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GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 3 Paramters/Functions
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3-19
Control Diagnostic Variables
The Control Diagnostic Variables function outputs filtered diagnostic variables that
are available to the user.
Function outputs
The following table specifies the output variables of the Control Diagnostic
Variables function.
Variable Description
AC line voltage mag
Filtered ac line magnitude. A true magnitude calculation
of Vab and Vbc which is then filtered.
AC line frequency Filtered ac line frequency produced by the phase lock
loop.
Line Simulator
The Line Simulator function allows the user to simulate the operation of the drive
and the ac line without applying power to the bridge.
Function inputs
The following table specifies the input parameters of the Line Simulator function.
Parameter Description
Sim line frequency
AC line frequency in simulator mode. It is normally set
to, but not restricted to, 50 or 60 Hertz.
Sim freq slew rate
Simulator frequency slew in radians/sec/sec. Setting
this value to a something other than zero causes the
frequency to slew continuously from (-)0.5 of nominal to
(+)0.25 of nominal and back. This exercises the entire
transient frequency range covered by the specification.
Sim A-N volt scale Sim A-N volt scale can be used to attenuate phase A
line to neutral voltage in order to simulate transient line
conditions. The line to neutral voltage for phase A will
be attenuated according to Sim A-N volt scale every
2.70046 Seconds. The duration of the transient is
specified by the parameter Volt short time. The 2.70046
Seconds period was chosen so that the transient
condition gradually walks through the sine wave. In
order to simulate an open on phase A, set Sim A-N volt
scale to 1.0, Sim B-N volt scale to 1.0, and Sim C-N volt
scale to 0.5.
Sim B-N volt scale
Sim B-N volt scale behaves identically to Sim A-N volt
scale except that it affects phase B instead of phase A.
Sim C-N volt scale Sim C-N volt scale behaves identically to Sim A-N volt
scale except that it affects phase C instead of phase A.
A-B volt fault scale A-B volt fault scale simulates a line to line fault
between phases A and B. The default for A-B volt fault
scale is 0, providing no attenuation.