National Instruments MID-7602 User Manual And Specifications

Also see for NI MID-7602: Overview User guide User guide User guide

National Instruments MID-7602 User Manual And Specifications Manual pdf 17 page image

MID-7604/7602 Stepper Power Motor Drive User Guide 16 ni.comWhen connecting the encoder wiring to your MID-7604/7602, use shielded wire of at least 24 AWG.Analog noise filters filter the encoder inputs in the MID-7604/7602. You must use cables with twistedpairs and an overall shield for improved noise immunity and enhanced encoder signal integrity. Figure 9shows twisted pairs in a shielded cable.Figure 9. Shielded Twisted PairsNote If you use an unshielded cable, noise can corrupt the encoder signals, resulting in lost counts,reduced accuracy, and other erroneous encoder and controller operation.Limit Switch Terminal BlocksFor end-of-travel limit, home, inhibit input, and inhibit output connections, MID-7604/7602 axes havea separate, 6-position removable screw terminal connector block. Figure 10 shows the limit switchterminal block pin assignments.Figure 10. Limit Switch Terminal Block Pin Assignment(Passive Limit Switch Connection Example)The inhibit output signal is asserted low from the MID-7604/7602 when an axis is inhibited. This signalcan be useful for actuating mechanical brakes or for monitoring an axis status. An axis is inhibited if thehost bus interlock circuitry is activated, if the ENABLE switch on the front panel is in the inhibitposition, if the motion controller’s inhibit signal is low, or if the per-axis inhibit input is actively driven.The MID-7604/7602 stepper drive remains in a reset state for 500 ms after the inhibit is deasserted.Therefore, you can lose steps if you attempt to issue a start motion command within 500 ms from thedeassertion of the stepper drive inhibit. A Kill command asserts the inhibit signal from the controllerand a Halt command deasserts the inhibit signal from the controller. The yellow LEDs (middle row) andred LEDs (top row) on the front panel illuminate if an axis is currently inhibited (killed state).Shield+5 VEncoder IndexEncoder IndexEncoder BEncoder BEncoder ADrainEncoder ADigitalGround162345Forward LimitHome InputInhibit InputDigital GroundReverse LimitInhibit Output