GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 3 Paramters/Functions
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Function description
The Local Speed Reference fu nction is part of th e Speed Reference Generation
function. It forms a speed reference signal from the local source (the DDI).
The Local Speed Reference fun ction produces a local speed refer ence. This becomes
the speed reference used by the Speed Reference Generation function if the drive is
in local mode (when Local mode active is True). Local mode is enabled using the
DDI Remote/Local button.
The local speed referen ce is formed by adjusting the refer ence around an initial
value. The initial value is specified by Local speed. To make the adjustment, press
the DDI speed incremen t (Speed +) and decrement (Speed –) bu ttons. Using the
increment and decr ement buttons set s Local inc command and Local dec command
respectively. The sp eed reference increases when Local inc command is True and
decreases when Local dec command is True. The rate of change is defined by Local
Inc/Dec rate. The local speed reference is limited to values between zero an d
Applied top RPM.
The calculation of the loca l speed reference described in the preceding paragraph
applies when Jog request is False. When Jog request is True, the local speed
reference is set to the value of Local jog speed. More information on Jog request is
available in the Sequencer Commands function help.
Related diagrams
• Speed Reference Gener ation (Ovr_RfSel)
Minimum Speed Lim it
The Minimum Speed Limit function proh ibits the speed reference from falling below
a specified magnitud e.
Function inputs
The following table specifies the input variables of the Minimum Speed Limit
function.
Variable Description
Minimum speed
input
Speed reference which is the possibly reversed local or
remote speed reference (variable Speed reference). RPM
Function outputs
The following table specifies the output variables of the Minimum Speed Limit
function.
Variable Description
Minimum speed
output
Speed reference whose magnitude has been clamped to a
minimum value and which is the input to the Critical Speed
Avoidance function (var iable Speed avd func input). RPM
Function configuration
The following table specifies the configuration parameters of the Minimum Speed
Limit function.
Parameter Description
Minimum speed Minimum speed reference magnitude. RPM