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NI ISM-7401/7402 User Manual

Step Size

The NI ISM-7401/7402 requires a source of step pulses to command motion. This source can be
a PLC, an indexer, a motion controller, or another type of device that can produce step pulses
with a frequency proportional to the desired motor speed. The source must also be able to
smoothly ramp the step speed up and down to produce smooth motor acceleration and
deceleration.

Smaller step sizes result in smoother motion and more precise speed, but also require a higher
step pulse frequency to achieve maximum speed. The smallest step size is 1/25,600th of a motor
turn. To command a motor speed of 50 revolutions per second (3000 rpm) the step pulse
frequency must be 50 × 25,000 = 1.25 MHz. The NI ISM-7401/7402 provides sixteen different
settings for steps per revolution as illustrated in the following figure.

Select the steps per revolution setting that best suits your system capabilities.

Figure 20.

Configuring Step Size on Switches 1, 2,

3

, and 4

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13
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Содержание NI ISM-7401

Страница 1: ...onnection Examples STEP DIR 9 Connection Examples EN 9 Connecting the Digital Output 10 Using the Optional Encoder 12 Configuring the NI ISM 7401 7402 12 Setting the Current 12 Setting Idle Current 13...

Страница 2: ...nto the connector Source of step signals such as a PLC or motion controller Refer to Choosing a Power Supply for more information AMPLIFIER 12 60 VDC from external power supply Status LEDs Step Pulse...

Страница 3: ...efer to the Heating section for more information Caution Never use your NI ISM 7401 7402 in a space where there is no airflow or where other devices cause the surrounding air to be higher than 40 C Ca...

Страница 4: ...everse the wires Reverse connection will damage your drive and void your warranty When you rapidly decelerate a load from a high speed much of the kinetic energy of that load transfers back to the pow...

Страница 5: ...National Instruments 5 Current The following charts list the maximum current required for each motor at several common power supply voltages Note Full load curves are abbreviated because of the speed...

Страница 6: ...6 ni com NI ISM 7401 7402 User Manual...

Страница 7: ...nergy of that load is transferred back to the power supply This can trip the overvoltage protection of a switching power supply causing it to shut down Unregulated power supplies are better suited for...

Страница 8: ...o 24 V logic DIR High speed digital input for the direction signal 5 V to 24 V logic EN 5 V to 24 V input for commanding the removal of power from the motor Note To convert STEP and DIR inputs to STEP...

Страница 9: ...Outputs Figure 7 Connecting to Indexer with Sinking Outputs Figure 8 Connecting to Indexer with Differential Outputs Connection Examples EN Connecting the Enable input as shown in Figure 9 causes the...

Страница 10: ...When the proximity sensor activates the input closes Connecting the Digital Output The NI ISM 7401 7402 has a digital output labeled OUT This output closes to signal a fault condition Figure 12 Intern...

Страница 11: ...ments 11 Diagrams of each type of connection follow Caution Do not connect the output to more than 30 VDC The current through the output terminal must not exceed 80 mA Figure 13 Sinking Output Figure...

Страница 12: ...t the encoder signals to your controller NI recommends using a shielded cable with four or five twisted pairs for improved noise immunity Figure 16 NI ISM 7401 7402 Encoder Connector Configuring the N...

Страница 13: ...5 Some applications such as those supporting a vertical load require a high holding torque In such cases set the idle current to 90 as shown in the following figure Figure 18 Configuring Idle Current...

Страница 14: ...eration and deceleration Smaller step sizes result in smoother motion and more precise speed but also require a higher step pulse frequency to achieve maximum speed The smallest step size is 1 25 600t...

Страница 15: ...uses a command filter which causes a slight delay or lag in the motion The following figure shows an example of the delay that can occur from using the step smoothing filter Figure 22 Delay Due to Fil...

Страница 16: ...of steps per revolution in combination with high motor speeds you may be commanding the drive at step rates above 150 kHz In such cases you should set switch 5 to the OFF position as shown below Figur...

Страница 17: ...nts 17 Figure 25 Configuring Self Test on Switch 4 Reference Materials Torque Speed Curves Figure 26 Torque Curve for NI ISM 7401 ISM 7401Torque at 5A phase 12V 24V 48V 120 140 80 100 120 oz in 40 60...

Страница 18: ...7402 at commonly used power supply voltages Refer to these curves when planning your application Use the charts depicting typical power dissipation when planning the thermal design of your applicatio...

Страница 19: ...NI ISM 7401 7402 User Manual National Instruments 19 Maximum Duty Cycle Figure 28 Duty Cycle for the ISM 7401 Figure 29 Duty Cycle for the ISM 7402...

Страница 20: ...com NI ISM 7401 7402 User Manual Temperature Figure 30 Temperature vs Speed for the NI ISM 7401 Figure 31 Temperature vs Speed for the NI ISM 7402 ISM 7401 Temperature vs Speed ISM 7402 Temperature vs...

Страница 21: ...ational Instruments 21 Power Consumption Figure 32 Power Consumption for the NI ISM 7401 Figure 33 Power Consumption for the NI ISM 7402 5 0A phase Full Load ISM 7401 Power Consumption 5A phase Full L...

Страница 22: ...02 User Manual Power Dissipation Figure 34 Power Dissipation for the NI ISM 7401 Figure 35 Power Dissipation for the NI ISM 7402 5 0A phase Full Load ISM 7401 Power Dissipation 5 0A phase Full Load IS...

Страница 23: ...NI ISM 7401 7402 User Manual National Instruments 23 Mechanical Outlines Figure 36 Mechanical Outline for the NI ISM 7401 Top View Side View Front View Rear View...

Страница 24: ...24 ni com NI ISM 7401 7402 User Manual Figure 37 Mechanical Outline for the NI ISM 7401D Top View Side View Front View Rear View...

Страница 25: ...NI ISM 7401 7402 User Manual National Instruments 25 Figure 38 Mechanical Outline for the NI ISM 7401E Top View Side View Front View Rear View...

Страница 26: ...26 ni com NI ISM 7401 7402 User Manual Figure 39 Mechanical Outline for the NI ISM 7402 Top View Side View Front View Rear View...

Страница 27: ...NI ISM 7401 7402 User Manual National Instruments 27 Figure 40 Mechanical Outline for the NI ISM 7402D Top View Side View Front View Rear View...

Страница 28: ...tions Amplifier Digital MOSFET 16 kHz PWM Protection Over voltage under voltage over current over temperature Supply voltage 12 VDC to 60 VDC Under voltage alarm 10 VDC Over voltage shutdown 75 VDC Ov...

Страница 29: ...kHz setting 0 25 s at 2 MHz setting Fault Output Photodarlington 80 mA 30 VDC max Voltage drop 1 2 V max at 80 mA Physical NI ISM 7401 Size 2 22 in 3 35 in 3 35 in 56 4 mm 85 mm 85 mm not including pi...

Страница 30: ...neration clamp NI SMD 7700 NI part number 748908 01 Power Supply NI PS 12 24 VDC 6 3 A NI part number 748906 01 NI PS 13 48VDC 6 7A NI part number 748907 01 Alarm Codes In the event of a drive fault o...

Страница 31: ...cted data rights as set forth in FAR 52 227 14 DFAR 252 227 7014 and DFAR 252 227 7015 Worldwide Support and Services The NI website is your complete resource for technical support At ni com support y...

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