National Instruments ISM-7400 Bedienungsanleitung

USER MANUAL

NI ISM-7400

Integrated Stepper

This manual describes the NI ISM-7400 integrated stepper. It describes electrical and

mechanical characteristics of the devices, as well as I/O functionality.

Contents

Getting Started .......................................................................................................................... 2

Mounting the NI ISM-7400...................................................................................................... 3

Connecting the Power Supply .................................................................................................. 3

Choosing a Power Supply.........................................................................................................4

Voltage.............................................................................................................................. 4

Current .............................................................................................................................. 5

Regeneration ..................................................................................................................... 6

Connecting Input Signals.......................................................................................................... 6

Connection Examples: STEP & DIR................................................................................ 8

Connection Examples: EN................................................................................................ 9

Connecting the Digital Output.................................................................................................. 10

Using the Optional Encoder ..................................................................................................... 11

Configuring the NI ISM-7400 .................................................................................................. 12

Setting the Current............................................................................................................ 12

Setting Idle Current .......................................................................................................... 12

Load Inertia....................................................................................................................... 13

Step Size ........................................................................................................................... 13

Step Pulse Type ................................................................................................................ 16

Step Pulse Noise Filter ..................................................................................................... 16

Self Test .................................................................................................................................... 17

Reference Materials.................................................................................................................. 18

Torque-Speed Curves ....................................................................................................... 18

Heating.............................................................................................................................. 18

Mechanical Outlines ......................................................................................................... 21

Technical Specifications........................................................................................................... 23

Amplifier .......................................................................................................................... 23

Motor ................................................................................................................................ 23

Digital Inputs .................................................................................................................... 24

Fault Output ...................................................................................................................... 24

Physical............................................................................................................................. 24

Incremental Encoder Specifications ................................................................................. 24

Mating Connectors and Accessories................................................................................. 25

Alarm Codes .....................................................................................................................2

Worldwide Support and Services ............................................................................................. 26

2|ni.com |NI ISM-7400 User Manual

Figure 1. Block Diagram

Getting Started

You will need the following items to get started with your NI ISM-7400:

12 VDC to 48 VDC power supply. NI PS-12 (NI part number 748906-01) or NI PS-13

(NI part number 748907-01) recommended.

Source of step signals, such as a PLC or motion controller.

Refer to Choosing a Power Supply for more information.

NI ISM-7400 User Manual |© National Instruments |3

Figure 2 shows an overview of the connectors on the NI ISM-7400 integrated stepper.

Figure 2. NI ISM-7400 Integrated Stepper Connectors

Mounting the NI ISM-7400

Mount your NI ISM-7400 using four M3 screws, the mounting hole depth is 4.5 mm. Securely

fasten the NI ISM-7400 to a smooth, flat metal surface to conduct heat away from the motor. To

prevent overheating, forced airflow from a fan may be required. Refer to the Heating section for

more information.

Caution Never use your NI ISM-7400 in a space where there is no airflow or where

other devices cause the surrounding air to be higher than 40 °C.

Caution Never put the NI ISM-7400 where it can get wet or where metal or other

electrically conductive particles can contact the circuitry.

Caution Always provide air flow around the drive. When mounting multiple NI

ISM-7400 integrated steppers near each other, maintain at least one half inch of space

between devices.

Connecting the Power Supply

Refer to Choosing a Power Supply for more information.

1. Use 0.65 mm diameter (22 AWG) stranded wire for connections.

2. Connect the power supply positive (+) terminal to the connector terminal labeled V+.

3. Connect power supply negative (-) terminal to the connector terminal labeled V-.

1 Status LED

2 DIP Switches (current, idle current, steps/rev, load inertia)

3 Power and I/O Connector

4 Mounting Holes (x4)

4|ni.com |NI ISM-7400 User Manual

The NI ISM-7400 contains an internal fuse that connects to the power supply positive (+)

terminal. This fuse is not user-replaceable. If you want to install a user-replaceable fuse in your

system, install a fast acting 2 A fuse in line with the positive (+) power supply lead. Figure 3

shows the NI ISM-7400 connections.

Figure 3. NI ISM-7400 Connector

Caution Do not reverse 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 power supply. This transfer can trigger the overvoltage protection of a

switching power supply, causing it to shut down. Unregulated power supplies generally do not

have overvoltage protection and have large capacitors for storing energy coming back from the

drive. NI offers the SMD-7700 regeneration clamp, part number 748908-01, to solve this

problem.

Choosing a Power Supply

NI offers two power supplies for the NI ISM-7400:

• NI PS-12 (24 V, 6.3 A)

• NI PS-13 (48 V, 6.7 A)

Voltage

Your motor can provide more torque at higher speeds if you use a higher power supply voltage.

Refer to the speed-torque curves for more information.

Note If you choose an unregulated power supply, ensure the no-load voltage of the

supply does not exceed 50 VDC.

NI ISM-7400 User Manual |© National Instruments |5

Current

The following charts list the maximum current required for each motor at several common

power supply voltages.

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Regeneration

If you plan to use a regulated power supply you may encounter a problem with regeneration. If

you rapidly decelerate a load from a high speed, much of the kinetic energy 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

applications with significant regeneration as they generally do not have overvoltage protection

and have large capacitors for storing energy coming back from the drive. Refer to Connecting

the Power Supply for more information.

Connecting Input Signals

The NI ISM-7400 has three inputs:

•STEP—High-speed digital input for step pulse commands, 5 V to 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 CW and STEP CCW, move switch

#8 to the ON position. Refer to Step Pulse Type for more information.

NI ISM-7400 User Manual |© National Instruments |7

Figure 4. Connector Pin Diagram

Figure 5. Internal Circuit Diagram

8|ni.com |NI ISM-7400 User Manual

Figure 6. Mating Cable Diagram

Connection Examples: STEP & DIR

Figure 7. Connecting to Indexer with Sourcing Outputs

Figure 8. Connecting to Indexer with Sinking Outputs

NI ISM-7400 User Manual |© National Instruments |9

Figure 9. Connecting to Indexer with Differential Outputs

Connection Examples: EN

Connecting the Enable input as shown in Figure 10 causes the drive to disable when the relay is

closed and enable when the relay is open.

Figure 10. Connecting an Input to a Switch or Relay

Connecting the Enable signal as shown in Figures 11 and 12 causes the drive to disable when the

proximity sensor activates.

Figure 11. Connecting an NPN Type Proximity Sensor to an input

Figure 12. Connecting a PNP Type Proximity Sensor to an input

10 |ni.com |NI ISM-7400 User Manual

Connecting the Digital Output

The NI ISM-7400 has a digital output labeled OUT. This output closes to signal a fault condition.

Figure 13. Internal Circuit Diagram

Use this output to drive LEDs, relays, and the inputs of other electronic devices like PLCs. The

positive collector and negative emitter terminals of the output transistor are available at the

connector. This allows you to configure the output for current sourcing or sinking.

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 14. Sinking Output

Figure 15. Sourcing Output

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