The DMC-18x2 provides an internal watch dog timer which checks for proper microprocessor operation. The timer toggles the Amplifier Enable Output (AEN), which can be used to switch the amplifiers off in the event of a serious DMC-18x2 failure. The AEN output is normally high. During power-up and if the microprocessor ceases to function properly, the AEN output will go low. The error light will also turn on at this stage. A reset is required to restore the DMC-18x2 to normal operation. Consult the factory for a Return Materials Authorization (RMA) Number if your DMC18x2 is damaged.
Elements You Need
Before you start, you must get all the necessary system elements. These include: 1. DMC-1812, 1822, 1832, or DMC-1842 Motion Controller, (1) 100-pin cable, and (1) interconnect module (either ICM/AMP-1900 or ICM-2900). 2. Servo Motors with Optical Encoder (one per axis) or Stepper Motors. 3. Power Amplifiers. 4. Power Supply for Amplifiers. 5. PC (Personal Computer - PCI bus). 6. Communications Software – DMCTERM, DMCWIN32, or WSDK32 (On Galil Software CD, or download at http://www.galilmc.com/support/download.html). The motors may be servo (brush type or brushless) or steppers. The amplifiers should be suitable for the motor and may be linear or pulse-width-modulated. An amplifier may have current feedback, voltage feedback or velocity feedback.
For servo motors in current mode
the amplifiers should accept an analog signal in the +/-10 Volt range as a command. The amplifier gain should be set such that a +10V command will generate the maximum required current. For example, if the peak motor current is 10A, the amplifier gain should be 1 A/V. For velocity mode amplifiers, a command signal of 10 Volts should run the motor at the maximum required speed. Set the velocity gain so that an input signal of 10V, runs the motor at the maximum required speed. For step motors, the amplifiers should accept step and direction signals. For start-up of a step motor system refer to “Connecting Step Motors” on page 20. The WSDK software is highly recommended for first time users of the DMC-18x2. It provides stepby-step instructions for system setup, tuning and analysis.
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