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GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 3 Paramters/Functions
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3-77
Internal Permissive Inputs
Variable Description
Local fault string
Local hardware permissive. When Local fault string is True,
it will prevent the drive from starting or running. If a run is
requested while Local fault string is True, a Trip fault, Local
flt, will be generated.
System fault
string
System hardware permissive. When System fault string is
True, it will prevent the drive from starting or running. If a run
is requested while System fault string is True a Trip fault,
System flt, will be generated. See also Hardware Fault
Strings.
Flux decay active
Indicates that that flux has not yet decayed below 2% of
100% Flux when the drive is in Tachless mode operation. If
True, Flux decay active will prevent the drive from starting.
An alarm, Run cmd w high flux, will be generated if this
permissive is True when a run is requested.
DC bus charged Indicates that the DC bus is charged. An alarm, DC bus
voltage low, is generated when this permissive is False.
Function outputs
Variable Description
Ready to run The main run permissive and primary indication that the drive
is ready to run. If False, this permissive will cause all run
requests and commands to drop out. The drive cannot be
started unless Ready to run is True.
Run ready and
fluxed
Indicates that the drive is fluxed and ready to run. This
permissive can be used in coordination with Full flux request
as a ready to run signal for applications that keep the drive
fluxed for fast restarts. Refer to Sequencer Commands.
Function configuration
Parameter Description
Bypass Q/C stop This parameter removes Coast stop active and Quick stop
active from the Ready to run permissive, when they are
normally included. Bypass Q/C stop should be set to Yes if
Normal stop mode is set to Quick stop or Coast stop. (Also
see Stopping Commands and Modes.)
Flying restart This parameter has the following possible values:
Enable fly restart: Allows the drive to restart while the motor
speed is above the Zero speed level.
Disable fly restart: The motor speed must be below the Zero
speed level before the drive can be restarted, otherwise a
trip fault, Flying restrt disabl, will be generated.
Locked shaft restart: The application assures that the shaft is
locked (by a brake or other means) when the drive is started.
This mode may decrease the time that it takes to pre-flux the
drive.
Note
In this mode, failure to insure that the shaft is locked
may cause the drive to misoperate
.