Lenze 8603 E.6x.6 Series - 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:
[]
[
]
[] Wpower brakepeak required
V 765
Resistance
22
≤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 180Ω 180Ω 180Ω 180Ω 180Ω 100Ω 100Ω
Inverter type 8608 8609 8610 8611 8612 8613 8614 8615
minimum resistance 33Ω 33Ω 33Ω 33Ω 15Ω 15Ω 15Ω 15Ω
2. Determine the rated power of the brake resistor:
Rated power W
duty time
cycle time
765
[V ]
resistance
22
≥⋅
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
22
kWs ≥
Ω