Description Purpose and application The DALI MCU digital potentiometer controls up to 25 DALI electronic control gears and enables the manual operation of luminaires with a DALI interface. DALI MCU The potentiometer is mounted in flush device boxes. Function The potentiometer converts rotations of and pressure on the rotary knob into DALI commands. By switching multiple DALI MCU in parallel, the number of control locations or the number of controllable luminaires can be increased. If multiple potentiometers are switched in parallel, the commands of the potentiometer actuated last apply. Automatic synchronization makes it possible to change the control location without disturbing effects (e.g. brightness fluctuations). The DALI MCU can be supplied directly from the DALI control line (= passive operation) or can deliver the required control current itself when connected to the mains voltage (= active operation). Design The potentiometer is made up of the following components: Digital potentiometer Fitting instructions • Rotary potentiometer (A) • Connections (B) A –– Control line (da+, da–) –– Neutral conductor (N) –– Phase (L) • Housing with rotary knob (C) da+ da- L N B C Installation Safety instructions The potentiometer must only be installed and put into operation by a qualified electrician. The applicable safety regulations and accident prevention regulations must be observed. WARNING! Exposed, live cables. Danger of electric shock! • Only work on the potentiometer when it is deenergised. CAUTION! Destruction of the potentiometer and other devices through incorrect mounting! • The potentiometer is designed for mounting in flush device boxes. If mounted elsewhere, provideadequate cable strain relief and insulation. • Do not wire the control line with an external voltage, especially not a mains voltage of 230 V. • Do not exceed the maximum number of ECGs and total line length. IV 2009 DALI_MCU_ma0904en_we1.01.indd OSRAM GmbH Kunden Service Center Customer-Service-Center (CSC) Steinerne Furt 62 86167 Augsburg Germany Tel : +49 (0) 1803 677 - 200 (kostenpflichtig / charges apply) Fax.: +49 (0) 1803 677 - 202 www.osram.com www.osram.de 40083211897216 4008321189721 Continued on the back page! Connecting the potentiometer Installation (cont.) To control DALI ECGs, a maximum of 4 active potentiometers can be connected in parallel. LN • 1 active potentiometer: max. 25 ECGs C • 2 active potentiometers: max. 50 ECGs L N • 3 active potentiometers: max. 75 ECGs ~ ~ • 4 active potentiometers: max. 100 ECGs DALI EVG da da CActive potentiometer (with mains connection) DPassive potentiometer (without mains connection) da + da - L N L N ~ ~ DALI EVG da da D da + da - L N Appendix Technical data Operating voltage 230 V AC, 50-60 Hz Maximum total length of signal line 300 m DALI connection Max. 25 DALI ECG with one active DALI MCU Maximum power consumption 3 W Permissible line cross section 1 – 4 mm² Permissible ambient temperature 0 °C to 50 °C Protection type IP 20 Protection class II Dimensions Flush-mounted part (Ø x H): 51 x 32 mm Mounting plate (L x W): 71 x 71 mm Dimensions 50 4 32 71 da+ da- L N 51 71 The requirements as per EN 60928 und EN 61547 are fulfilled. Conformity with the relevant EU directives is confirmed by the CE symbol.