Asynchronous Pulse Frequency - Siemens SINAMICS S120 Function Manual

Vector control

4.26 Asynchronous pulse frequency

4.26 Asynchronous pulse frequency
The pulse frequency is coupled to the current controller cycle, and can only be adjusted in
multiple integer steps. For most standard applications, this setting makes sense and should
not be modified.
For certain applications, it may be advantageous if the pulse frequency is decoupled from
the current controller cycle. The consequences are:
● Motor Modules or Power Modules are optimized
● Certain motor types are operated with a more favorable pulse frequency
● Motor Modules of different sizes can be operated with different pulse frequencies
● Faster sampling times can be set for DCC and free function blocks
● Faster setpoint transfers from a higher-level control system are possible
● Automatic commissioning routines with different current controller cycles are simplified
This function is enabled for Motor Modules and Power Modules in the chassis format in
vector control.
Activating the function
To be able to activate the asynchronous pulse frequency, the following requirements must
be satisfied:
● r0192.16 = 1
● p1800 < 2 x 1000 / p0115[0]
● p1810.3 = 0
When the requirements are satisfied, the asynchronous pulse frequency (for vector control)
can be activated with the parameter setting p1810.12 = 1.
The activation has the following effects:
● Switchover of the gating unit (p1810 bit 2)
● Switch on of the actual current value correction (p1840 bit 0)
● Minimum pulse frequency 1000 * 0.5 / p0115[0]
● Maximum pulse frequency 1000 * 2 / p0115[0]
● Fluctuating dead times and dynamic response in the current control circuit
● Increased current ripple in the current display
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Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions