Technical information

5 – PARAMETER DESCRIPTIONS
54
P16 Decel Begin Level CFN 15
LCD Display
CFN:Decel Begin
15 40 %
Range 1 % - 100% of phase angle firing (Default 40%)
Description Stop Mode set to Voltage Deceleration:
The voltage deceleration profile utilizes an open loop S-curve voltage ramp profile. When the Stop
Mode parameter is set to Voltage Decel, the Decel Begin Level parameter sets the initial or starting
voltage level when transferring from running to deceleration. The deceleration beginning level is not
a precise percentage of actual line voltage, but defines a point on the S-curve deceleration profile.
A typical voltage decel begin level setting is between 30% and 40%. If the motor initially surges
(oscillates) when a stop is commanded, decrease this parameter value. If there is a sudden drop in
motor speed when a stop is commanded, increase this parameter value.
Stop Mode set to TruTorque Deceleration:
Not used when the Stop Mode parameter is set to TruTorque Decel, the decel begin level has no
effect on the deceleration profile. The TruTorque beginning deceleration level is automatically
calculated based on the motor load at the time the stop command is given.
Note: It is important that the Rated Power Factor parameter is set properly so that the actual
deceleration torque levels are the levels desired.
See Also Stop Mode parameter on page 53
Decel End Level parameter on page 55
Decel Time parameter on page 56
Controlled Fault Stop Enable parameter on page 64
Rated Power Factor parameter on page 82
Theory of Operation section 8.4, Deceleration Control, on page 127