Activating Stepper Motor Diagnostics - Siemens SIMATIC FM 353 Manual

7.3.6

Activating stepper motor diagnostics

Overview
Once optimization of stepper motor control is completed, activate the stepper mo-
tor diagnostics as needed.
Boost
The boost signal is monitored in terms of its active time. This is in order to protect
the drive motor against overheating.
Refer to the stepper motor drive documentation for information regarding maximum
absolute and relative boost duration. Enter this information into machine data
MD48 and MD49, provided for that purpose.
When boost function is parameterized, the FM 353 triggers the errors "Boost dura-
tion absolute" or "Boost duration relative" in the event that time for the active
phase(s) of the Boost signal is exceeded.
Once parameterization is completed, check the diagnostics function for efficacy
using a suitable test program with which particularly large proportions of accelera-
tion and braking phases occur during execution.
Rotation monitoring
Activation is accomplished by way of the "Rotation monitoring" single-setting func-
tion (refer to Section 9.7.3 for functional description of rotation monitoring).
If the rotation monitoring function is programmed, the FM 353 will trigger the "Rota-
tion monitoring" error in the event that the stepper motor is unable to follow the
movement specified.
Check the efficacy of the diagnostics function. This is accomplished by electrically
separating the cyclic zero pulse encoder or the power section of the stepper motor
and executing a test movement in any operating mode.
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Starting up
7-25