General Photonics 32VDC Stepper Motor Driver Board

Specifications:

Electrical Characteristics|
---|---
Power Supply| +12V~+32VDC/1A
Operating Current| <1A
Control Interface| TTL levels and clock signal (see Table 1)
Motor Control Mode| Constant current
Motor Start Frequency| >500 Hz
Motor Running Frequency| >8000 Hz
Motor Coil Control Type| PWM
PWM Frequency| >20 kHz
Stepper Drive Mode| Full step, ½ step, and ¼ step
Directional Control| CW/CCW

Input Logic Signal

| Low: 0-0.6V High 1.6-20V

TTL compatible

Output Logic Signal| 0-5V, TTL compatible
Input Control Signals| Direction, Enable, Clock
Output Signals| Home sensor trigger, far end sensor trigger
Travel Limit Protection| Current disabled when a limit sensor is triggered
Status Indicator LEDs| Power, Direction, Enable, Clock, Forward, Reverse
Physical/Environmental|
Dimensions| 50.9 (L) × 35.5 (W) × 7.6 (H) mm, excluding connectors
Weight| 50g (2 oz)
Input/Output Cables| Power, motor driver, and control
Input Connector (to control circuit)| 8-pin SIP 0.1 inch grid
Output Connector (to motor)| 10-pin dual line 2mm grid
Power Jack| Male barrel power jack ID 1.3mm (positive)

OD 3.8mm (negative)

Operating Temperature| 0 to 50 °C
Storage temperature| −20 to 70 °C
Humidity| Relative humiditiy 85% non condensing

Overview:

This driver board is designed to drive the stepper motor of the MDL-003 Motorized Delay Line. It can also drive any two phase stepper motor whose drive requirements fall within the board’s voltage and current limits.
Note: that all references to the home and far-end sensors apply only if the board is being used with an MDL-003. For the MDL-003, the home sensor indicates the minimum delay position, and the far end sensor indicates the maximum delay position. Forward scanning means that the delay is increasing, and reverse scanning means that the delay is decreasing.

Device Description:

Dimensions
The board has 4 mounting holes, one in each corner of the board. The mounting hole diameter is 1.5mm. The mechanical drawing below is primarily to provide mounting hole location and dimensional information. It does not include the electrical connectors, which may extend beyond the edges of the board.

Figure 1 Mechanical drawing (board only, excluding connectors). Dimensions in mm. Note: Board orientation in this figure is the same as in Figure 2.

Interface and Control

• The functions of the connectors and interfaces in the diagram are described below.
• CN2: Control circuit connector
• If the manual control add-on board is being used, it plugs into this connector.
• If the driver board is being used without the manual control add-on board, then the input pins that need to be connected to control the MDL are pins 1, 2, 3, and 8. Output pins 4 and 5 can be used to monitor the status of the limit sensors. Pin 7 is a +5V power supply for the manual control add-on board. It does not need to be connected if the manual control board is not being used.

Table 1 CN2 connector pinout

High=enable

3| Clock input| I| Clock signal supplied to the board| Controls MDL speed
4| HMTR| O| Home position sensor trigger| Low=not triggered High= triggered
5| FETR| O| Far end position sensor trigger| Low=not triggered

High= triggered

6| Clock output| O| Clock pulse applied to the motor| Output level: TTL
7| +5V| O| Positive 5V power output| Output current limit 50mA
8| Ground| –| System ground|

• P1: Potentiometer for motor drive voltage adjustment
  The motor drive voltage can be adjusted using potentiometer P1. For a motor working in constant current mode, motor output torque is not very sensitive to changes in drive voltage. The voltage is factory preset to 10.5V. In most cases, it is not necessary to change the setting. The voltage range is from 2V to input power voltage minus 1.5V.

• P2: Potentiometer for motor drive current adjustment
  The average motor drive current can be adjusted to fit different load torques using potentiometer P2. Potentiometer P2 adjusts both motor phase currents evenly. The current adjustment range is from 0.05A to 1A. Larger currents can provide larger motor output torques. The current is factory preset to match the requirements of the MDL-003 stepper motor. If the board is being used with an MDL-003, it is not necessary to change the current setting.
  D) CN1: Power supply connector

  • Type: Power jack
  • Inner conductor: Diameter 1.3mm, Positive
  • Outer conductor: Diameter 3.8mm, Negative

• Indicator LEDs
  There are 6 indicator LEDs on the board. Table 2 provides the readout key.

Table 2 LED indicator function description

*| Symbol| Function| Description

---|---|---|---
1| EN| Enable| LED on:           enable signal high
2| CK| Clock| LED on:           receiving input clock signal
3| FE| Far end sensor status| LED off:          far end sensor not connected

LED on:           far end sensor connected LED blinking: far end sensor triggered

4| FW| Direction CCW| LED blinking: motor direction CCW

(control signal TTL high)

5| BW| Direction CW| LED blinking: motor direction CW

(control signal TTL low)

6| HM| Home sensor status| LED off:          home sensor not connected LED on: home sensor connected

LED blinking: home sensor triggered

*LEDs numbered from bottom to top in Figure 2.

2-bit DIP switch for motor step mode selection
This 2-bit DIP switch is for stepper motor step control. The board can drive the motor in full, ½ and ¼ step modes. Fractional modes can be used for smoother motor motion and less noise. The default setting is ¼-step mode.
Bit numbers and ON/OFF status are labeled on the board.

Table 3 Dip switch position key (motor step mode)

**

CN3: MDL-003 (or other stepper motors) drive connector**

Table 4 CN3 connector pinout

If the board is being used to control an MDL-003, the MDL-003 optical head’s electrical cable plugs into this connector.
If the board is being used to control a different stepper motor, pins 1-4 are the two-phase drive signals for the motor.

Device Operation:

Electrical and optical connections are required during setup of an MDL with the stepper motor driver board. Follow safety precautions when making these connections.

Unpacking

• Be careful when unpacking the product from its original packaging.
• If using with an MDL-003, avoid applying any force to optical fiber pigtails, and do not let any free-drop of fiber connectors occur at any time. Excessive force to fiber pigtails may degrade device performance or damage the variable optical delay module. Observe standard ESD precautions when unpacking the board.

Operation

The electrical connections necessary to operate an MDL-003 or other stepper motor using this driver board are shown in Figure 5.

1. Power supply: The board requires +12~+32VDC (1A).

2. MDL-003: The MDL-003 electrical cable plugs directly into the 10-pin connector on the right side of the board, as shown in the figure.

3. Control circuit: The user needs to provide 3 inputs to drive the motor.

   • Enable/Disable signal (pin 2): TTL levels.
     High (5V): enabled
     Low (0V): disabled

   • Clock pulse (pin 3): Square wave TTL levels 0/5V.
     Pulse: , minimum width 2µs
     recommended: 50% duty cycle
     The clock rate controls the MDL scan speed. Depending on the step mode, the motor moves ¼, ½, or 1 full step per clock pulse received.

   • Directional signal (pin 1): TTL levels.
     High: CCW, MDL-003 reverse direction
     Low: CW, MDL-003 forward directionIf the board is being used to drive an MDL-003, the MDL scan status also depends on the state of the home and far end position sensors. With the MDL cable connected to the board, the board will automatically sense the state of the position sensors.

The truth table for MDL-003 motor control is given below.

Table 5 MDL-003 motor control truth table

Position Sensors| Control Input| ****

Motor status

---|---|---
Home| Far end| Direction| Enable| Clock
Dis| X| X| X| X| Stop
X| Dis| X| X| X| Stop
Cond| Cond| L| L| Inactive| Stop
Cond| Cond| L| L| Active| Stop
Cond| Cond| L| H| Inactive| Hold
Cond| Cond| L| H| Active| Forward
Cond| Cond| H| L| Inactive| Stop
Cond| Cond| H| L| Active| Stop
Cond| Cond| H| H| Inactive| Hold
Cond| Cond| H| H| Active| Reverse
Trd| Cond| L| L| Inactive| Stop
Trd| Cond| L| L| Active| Stop
Trd| Cond| L| H| Inactive| Hold
Trd| Cond| L| H| Active| Forward
Trd| Cond| H| L| Inactive| Stop
Trd| Cond| H| L| Active| Stop
Trd| Cond| H| H| Inactive| Stop
Trd| Cond| H| H| Active| Stop
Cond| Trd| L| L| Inactive| Stop
Cond| Trd| L| L| Active| Stop
Cond| Trd| L| H| Inactive| Stop
Cond| Trd| L| H| Active| Stop
Cond| Trd| H| L| Inactive| Stop
Cond| Trd| H| L| Active| Stop
Cond| Trd| H| H| Inactive| Hold
Cond| Trd| H| H| Active| Reverse

Manual Control Add-on Board

An optional manual control add-on board is available. This board allows the user to control the MDL-003 or other stepper motor without the use of an external control circuit. It provides controls for setting the scanning rate and for performing either continuous scanning or manual forward or reverse motion control.
Manual control board dimensions: 1 x 1.25 inches.

Figure 6 Driver board with manual control add-on board
To use the manual control add-on board, connect it to the main driver board’s control input connector, as shown in Figure 6. The power indicator LED should turn on if the power to the main board is connected. The controls are as follows:

Manual/auto switch: Selects between manual delay control and continuous scanning

• back and forth over the full range of the MDL.
• Switch position towards main board: auto scan
• Switch position towards push-buttons: manual control. In this position, the forward and reverse buttons can be used to change the delay setting.

Speed selection dial: This is a numbered dial that controls the frequency of the clock

pulse sent to the main driver board. Depending on the state of the step selection dip switch on the main board, the MDL motor will make one full, half, or quarter step per clock pulse.
Note: dial settings 8 and 9 are not used. If the dial is in either of these positions, the MDL will not respond to the forward or reverse buttons or the auto-scan setting.

Forward button: MDL moves in the direction of increasing delay, at a speed
determined by the speed selection dial and step mode settings, as long as the button is held down. When it reaches the maximum delay, it stops, and holding down the button has no further effect.

Reverse button: MDL moves in the direction of decreasing delay, at a speed
determined by the speed selection dial and step mode settings, as long as the button is held down. When it reaches the minimum delay, it stops, and holding down the button has no further effect.

Technical Support

General Photonics is committed to high quality standards and customer satisfaction. For any questions regarding the stepper motor control board, please contact us at (909)-590-5473 (telephone) or (909)-902-5536 (fax), or by e-mail at support@lunainc.com. We will respond to all customer questions within 24 hours during regular business hours. You can also contact us by mail at:
General Photonics
14351 Pipeline Avenue
Chino, California 91710
USA

References

• Luna Innovations | Fiber Optic Sensing and Measurement Systems

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