Application Notes C-7
Speed Monitoring / Speed Band Limit
This routine is intended to fault the drive if the difference between the
speed reference and the encoder feedback is larger than the value set in
[Spd Dev Band], parameter 602 and the drive is NOT making any
progress toward the reference. [SpdBand Integrat], parameter 603 sets
the time that the speed difference can be greater than the deviation band
before causing a fault and setting the brake.
Float
Float is defined as the condition when the drive is holding the load at
zero hertz while holding off the mechanical brake. The float condition
starts when the frequency drops below the speed set in [Float Tolerance],
parameter 606. Float will stay active for a period of time set by
[ZeroSpdFloatTime], parameter 605. If a digital input (parameters
361-366) is set to “Micro Pos” (also Float) and it is closed, the Float
condition will stay active and will disregard the timer. This signal is also
available through a communication device, see [TorqProve Setup],
parameter 601.
Micro Position
Micro Position refers to rescaling of the commanded frequency by a
percentage entered in [MicroPos Scale %], parameter 611. This allows
for slower operation of a lift which provides an operator with better
resolution when positioning a load. Micro Position is activated only
when the drive is running at or near zero speed. This can be initiated by a
digital input configured as Micro Pos or through a communication
device ([TorqProve Setup]) which is the same digital input which signals
the float condition.
Fast Stop
Fast Stop is intended to stop the load as fast as possible then set the
mechanical brake. The Fast Stop can be initiated from a digital input or
through a communication device through [TorqProve Setup]. The
difference from a normal stop is that the decel time is forced to be 0.1
seconds. When the Torque Proving function is enabled, the Float time is
ignored at the end of the ramp. This feature can be used without enabling
the Torque Proving function.
Refer to Reverse Speed Limit
on page C-16
Minimum Speed
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