BENSHAW ENHANCED KEYPAD Informations techniques télécharger pdf (Page 134)

8 – THEORY OF OPERATION

Deceleration Control

128

8.4.2 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 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.

Figure 24 – TruTorque Deceleration

Motor

Torque

Time

Decel Time

End Torque

Level

Stop command

Motor Torque

Before Stop

Command

Beginning Level TruTorque deceleration control automatically calculates the motor loading when the stop command

was given and uses this value as the beginning level for the TruTorque deceleration ramp. Therefore

there is no parameter to set and the calculated beginning torque value provides a very smooth

transition from running to deceleration.

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.

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BENSHAW ENHANCED KEYPAD Informations techniques Page 134