Emerson Unidrive M702 - Braking Resistor Overload Protection Parameter Settings; Heatsink Mounted Braking Resistor Data

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66 Unidrive M702 User Guide
Issue Number: 3
Table 4-18 Heatsink mounted braking resistor data
* To keep the temperature of the resistor below 70 °C (158 °F) in a 30 °C (86 °F) ambient, the average power rating is 50 W for size 3, 100 W for size
4 and 5. The above parameter settings ensure this is the case.
Braking resistor overload protection parameter settings
Failure to observe the following information may damage the resistor.
The drive software contains an overload protection function for a braking resistor. On size 3, 4 and 5 this function is enabled at default
to protect the heatsink mounted resistor. Below are the parameter settings.
For more information on the braking resistor software overload protection, see Pr 10.030, Pr 10.031 and Pr 10.061 full descriptions in
the Parameter Reference Guide.
If the resistor is to be used at more than half of its average power rating, the drive cooling fan must be set to full speed by setting
Pr 06.045 to 11.
CAUTION
Parameter
Size 3 Size 4 Size 5
200 V
drive
400 V
drive
200 V
drive
400 V
drive
200 V
drive
400 V
drive
575 V
drive
Braking resistor rated
power
Pr 10.030 50 W 100 W 100 W
Braking resistor thermal
time constant
Pr 10.031 3.3 s 2.0 s 2.0 s
Braking resistor
resistance
Pr 10.061 75 Ω 38 Ω 38 Ω
Parameter Size 3 Size 4 Size 5
Part number 1220-2752-00 1299-0003-00
DC resistance at 25 °C 75 Ω 37.5 Ω
Peak instantaneous power over 1 ms at nominal
resistance
8 kW 16 kW
Average power over 60 s * 50 W 100 W
Ingress Protection (IP) rating IP54
Maximum altitude 2000 m