gefran BUy-1020 Manuel D'utilisation page 62

6) Select a resistor value desired in the range between the answers found in steps 4) and
5).
Seleting closer to the value in step 5) may cause your resistor to be higher power rating
to support the:
Instantaneous Current =
selecting closer to the value found in step 4) doesnt leave room for field adjustement
of faster stop times later.
7) Use the final resistance value, determined in step 6), to check the resistor peak current
and BU peak current needed.
this determines quantity of braking units needed, and which type of BU based on the
peak amps needed.
8)
For an occasional stop, for example, once every 10 minutes, or stop then cool to ambient,
then the resistor can be selected on its short time rating, for example a 15 sec rating or
30 sec rating average stopping kW if the resistor rating is in kW.
or:
Average Stopping kW
The resistor power rating must meet both instantaneous and short time ratings.
For overhauling loads, or more frequent stopping cycles, use the previous detailed
calculations.
DC Link Volts
DB Resistance Ohms
Resistor Ohm
—————— Braking Unit ——————
DC Bus Volts
Current Limit Ohms
= Peak Current [Amps]
= Short Time Current [Amps]
62-GB