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Instruction Manual DIN-4T 4-Way Trailing Edge Dimmer 2026 Version 1.0.2
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Contents 1 What is the DIN-4T? 3 1.1 Product image 3 1.2 Features of the DIN-4T 3 1.3 Load Types 3 1.4 Example DIN layout 4 2 Panel Overview 4 3 DIN-LINK Modules 5 4 Installation Instructions 6 5 Servicing the DIN-4T 8 6 Programming the DIN-4T 9 7 LED Diagnostics 9 7.1 Display 9 7.2 Output LEDs 10 8 Installation Guidelines 11 8.1 Electrical Isolation 11 8.2 Mounting 11 8.3 Enclosure and Environmental Protection 11 8.4 Maximum and Minimum Loadings 11 8.5 Overcurrent Protection 11 8.6 Wiring 11 8.7 Ventilation and Cooling 11 8.8 Compatibility 12 8.9 Third-Party Accessories and Equipment 12 DIN-4T Instruction Manual | Page 2 Manual Version 1.0.2
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1 What is the DIN-4T? 1.1 Product image 1.2 Features of the DIN-4T - Four-channel trailing-edge dimmer designed for DIN rail-mounted enclosures. - WK-HUB is required for configuration using Rako Software - Controlled via the Rako Wired Network using keypads such as the WK-MOD or WCM. - Controlled by Rako Wireless Keypads, such as the RK-MOD and RNC, when used in conjunction with a WK-HUB or WRB100. 1.3 Load Types Load Type Examples Maximum Load Trailing Edge LED fittings*: GU10, 200W/Channel integrated, LED tape, driver etc LED Mains halogens, tungsten fittings, etc 400W/Channel Incandescent Electronic transformer, 12V MR16 Gu5.3 300W Halogen etc (cos φ => 0.6) Low Voltage Transformer Defined by IEC/EN 60669-2-5 DIN-4T Instruction Manual | Page 3 Manual Version 1.0.2
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1.4 Example DIN layout 2 Panel Overview DIN-4T Instruction Manual | Page 4 Manual Version 1.0.2
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No. Description 1 The input terminals for the DIN bus. 2 LED indicators and manual test buttons. 3 Supply IN. 4 Load neutral connections. 5 Dimmed load outputs. 6 Locks the DIN-4T to the DIN rail when the clip is pushed up. 7 Seven-segment display for diagnostic feedback. 8 The DIN-4T is identified by its box number set during the programming. 3 DIN-LINK Modules The DIN-LINK is used to communicate with four types of modules: DIN-4T, DIN-8S, DIN-4C and DIN-DLI. Each DIN-LINK module is connected via the DIN bus. The DIN-LINK has a maximum capacity calculated in DIN Power Units (DPU). The maximum DPU per DIN-LINK is 64. Device Description Diagram DPU Four-channel trailing DIN-4T 8 edge dimmer module. It is suitable for controlling mains dimmable loads. DIN-8S Eight-channel relay 8 module for on/off switching. DIN-4C A four-channel 8 curtain and blind controller module. DIN-4T Instruction Manual | Page 5 Manual Version 1.0.2
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DIN-DLI Multi Room DALI 16 Controller 4 Installation Instructions The overall safety of any system incorporating this equipment is the responsibility of the assembler of the end system. A qualified electrician must install the DIN module. Ensure all wiring follows local electrical standards. Use only appropriately rated cables, and secure all connections before powering on. The DIN module must be connected to a mains supply that includes appropriate protective devices. Failure to comply with these requirements may result in damage to the equipment, risk of fire, or electrical hazards. Pull down the DIN clamp at the 1 bottom of the unit to unlock it. Once unlocked, place the 2 DIN-4T over the DIN rail. DIN-4T Instruction Manual | Page 6 Manual Version 1.0.2
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Push the clamp tab up to lock 3 the DIN-4T to the DIN rail. Connect the DIN bus to the 5 top left terminals. DIN-4T Instruction Manual | Page 7 Manual Version 1.0.2
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Connect the input conductors 6 Connect the neutral 7 conductors for the output loads. Connect the live conductors for 8 the output loads. 5 Servicing the DIN-4T The DIN-4T contains no user-serviceable parts; should the unit require a repair, it must be returned via the online form at https://returns.rakocontrols.com/contact/service-returns/ . DIN-4T Instruction Manual | Page 8 Manual Version 1.0.2
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6 Programming the DIN-4T The DIN-4T is programmed using the Rasoft Pro programming software. A WK-HUB is required for any programming of a Rako Wired DIN system. Instructions for this can be found in the Wired System Setup Guide . 7 LED Diagnostics 7.1 Display DIN modules use a seven-segment display for diagnostic information. Bootloader When the DIN module is updating firmware, the device will be put into bootloader. Bootloader Sleep Once a firmware update has commenced, the bootloader will enter Bootloader Sleep and wait for the upgrade to complete. Local Channel When receiving data from the DIN-LINK, the DIN module will flash ‘L.’ when receiving a command. DIN-4T Instruction Manual | Page 9 Manual Version 1.0.2
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Error When the test button is pressed, and there is an error communicating with the DIN module, ‘E’ will appear on the display. 7.2 Output LEDs LED Description Pattern Possible Cause 1 to 4 Bootloader The channel is in Slow Flash ~1 seconds (Channel Specific) bootloader; this occurs during the firmware upgrade process. 1 to 4 Over Temperature The DIN module's Fast Flash ~0.25 seconds (Channel Specific) temperature is monitored; if the temperature is too high, the load will switch off to prevent damage. 1 to 4 Zero-Cross Fault Bypass the load on Double Flash ~0.5 (Channel Specific) a permanent supply seconds every 2 pulses and check that the load is switching. 1 to 4 Overload Intermittent Flash If the current on the (Channel Specific) Protection output is too high for too long, check the total load on the output and reduce it DIN-4T Instruction Manual | Page 10 Manual Version 1.0.2
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8 Installation Guidelines If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. 8.1 Electrical Isolation A disconnect device must be provided in the installation and must be all-pole. It must be clearly labelled and positioned so that it is not obstructed by enclosures, wiring, or heavy equipment, ensuring ease of access for maintenance and emergency disconnection. Ensure the power supply is isolated before starting any installation or maintenance; failure to do so may result in electrical shock or injury. 8.2 Mounting The DIN-4T module is designed for mounting on a DIN rail. Ensure the module is securely mounted within a compliant DIN enclosure. 8.3 Enclosure and Environmental Protection Install the DIN-4T module in a suitably rated enclosure that protects against dust, moisture, and other contaminants according to its environment; failure to do so may lead to damage or malfunction. 8.4 Maximum and Minimum Loadings The load capacity of the DIN-4T module is load-type dependent; refer to the 'Specification' section of the instruction manual to ensure the load is within the specified limits. Exceeding these limits may cause output failure. 8.5 Overcurrent Protection Install appropriate overcurrent protection in line with the module, based on the electrical load and supply, to protect the module from potential short circuits or overloads. 8.6 Wiring All wiring should comply with the current local wiring regulations. This includes selecting the correct cable size, using appropriate termination methods, and ensuring mechanical protection for the wiring. 8.7 Ventilation and Cooling Ensure sufficient ventilation within the DIN enclosure to prevent overheating. Poor ventilation can lead to overheating and module failure. DIN-4T Instruction Manual | Page 11 Manual Version 1.0.2
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8.8 Compatibility Verify that the DIN-4T module is compatible with other electrical components in the system. Incompatibility may result in malfunction, reduced performance, or damage to the module. Do not connect third-party devices to the Rako DIN bus. 8.9 Third-Party Accessories and Equipment The installer is responsible for providing the necessary cables, isolators, electrical loads, and ferrules compatible with the terminals on the DIN-4T unit. Refer to the manufacturer's instructions for all third-party devices. All cables must be appropriately rated for the intended load and comply with the relevant electrical standards. ® Rako and the Rako logo are registered trademarks of Rako Controls Ltd. Unauthorised use of these trademarks is prohibited. All other product names, company names, and logos mentioned herein may be trademarks of their respective owners. DIN-4T Instruction Manual | Page 12 Manual Version 1.0.2
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