Motor not moving troubleshooting

This article lists common reasons for motor not producing desired motion when using GD motor drives.

The suggested actions are described for drives supporting Granity software. Hoever similar instructions apply to older GDtool based drives too.

List of reasons

Fault state going active

Drive suspends all motor control until fault is cleared. If fault occurs again, check parameterization of drive or try adjusting fault tolerance limits to higher. If no stability can be achieved, pay attention to correctness of motor parameters MPC, FBR, FBI and FBH. In many cases counting direction of encoder is opposite of assumed, so inverting FBI setting may be needed. All of these settings safe to experiment if motor is shaft unmounted.

Incorrect motor settings

Double check all motor parameters especially on Machine tab of Granity. Also see the previous paragraph ↑↑.

No setpoint signal

Try moving motor by giving commands Granity's Set Abs and Set Inc buttons.

Output current is insufficient to overcome load friction or weight

Try increasing motor current limits or try motor without any load

No current flow on motor

Verify that current really flows through motor by doing response tests at Granity Testing page. Tick Torque setpoint & achieved signals to see the target current and actual current of motor. Both curves should stay together. If Torque achieved lags behind, it is sign of insuffucient supply voltage to overcome motor coil resistance or EMF. One possibility is also activation of STO that forces drive power stage off.

Motor initialization has failed

If Hall sensonrs (FBH) are not used, then drive may fail to initialize motor properly under significant mechanical load or due to weight of vertical axis. Try increasing current limits or connecting Hall sensors (if motor is equipped with them).

In no event the Product Information or parts hereof shall be regarded as guarantee of conditions or characteristics. The Product Information or any part thereof may also not be regarded as a warranty of any kind. No liability of any kind shall be assumed by Author with respect to Product Information or any use made by you thereof, nor shall Author indemnify you against or be liable for any third party claims with respect to such information or any use thereof.

As content of this Wiki may be edited by user community, Granite Devices Oy or it's affiliates do not take any responsibility of the contents of this Wiki. Use information at your own risk. However, Granite Devices staff attempts to review all changes made to this Wiki and keep information trustworthy.

Without written consent, Granite Devices' Products or Intellectual Property shall not be used in situations or installations where living beings, material property, or immaterial property could be harmed by the operation, features or failures of Product. Products may only be used in a way where hazards like moving parts, electric shock, laser radiation, or fire can't be realized even if the content of this Wiki would suggest otherwise.