The MASSO Closed Loop Steppers require the following signals:
Differential output signals for STEP and DIRECTION - These signals are directly provided by the MASSO G3 controller on all 5 axis outputs.
Up to 50m between MASSO and the MASSO closed loops stepper motor can be achieved when using a high quality twisted pair cable with uniform impedance and low attenuation.
Enable signal - A 5v to 24v signal is required to enable the motors, this signal can be provided by a relay.
Alarm signal - An alarm signal output is provided by the motor to notify the controller if the motor is in an alarm state. Ensure you install the 10K pull up resistor as shown below. This input should not be inverted and should show Low when there is no alarm on MASSO. Each motor requires it's own alarm input and each alarm input requires it's own resistor.
Power - 24VDC to 36VDC.
Current - 2Nm model can draw up to 3.5 Amps.
Current - 3Nm model can draw up to 4 Amps.
INFORMATION: Use Shielded twisted pairs between MASSO and the Motor for the Step and direction differential signals. This will provide the greatest noise immunity. Ensure that the shield is connected to the ground at the MASSO end only. Do not ground the shield at both ends or you will create a ground loop. AWG 24 (0.2mm²) to AWG 22 (0.3mm²) is suitable for the signal wires. Ensure the wires are multi-stranded and twisted.
Power
The MASSO closed loop stepper motor drive is powered by a 24 to 36 volts DC power supply.
The power connector requires a minimum conductor size of 0.75mm². The power connector terminal will accept a wire up to 1.5mm².
2Nm model can draw up to 3.5 Amps.
3Nm model can draw up to 4 Amps.
Information: The -ve of the MASSO Power supply and the -ve of the Motor power supply must be connected together to form a common ground or the Enable and Alarm signals will not work correctly. Connect the power supply negatives at the main power distribution point. Do not use the Black GND terminals on MASSO for this purpose.
CAUTION: Observe the correct polarity when connecting the power to the MASSO closed loop stepper motor. Incorrect polarity will damage the drive.
Open the marked rear screws to open cable cover
Connecting the Motor Enable
To enable the stepper motor a 5 to 24-volt signal is required.
Normally this would be provided through an Estop relay which would disconnect the signal when the Estop button is pressed.
It is suggested that this voltage be supplied via a resistor of suitable value as it is only a logic level signal and the resistor will limit fault current in case it accidentally comes into contact with the ground. A 2.7K 1/4 watt resistor is a good choice for this task.
If the Enable signal does not work check that the Motor power supply and the MASSO power supply share a common ground.
Setting Up Motor Resolution
The MASSO closed loop stepper motor uses a built in optical encoder to track position.
Resolution is set using dip switches 1 to 4 on the motor.
WARNING: Only change the switch settings when the motor is powered off.
CAUTION:Switch 5 selects between leading and trail edge trigger, please set to the OFF position. Setting the activation edge of the input signal, “off” means the activation edge is the rising edge, while “on” is the falling edge.
INFORMATION: Use Switch 6 or settings in the MASSO F1 screen to invert motor rotation direction.
Status LED & Alarms
The motors provide two visual indications of motor status.
A Green LED indicates that the motor is powered.
A Red LED indicates that the motor is in an alarm state.
Alarms can be caused by any of the below reasons:
The enable signal of 5v to 24v is not received by the motor.
The motor received STEP signals that have acceleration or top RPM higher than the motor can support. This will also be affected by how much load is on the motor.
The power applied to the motor is less or more than the motor's specifications.
The current required to work under load is not enough.
The motor is not able to complete the requested rotation due to external mechanical issues such as the machine axis hitting something or getting stuck.
Do not invert the Alarm input in MASSO
For additional trouble shooting of the MASSO Closed loop stepper motor please see >>>HERE<<<
Alarm on Motor Power up
If during power up the motor moves it may cause a motor alarm where the The red Alarm light flashes five times at 0.8 second intervals and then repeats after 2 seconds
If this happens the motor needs to be repowered to resume normal operation by turning the machine off and back on or by power cycling the motor separately.
Cycling the Estop in this situation may cause the motor to rotate and alarm again. Only power cycling the motor will remove the alarm once in this state.
This is most likely to happen when the motor is used on the Z axis and the axis falls during the power up sequence.
It is advisable to release the Estop button before powering up the machine.
Torque Information
Stepper motors provide high torque at low RPMs but as the RPM increases the available torque reduces. The below graphs can be used for machine feed rate and torque calculations.