8 Basic drive functions (MCK)
8.4 Basic settings
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Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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Behaviour when the "setpoint holdback" function is parameterised online
The setpoint holdback can also be set "online", i.e. without inhibiting the inverter before. This
provides for an adjustment during commissioning while the setpoint generation is running, similar
to the setting of the gain of the speed or position controller.
Example: Runtime behaviour without and with setpoint holdback
Example 1 shows the behaviour without setpoint holdback. Due to the runtimes, there is an offset
between master and slave of 2 ms.
[8-22] Example 1: Runtime behaviour without setpoint holdback
Stop!
The setting while the setpoint generation is running causes a system-dependent time
change of the setpoint processing so that e.g. considerable step-changes or setpoint
holding processes occur.
In order to prevent setpoint step-changes which have a negative effect on the
mechanics:
• Always change the setting of the setpoint holdback in 1-ms steps only.
• Make the online parameterisation at low speeds only.
Setpoint at the output of the Motion Control Kernel (is transferred to the slaves via fieldbus)
Effective setpoint of the motor control in the master
Effective setpoint of the motor control in the slave
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