Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018 413
extended speed range of a PM motor is not permitted, this value can be used to
limit motor speed to protect the drive from damage caused from bus overvoltage
conditions that occur when disabling a PM motor at high speed.
When configured for Position Loop or Velocity Loop operation, this bus
overvoltage protection includes limiting the magnitude of the velocity reference
value allowed into the velocity summing junction to the Bus Overvoltage Speed
Limit value using the velocity limiter function. If the signal entering the velocity
limiter exceeds this velocity limit value, and the PM Motor Extended Speed
Permissive is False, the velocity limiter clamps the velocity reference to this value
and sets the Velocity Limit status bit. If the PM Motor Extended Speed Permissive
is True, or the value of this attribute is 0, this limit is not applied.
When the extended speed range of a PM motor is not permitted, overvoltage
protection is also provided through motor overspeed detection based on the
Motor Overspeed Factory Limit and Motor Overspeed User Limit. Exceeding
these limits results in a Motor Overspeed FL or UL Axis Exception. Overspeed
detection is the only source of protection when the axis is configured for Torque
Loop operation.
PM Motor Rotary Max Extended Speed
Usage Access Data Type Default Min Max Semantics of Values
Optional - PVT
PM only
Set/SSV REAL 0
FD
0
or
Rotary Motor
Max Speed
RPM
When the extended speed range of a PM motor is permitted (PM Motor Extended
Speed Permissive is True), this value can be used to limit the speed of a rotary
motor to protect the motor or load from damage due to an overspeed condition.
When configured for Position Loop or Velocity Loop operation, this overspeed
protection includes limiting the magnitude of the velocity reference value allowed
into the velocity summing junction using the velocity limiter function. If the
signal entering the velocity limiter exceeds this velocity limit value, the velocity
limiter clamps the velocity reference to this value and sets the Velocity Limit status
bit. If the value of this attribute is 0, this limit is not applied.
When the extended speed range of a PM motor is permitted, overspeed protection
is also provided through motor overspeed detection based on the Motor
Overspeed Factory Limit and Motor Overspeed User Limit. Exceeding these
limits results in a Motor Overspeed FL or UL Axis Exception. Overspeed
detection is the only source of protection when the axis is configured for Torque
Loop operation.
If the related optional attribute, Rotary or Linear Motor Max Speed, is supported,
software will apply this maximum speed value as the Max Value for this attribute.
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