Difference between revisions of "Servo motor torque mode test"

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== Steps ==
 
== Steps ==
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{{machine|During this test, motor may spin at maximim speed. Ensure that motor is free to run, or if not, ensure that no damage occurs if it hits to mechanical limit.}}
 
# Set the drive in Torque mode from [[Granity | Granity]]/Goals tab.
 
# Set the drive in Torque mode from [[Granity | Granity]]/Goals tab.
 
# Go to Granity/Testing tab.
 
# Go to Granity/Testing tab.
 
# Make sure that the setpoint is zero and the drive is enabled and ready.
 
# Make sure that the setpoint is zero and the drive is enabled and ready.
−
# Set the [TSP1] Target setpoint 1 to 500.
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# Set the {{param|TSP1}} Target setpoint 1 to 500.
 
# Increase the target setpoint slowly by clicking the "Increment by TSP1" button and checking whether the motor moves of not.
 
# Increase the target setpoint slowly by clicking the "Increment by TSP1" button and checking whether the motor moves of not.
 +
#*When stepoint reaches 16384 or greater, the maximum current is being delivered to motor. So further increase of setpoint will not have any effect.
 +
#*If drive stops into overvelocity fault, it typically means that system works properly. However, you may increase {{param|FOV}} enough to complete the test without overvelocity fault.
 
# If the motor moves in a continuous manner, all parameters and wiring are correct.
 
# If the motor moves in a continuous manner, all parameters and wiring are correct.
 
#* If the motor halts, click the "Set zero setpoint" button and follow the troubleshooting instructions below.
 
#* If the motor halts, click the "Set zero setpoint" button and follow the troubleshooting instructions below.

Revision as of 14:33, 28 August 2017

Main idea

The servo motor torque mode test is a method to verify that basic parameters and wiring are correct. The target is to rotate/move the motor in torque mode in a continuous manner.

Assumptions

  • All wiring are triple checked and torque tuning is done properly.
    • Refer to the product user guidebook for detailed wiring instructions.
    • Pay special attention to encoder operating voltage (VCC) and GND wiring. Wiring VCC and GND erroneously may damage the encoder.
  • The motor is free to move/rotate, and no harm nor damages can happen from a long continuous movement.
  • You have read and understood servo tuning basics.


Don't use crossover cables in SimpleMotion V2 system

Steps

During this test, motor may spin at maximim speed. Ensure that motor is free to run, or if not, ensure that no damage occurs if it hits to mechanical limit.
  1. Set the drive in Torque mode from Granity/Goals tab.
  2. Go to Granity/Testing tab.
  3. Make sure that the setpoint is zero and the drive is enabled and ready.
  4. Set the Target setpoint 1TSP1 Target setpoint 1 to 500.
  5. Increase the target setpoint slowly by clicking the "Increment by TSP1" button and checking whether the motor moves of not.
    • When stepoint reaches 16384 or greater, the maximum current is being delivered to motor. So further increase of setpoint will not have any effect.
    • If drive stops into overvelocity fault, it typically means that system works properly. However, you may increase Over voltage fault thresholdFOV enough to complete the test without overvelocity fault.
  6. If the motor moves in a continuous manner, all parameters and wiring are correct.
    • If the motor halts, click the "Set zero setpoint" button and follow the troubleshooting instructions below.

Troubleshooting

In most cases, the motor halts after a short movement if the feedback resolution is incorrect, or if it's direction is reversed.

  • Check wiring, especially logic and motor voltages, Enable, and STO.
  • Check [FBI] Invert feedback direction checkbox in Granity/Machine tab, and repeat the steps above.
    • This inverts the encoder direction without the need for rewiring.
  • Check the motor pole count and encoder resolution from their datasheets.
  • Move the motor by known angle/distance, and check the position feedback reading from Granity/Testing tab.
    • The Position feedback value in Granity/Testing tab is always in CPR (counts per revolution). From this, the correct PPR can be calculated for one revolution (PPR = CPR/4).

Further reading

After the torque mode is configured and the motor can be controlled in torque mode properly, velocity and/or position modes can be tuned. Please refer to their respective instruction pages for further details.

Other motor types

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