Menu 2
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40 Digitax ST Advanced User Guide
www.controltechniques.com Issue Number: 1
The jog deceleration rate is only used when the drive is changing speed because the jog reference has changed or to stop from the jog reference. It
is not used to go from the jog to the run state. This prevents the fast ramps normally used with jog from being used when changing between running
and jogging.
These bits are provided for control by logic input terminals for external ramp selection (see Pr 2.10 and Pr 2.20).
The motor and load inertia (Pr 3.18), motor torque per amp (Pr 5.32) and the rate of change of the ramp output (Pr 2.01) are used to produce a torque
feed forward value that should accelerate or decelerate the load at the required rate. This value can be used as a feed forward term that is added to
the speed controller output if Pr 4.22 is set to one. Pr 2.38 shows the torque value as a percentage of rated active current.
2.29 Jog deceleration rate
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
3111
Range
0.000 to 3,200.000 s/1000rpm
Default
0.000
Update rate Background read
2.32 Acceleration select bit 0
2.33 Acceleration select bit 1
2.34 Acceleration select bit 2
2.35 Deceleration select bit 0
2.36 Deceleration select bit 1
2.37 Deceleration select bit 2
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Update rate 4ms read
2.38 Inertia compensation torque
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Range ±1,000.0 %
Update rate 4ms write
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