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Unidrive M Regen Design Guide 39
Issue Number: 4
3.9.8 External softstart resistor
The Regen drive inrush current can be controlled by an external softstart resistor/ bypass circuit, this configuration can be used with a Regen system
consisting of multiple Regen, multiple motoring or single Regen, multiple motoring drives.
For correct sizing of the softstart resistor, refer to section 11.2 Softstart resistor sizing on page 308.
A range of suitable pulse withstanding resistors are available from Metallux (PWR-R).
3.10 Combined Regen input filters (combi filter)
The combi filter is a simplified solution consisting of a combined EMC filter and switching frequency filter, refer to section 4.7.2 Combined Regen input
filters (combi filter) on page 75 for further information.
Table 3-23 Combi filter selection
* Regen inverter output current derating must be applied where necessary based on Regen inductor and combi filter capability.
The range of combi filters covered in this section are available from Schaffner, the filters are not stocked by the supplier of the drive.
Only pulse withstanding resistors should be used for charging the inverter system.
Combi filters listed in Table 3-23 below are equipped with an internal thermal switch to prevent the EMC filter inductor from overheating.
The thermal switch must be configured to open the main supply contactor in the event of a thermal overload.
Regen inverter output current derating must be applied where necessary based on Regen inductor and combi filter capability. Models
affected are denoted with * in Table 3-23 below. Combi filters listed in Table 3-23 are suitable for use in systems with less than 2 % THD
v
on the grid.
Model
Schaffner model
number
Current rating Voltage rating Rated frequency
Heavy duty Normal duty A Vac Hz
07400660 & 07400770 06400470 & 074000660 FS6085-83-35-2 83 480 50/60
07401000 & 08401340* 07400770 & 07401000 FS6085-125-35-2 125 480 50/60
08401570 08401340 FS6085-168-40-2 168 480 50/60
09402000 & 09402240* 08401570 & 09402000* FS6085-205-40-2 205 480 50/60
10402700 & 10403200* 09402240 & 10402700* FS6085-300-99-2 300 480 50/60
10403200* FS6085-350-99-2 350 480 50/60
10601780 10601500 & 10601780 FS6085HV-200-40-2 200 690 50/60
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