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Unidrive SP Regen Installation Guide 149
Issue Number: 2 www.controltechniques.com
For SP1xxx and SP2xxx drives the default value is a suitable value for standard braking resistors that can be mounted within the drive heatsink as
given in the table below. For larger drives the default is 0.00.
This parameter defines the time period that the braking resistor fitted can stand full braking volts without damage. The setting of this parameter is
used in determining the braking overload time.
This parameter defines the time period which must elapse between consecutive braking periods of maximum braking power as defined by Pr 10.30.
The setting of this parameter is used in determining the thermal time constant of the resistor fitted. It is assumed that the temperature will fall by 99%
in this time, and so the time constant is Pr 10.30 / 5. If either Pr 10.30 or Pr 10.31 are set to 0 then no braking resistor protection is implemented.
The braking resistor temperature is modelled by the drive as shown below. The temperature rises in proportion to the power flowing into the resistor
and falls in proportion to the difference between the resistor temperature and ambient.
10.30 Full power braking time
Drive modes Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
2 111
Range Regen 0.00 to 400.00 s
Default Regen See below
Update rate Background read
Drive voltage rating Parameter default
200V 0.09s
400V 0.02s
575V and 690V 0.01s
Drive voltage rating Full braking volts
200V 390V
400V 780V
575V 930V
690V 1120V
10.31 Full power braking period
Drive modes Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111
Range Regen 0.0 to 1500.0 s
Default Regen
SP1xxx and SP2xxx: 2.0s
Larger drive sizes: 0.0s
Update rate Background read
0
100
%
t
Pr
10.30
Pr
10.31
verload
accumulator
Pr
10.39
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