AMCI SMD34E2 Mode d’emploi

20 Gear Drive, Plymouth Industrial Park, Terryville, CT 06786 page: 1

Tel: (860) 585-1254 Fax: (860) 584-1973 Web: www.amci.com

Frequently Asked Questions

FAQ: SMD34E2 Removing Main Power

The AMCI SMD34E2 integrated stepper motor driver has Main and Auxiliary terminals on its power

connector. The Main supplies power to both the motor and to the electronics while the optional

Auxiliary supplies power only to the electronics, including the network connection and the encoder.

It is a common practice to connect power to both the Main and Auxiliary Power pins and to remove

the Main Power as part of a safety system. The Auxiliary Power maintains the network connection

while the Main Power is removed.

Removing the Main Power will cause the following to occur.

•The Driver Fault Status bit will be set

•The Position Invalid Status bit will be set

•The Driver Enabled Status bit will be reset

The following three rungs show the action that you should take while the Main Power is removed and

the steps needed to recover after the Main Power has been restored.

While the Main Power is removed, write a word of 0 to Output Word 0, which is also called

Command Word 0. This will prepare the SMD34E2 to accept the next command after the

Main Power has been restored.

After the Main Power has been restored, and if there is a Driver Fault, send the Reset Error

command to the SMD34E2.

This command will also enable the driver causing it to send power to the motor.

20 Gear Drive, Plymouth Industrial Park, Terryville, CT 06786 page: 2

Tel: (860) 585-1254 Fax: (860) 584-1973 Web: www.amci.com

Frequently Asked Questions

Removing the Main Power also causes the Position Invalid Status bit to become set. This

status Bit must be reset before you can perform Absolute Moves, or you can ignore this

status bit if you are performing any other type of move.

The following rung Presets the current motor position to the value in the AOI’s Target

Position field, and also resets the Position Invalid status bit.

The Preset_Motor_to_Encoder, the CW_Home, or the CCW_Home commands can be used

in place of the Preset_Position AOI shown here to reset the Position Invalid Status bit.

Common Issues

•Sending the Disable_Driver command to the SMD34E2 at the same time the main power is

removed.

This will cause the SMD34E2 to not detect that the main power has been removed, leading to

the status bits not correctly changing state, and finally to the above logic not functioning

correctly.

•Sending the Reset_Error command before the Main Power has been restored.

The SMD34E2 only acts on the 0 to 1 transition of the command bit and sending the reset

error command before the main power has been restored will cause the unit to ignore the reset

error command.

File: FAQ_SMD34E2_removing_main_power.doc

Date: 10/28/2019

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