Unidrive M/HS Frame 5 to 6 Power Installation Guide 61
Issue Number: 9
Safety information Product information Mechanical installation
Electrical installation
Technical data UL listing information
Table 4-5 shows the default DC voltage level at which the drive turns on the braking transistor.
However the braking resistor turn on and the turn off voltages are programmable with Braking IGBT
Lower Threshold (06.073) and Braking IGBT Upper Threshold (06.074).
Table 4-5 Default braking transistor turn on voltage
4.10.1 Heatsink mounted braking resistor
A resistor has been especially designed to be mounted within the heatsink of the drive (size 5 only).
See section 3.10 Internal braking resistor on page 41 for mounting details. The design of the resistor
is such that no thermal protection circuit is required, as the device will fail safely under fault
conditions. On size 5 the in built software overload protection is set-up at default for the designated
heatsink mounted resistor. The heatsink mounted resistor is not supplied with the drive and can be
purchased separately.
Table 4-6 provides the resistor data for each drive rating.
Drive voltage rating DC bus voltage level
200 V 390 V
400 V 780 V
575 V 930 V
When a braking resistor is used, Pr 00.015 should be set to Fast ramp mode.
The internal / heatsink mounted resistor is suitable for applications with a low level of
regen energy only. See Table 4-6.
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 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 section 4.10.3 Braking resistor
software overload protection on page 66.
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.
Parameter
Size 5
200 V drive 400 V drive
Braking resistor rated power Pr 10.030 100 W
Braking resistor thermal time constant Pr 10.031 2.0 s
Braking resistor resistance Pr 10.061 38
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