Wiring instructions

The MASSO Closed Loop Stepper Motors require the following signals:

• STEP and DIRECTION (Differential signals)
  Provided directly by the MASSO G3 controller on all 5 axis outputs
• Cable distance
  Up to 50 metres between MASSO and the motor when using high-quality twisted pair cable with uniform impedance and low attenuation
• Enable signal
  A 5V to 24V signal is required to enable the motor
  This can be supplied using a relay
• Alarm signal
  The motor provides an alarm output to notify MASSO of a fault condition
  • A 10K pull-up resistor must be installed
  • Input must not be inverted
  • Should show Low when there is no alarm
  • Each motor requires its own alarm input and resistor
• Power supply
  • 24VDC to 36VDC
• Current requirements
  • 2Nm model: up to 3.5 Amps
  • 3Nm model: up to 4 Amps

Power

The motor drive requires a 24V to 36V DC power supply.

• The minimum conductor size is 0.75mm².
• The connector will accept up to 1.5mm² wire.
• The 2Nm model can draw up to 3.5 Amps.
• The 3Nm model can draw up to 4 Amps.

Accessing the Cable Connections

Remove the marked rear screws to open the cable cover.

Connecting the Motor Enable

A 5V to 24V signal is required to enable the motor. This is typically supplied via an Estop relay so that the signal is removed when the Estop button is pressed.

It is recommended that this signal is supplied through a resistor to limit fault current in case it comes into contact with ground. A 2.7K 1/4 watt resistor is suitable for this purpose.

If the Enable signal does not operate correctly, check that the MASSO and motor power supplies share a common ground.

Setting Up Motor Resolution

The motor uses a built-in optical encoder to track position.

• Resolution is set using DIP switches 1 to 4.

Status LED and Alarms

The motor provides visual status indicators:

• The green LED indicates that the motor is powered.
• The red LED indicates that the motor is in an alarm state.

Alarm Causes

Alarms can be caused by any of the following:

• The enable signal of 5V to 24V is not received by the motor
• The motor receives STEP signals with acceleration or top RPM higher than it can support
• The applied power is outside the motor specifications
• The available current is insufficient for the load
• The motor cannot complete the requested movement due to mechanical issues such as an obstruction or axis jam

The motor alarm input must not be inverted on MASSO.

For additional trouble shooting of the MASSO Closed loop stepper motor please see: HERE

Alarm on Motor Power-Up

If the motor moves during power-up, it may cause an alarm. In this condition, the red alarm light flashes five times at 0.8 second intervals and then repeats after 2 seconds.

If this occurs, the motor must 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 clear this alarm state.

This is most likely to occur when the motor is used on the Z axis and the axis drops during the power-up sequence.

It is recommended that the Estop button is released before powering up the machine.

Torque Information

Stepper motors provide high torque at low RPM. As RPM increases, the available torque reduces.

The graphs below can be used for machine feed rate and torque calculations.

Model: HT-SCL-2NM

Maximum torque: 2 N·m

Model: HT-SCL-3NM

Maximum torque: 3 N·m

Mechanical Data

Model: HT-SCL-2NM

Model: HT-SCL-3NM

Model: Closed Loop Stepper Motor With Brake – 3NM