AKD BASIC User Guide | 6 AKD BASIC Parameters, Operators, Statements
6.28.3 REGEN.TEXT
General Information
Type R/W Parameter
Description
Sets the external regen resistor thermal protection time con-
stant.
Units s
Range 0.1 to 1,200 s
Default
Value
100 s
Data Type Float
See Also REGEN.WATTEXT , REGEN.REXT
Start Version M_01-00-00-000
Fieldbus Index/Subindex Object Start Version
EtherCAT COE and CAN-
open
3415h/0
M_01-00-00-000
Fieldbus Index/Subindex Is 64 bit? Attributes Signed? Object Start Version
Modbus 740 No 32 bit No M_01-03-00-000
Description
REGEN.TEXT is a thermal time constant used to protect an external regeneration (regen)
resistor from overheating and failing. Its value is the time-to-fault when input power steps from
0 to 150% of REGEN.WATTEXT . The drive's regen resistor protection algorithm continuously
calculates the power dissipated in the resistor and processes that power value through a single
pole low pass filter to model the regen resistor's thermal inertia. When the filtered regen power
on the output of the filter exceeds REGEN.WATTEXT, a fault occurs. REGEN.TEXT sets the
time constant of this thermal inertia filter.
REGEN.TEXT can often be found directly on power resistor data sheets. On the data sheets,
find the peak overload curve and then find the safe allowed time to be at 150% of the regen
resistor's continuous power rating. Another way regen resistor peak overload capability is often
specified is by giving the energy rating in joules of the resistor. If you have the energy rating E
then:
REGEN.TEXT = (1.1)*((joule limit)/REGEN.WATTEXT)
Example
The external regen resistor is rated for 250 W continuous, is 33 ohm, and has a joule rating of
500 joules. To use this resistor, the drive settings become:
REGEN.TYPE = -1 (External Regen)
REGEN.REXT = 33
REGEN.WATTEXT = 250
REGEN.TEXT = (1.1)*(500 j)/(250 W) = 2.2 sec
Kollmorgenâ„¢ | March 30, 2012 420
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