MID-7604 Accessory Guide 20 www.natinst.comSpecificationsThe following specifications apply only to the MID-7604/7602. To obtaina system specification, you must account for your motion controller. Pleaserefer to your controller specifications to determine overall systemspecifications.Some signals have compatibility defined as signal pass-through. Thismeans the MID-7604/7602 may have passive filtering on these signals butwill not affect the voltage range or current handling capability. Consultyour motion controller specifications to determine the allowable voltagerange and logic level compatibility of the signal.Stepper Drive AmplifierType ........................................................IM481H modular hybrid,bipolar chopperChopping frequency ...............................20 kHzMotor bus voltage ...................................24 VDC nominalCurrent per phase....................................0.20–1.4 A peak (0.14–1 A RMS)(factory setting is 0.50 A peak)Microstepping selections ........................×2, 4, 8, 16, 32, 64, 128, 256×5, 10, 25, 50, 125, 250(factory default is ×10microsteps/step)Encoder InterfaceInputs ......................................................Quadrature, incrementalDifferential input threshold ....................± 0.3V (typical)Single ended input threshold ..................TTL/CMOSVoltage range..........................................0–5 VDCNoise filter (RC time constant)...............100 nsMaximum quadrature frequency.............1 MHzLimit and Home Switch InputsVoltage range..........................................0–12 VDCCompatibility ..........................................Signal pass-through