Nidec Unidrive M600 Series - Page 309

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Unidrive M Regen Design Guide 309
Issue Number: 4
11.2.1 Procedure
The following procedure and data should be used to calculate the resistor(s) required:
1. Calculate the total DC bus capacitance of the system (refer to Table 11-1).
2. Calculate the energy stored in the systems DC bus capacitance at the maximum supply voltage.
3. Calculate the minimum number of resistors required to meet this energy value (round up to the nearest one).
4. Calculate the series parallel arrangement of resistors ensuring the total resistance is  the minimum values given in Table 11-2.
DC bus capacitor energy is calculated from 0.5 x C
N
x 1.2 x V
2
BUS
. Where C
N
is the nominal DC bus capacitance (Table 11-1) and the 1.2 factor
allows for capacitance tolerance. V
BUS
is calculated from 2 x V
LL
(+10 %) where V
LL
is the nominal line to line AC voltage.
Table 11-2 Minimum softstart resistor value
Drive
Recommended minimum resistor value ()
03200066
20
03200080
03200106
03400025
03400031
03400045
03400062
03400078
03400100
04200137
30
04200185
04400150
04400172
05200250 14
05400270 29
05400300 26
05500030 30
05500040 30
05500069 30
06200330 12
06200440 9
06400350 22
06400420 19
06400470 14
06500100 33
06500150 33
06500190 33
06500230 33
06500290 28
06500350 23
07200610 5
07200750 5
07200830 5
07400660 11
07400770 11
07401000 8
07500440 16
07500550 16
07600190 33
07600240 33
07600290 33
07600380 33
07600440 23
07600540 23
08201160 3