Nidec Unidrive M600 Series - Component sizing; 11.1 Switching frequency filter (SFF) protection; 11.2 Softstart resistor sizing

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308 Unidrive M Regen Design Guide
Issue Number: 4
11 Component sizing
11.1 Switching frequency filter (SFF) protection
For SFF branch circuit protection refer to section 3.9.3 Switching frequency filter capacitor on page 30.
11.2 Softstart resistor sizing
Table 11-1 DC bus capacitance and inductance values
* Frame size 9A only.
Where the Regen drive inrush current is to be controlled by an external softstart resistor / bypass circuit, the softstart resistance can be calculated
using the procedure detailed in section 11.2.1 Procedure on page 309.
The softstart resistor must be calculated for multiple drive systems due to the increased inrush current where a Unidrive M Rectifier is not used.
A softstart resistor will also be required for applications where the total DC bus capacitance of the motoring drives is greater than that of the Regen
drive (one large drive supplying several smaller drives).
Voltage Model
Total DC bus capacitance Total DC bus inductance AC inductance per phase
FmHH
200 V
03200050 1560
03200066 to 03200106 1560
04200137 & 04200185 1760 0.5
05200250 1560 1.1
06200330 & 06200440 3000 0.322
07200610 to 07200830 4680 0.253
08201160 & 08201320 7020 110
09201760 & 09202190 10920
82*
10202830 & 10203000 10920
400 V
03400025 to 0300045 220
0300062 390
03400078 & 03400106 390 1
04400150 & 04400172 660 1.331
05400270 & 05400300 780 1.1
06400350 to 06400470 1500 0.644
07400660 to 07401000 2340 0.423
08401340 & 08401570 3510 170
09402000 & 09402240 5460
82*
10402700 & 10403200 7020
11403770 8585
11404170 & 11404640 9360
575 V
05500030 to 05500069 260 2.685
06500150 & 06500190 500 1.57
06500230 to 06500350 1000 0.785
07500440 & 07500550 780 1.27
08500630 & 08500860 1300 520
09501040 & 09501310 3120
240*
10501520 & 10501900 3120
11502000 to 11502850 4160
690 V
07600190 to 07600540 780 1.27
08600630 & 08600860 1300 520
09601040 & 09601310 3120
240*
10601500 & 10601780 3120
11602100 to 11602630 4160
Only pulse withstanding resistors should be used for charging the inverter system.
CAUTION