Pre-Torque Timer Ramp Up; Pre-Torque Timer Ramp Down - KEB COMBIVERT F5 Instruction Manual

Advanced Parameters
US. 17
The function of this parameter is dependent on which mode of pre-torque is selected
in LF.30.
Pre-torque
LF.30 = 3 analog pre-torque from load weigher
timer ramp up
This timer controls the build time for the Pre-torque function. Once the direction input
is activated this timer begins counting. In the mean time the current check takes
place and then finally the motor is magnetized. At this point the analog pre-torque
value is evaluated and the torque begins to build on the motor. If this value is set
too short the torque build will stop before the current check is done or before it has
reached its nominal value. As a result it will appear that the Pre-torque function
does not work. If the value is too long the actual pre-torque made by the motor will
appear to over compensate.
LF.30 = 5 Synthesized pre-torque
This timer inserts dead time prior to brake release during which the current check
function occurs and the motor becomes magnetized. In this case it should always
be adjusted less than the actual mechanical brake pick time.
US. 18
The function of this parameter is dependent on which mode of pre-torque is selected
in LF.30.
Pre-torque
LF.30 = 3 analog pre-torque from load weigher
timer ramp
This timer controls the ramp down time for the analog pre-torque function. Once
down
the pre-torque is established it is necessary to ramp the command torque down
to provide a smooth transition when the brake releases. Without any ramp, the
turn off of pre-torque will be abrupt and with too much ramp time the actual start of
movement will be influenced.
LF.30 = 5 Synthesized pre-torque
This timer controls the window during which the synthesized pre-torque function
is actually active. The mechanical release of the brake must take place during
this time period.
132
Unit: 0.1 seconds
Value range: 0.0...10.0
Default setting: 0.3
Adjustment values: (when LF.30 = 3) 0.3 to 0.5 sec
(when LF.30 = 5) 1/2 of the total speed pick delay
time but less than the mechanical brake pick time
Unit: 0.1 seconds
Value range: 0.0...10.0
Default setting: 0.1
Adjustment values: (when LF.30 = 3) 0.1 to 0.2
(when LF.30 = 5) 0.1 to 0.2