% output by application of 1-10V control signal. The control interface meets the requirements of IEC60929 Ed 3 Annex E. Between 0 and 1V : Output current is Minimum (see also Dim to Off setting) Between 1V and 10V : Output current varies between minimum and 100% Between 10V and 11V : Output current is 100%. The CLS driver sources uA at its dimming port terminals, so the dimmer must be capable of sinking this current, or the combined current of multiple drivers connected in parallel. Unfortunately, not all 1-10V dimmers on the market are fully compatible with the standard, so operation should be checked prior to final specification of an installation. The driver is generally compatible with systems classed as 0-10V, although the dimmer needs to be capable of sinking current (i.e. conventional current flow FROM driver TO dimmer). Again, operation with the chosen dimmer should be verified. EyeNut Control EyeNut is the Harvard Technology s web-based, wireless control, monitoring and management system for indoor lighting. It utilizes the 2.4Ghz ZigBee wireless protocol to connect lighting with switches, sensors and other controls in an mesh networking configuration. The CLS40-700E and CLS E are enabled for connection the Harvard Pebble wireless node adaptor (Part Number WLP-S1-A). Driver current may still be programmed either by Iset resistor or using the Harvard PDI. Please refer to appropriate documentation associated with the EyeNut system. Electromagnetic Compatibility Precautions The CLS is a Class 1 product, with an earthed metal case, and as such it is designed to be built into luminaires of metallic construction. It is essential that the LED module PCB is mounted onto earthed metal, connected to driver earth, to ensure high frequency noise currents return directly to the driver. Good practice should be followed, i.e. Internal wiring should be kept as short as practical. Supply and LED wiring should be kept at least 50mm apart. LED wiring should not exceed 2m in length. Page 13 of 15

14 Breaker Information The maximum number of drivers that can be powered from a single breaker is based on a minimum mains voltage of 198Vrms or 108Vrms and taking into account inrush current surges. Unit / Supply 6A Type B 10A Type B 16A Type B 6A Type C 10A Type C 16A Type C CLS40, CLS50, 230Vac CLS40, 120Vac CLS50, 120Vac Input Overvoltage Withstand The maximum input voltage the unit is guaranteed to meet specification is 305Vrms. Above this voltage the limitation is the Voltage Dependent Resistor (VDR) across the live and neutral inputs, this has a rated voltage of 320Vrms and starts to conduct significant currents above 350Vrms, testing has shown they will fail destructively at around Vrms causing the input fuse to fail. The VDR is fitted to attenuate lightning induced surges i.e. the electromagnetic field from lightning discharge induces a very short high voltage low impedance pulse on the mains supply. Thermal Protection The CLS40/50 incorporates an internal temperature sensor the will gradually reduce the output current, thus reducing the dissipation in the driver and especially in the associated LEDs and luminaire housing. When used as intended as an integral (built in) driver to a luminaire, the thermal control will help protect both the driver and the LED s from excessive temperature conditions. Reliability MTBF (Mean Time Between Failures). The MTBF calculated using MIL-HDBK 217F is around hours with the driver with an ambient temperature of 50 C (Tc =75 C). Experience has shown that predictions using this method tend to be pessimistic with the real MTBF substantially longer. MTBF figures are very dependent on actual service conditions especially temperature and humidity and are almost impossible to predict with any accuracy. Lifetime Whilst the MTBF calculation deals with the random failures in a field population the lifetime looks at component wear out. In the CLS drivers the main components of interest are the electrolytic capacitors where the dielectric liquid within the capacitors migrates slowly over time as its molecules permeate through the seals around the leads. As a rule of thumb the rate of evaporation doubles with every 10 C rise in temperature. Page 14 of 15

15 The high quality capacitors used within the CLS range have a minimum life of 8,000 hours at 105 C. Capacitor manufactures deem end of life when their capacitance has fallen by 20 or 30% (depending on manufacturer) from their initial value. Based on measured temperatures and ripple current factors, the lifetime of the electrolytic capacitors has been calculated as follows :- Ambient Case Lifetime, Lifetime, Hours Temperature Tc 12hrs/day 30 C 62 C C 72 C C 82 C Contact Us techsupport@harvardtechnology.com Address: Harvard Engineering PLC, Tyler Close, Normanton, West Yorkshire, WF61RL, United Kingdom. Website: Telephone: +44 (0) E&OE Page 15 of 15