Lenze 8615E - Manual (Page 40)

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If the above conditions do not apply, you can determine the
suitable brake resistor as follows:
1. Determine the resistance:
[ ]
[ ]
[ ]
W power brake peak required
V 765
Resistance
2 2
≤ Ω
Depending on the unit the resistances must not fall below the
following values:
Inverter type 8601 8602 8603 8604 8605 8606 8607
minimum resistance 180
Ω
180
Ω
180
Ω
180
Ω
180
Ω
100
Ω
100
Ω
Inverter type 8608 8609 8610 8611 8612 8613 8614 8615
minimum resistance 33 Ω 33 Ω 33 Ω 33 Ω 15 Ω 15 Ω 15 Ω 15 Ω
2. Determine the rated power of the brake resistor:
Rated power W
duty time
cycle time
765 [V ]
resistance
2 2
≥ ⋅
Ω
The permissible continuous power of the internal brake chopper
does not restrict the unit. It corresponds to the max. permissible
brake power.
3. Determine the thermal capacitance of the resistor:
Thermal capacitance
765 V
Resistance
max. brake time s
2 2
kWs
≥
Ω