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GMD is the name of a series of bipolar chopper drives, suitable for driving two-phase stepping motors, with four, six or eight terminals. GMD drives are realized in single EUROPA format cards (100 x 160 mm.) and are equipped with a 32 pole, DIN 41612 form D connector. They are therefore designed to be assembled inside a RACK, complete with motherboard, that could be possibly supplied as an option by R.T.A. R.T.A. experience, together with a careful design for these specific purposes, has led to a very reliable component, easy to use, with a competitive cost and offering best performances. The wide range of current and voltage values permits to optimize the use of model of stepping motor, in a great variety of applications. GMD series drives, with every Particular care has been dedicated also to obtain top performance and low power losses for both the card and the motor, limiting the need for forced ventilation, while the standard input and output signals facilitate the interface with the most common control systems. Operation at 200, 400 or 800 steps/revolution. Motor phase current setting by means of a DIP-SWITCH. Up to eight possible equidistant values between INF min. and INF max. can be set. Automatic current reduction at motor standstill. Possibility to switch off motor current with an external logic signal. Protection against a short circuit at motor outputs. Protection against under-voltage and over-voltage. Overheating protection. Operation with a single external power supply. High efficiency CHOPPER with MOSFET final stage output. Electronic resonance damping facility. Wide range of possible operating voltages. c VDC range INF min. INF max. Dimensions (VOLT) (AMP) (AMP) (mm.) GMD 02 55 to 85 1.6 6 100x160x45 GMD 03 55 to 85 4 10 100x160x45 GMD 04 95 to 140 5 12 100x160x51 GMD 06 160 to 190 5 12 100x160x51 ORANGE COF LED RED FAU LED YELLOW TER LED 32 DIP-SWITCH c a 2 CURRENT OFF DIRECTION CURRENT REDUCTION AUX 2 STEP IN 6 FUSIBLE 32 POLES DIN 41612-D CONNECTOR Models + 1 GREEN FC LED GREEN HV LED FAULT STEP OUT AUX 1 A AM1 CONNECTOR 2 Vdc A 15 a 30 c GMD 02 GMD 03 B B 15 a 36 - GMD 04 GMD 06 32 Dimensions in millimeters