BENSHAW RediStart EXEXMVRMX3 Series, User Manual

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7.4.2 TruTorque Deceleration
Overview TruTorque deceleration control is a closed loop deceleration control. This allows TruTorque deceleration to
be more consistent in cases of changing line voltage levels and varying motor load conditions. TruTorque
deceleration is best suited to pumping and compressor applications where pressure surges, such as water
hammer, must be eliminated. The MX
3
linearly reduces the motor's torque to smoothly decelerate the motor
and load. TruTorque deceleration is very easy to use with only two parameters to set.
Ending Level
The Decel End Level parameter sets the ending torque level for the TruTorque deceleration ramp profile.
A typical TruTorque decel end level setting is between 10% and 20%. If the motor stops rotating before the
deceleration time has expired, increase this parameter value. If the motor is still rotating when the
deceleration time has expired, decrease this parameter value.
Decel Time The decel time sets the ramp time between the motor torque level when stop was commanded and the decel
end torque level.
If the motor stops rotating before the decel time has expired, decrease the decel time parameter. If the motor
is still rotating when the decel time expires, increase the decel time parameter.
132
7 - THEORY OF OPERATION
Motor
Torque
Time
Decel Time
End Torque
Level
Stop command
Motor Torque
Before Stop
Command
Figure 39: TruTorque Deceleration