DATASHEET Load reactors RWK 305
Three-phase dv/dt Reactor for Efficient Motor Protection
Reduction of drive output voltage dv/dt Approvals
Reduction of motor temperature
Increase of motor service life
Compact and economic open frame design
Standard catalog reactors up to 1100 A
UL 508C up to 182 A. For use with AC or DC drives
UL rated materials used
(power conversion equipment) only
Features and benefits
Efficient reduction of high output voltage dv/dt
from IGBT motor drives
Protection of motor coil insulation from premature
Performance indicators
aging and destruction
Significantly increased servie life of electric motors
High reliablility and secured production up time for
mission critical applications
Reduced converter pulse load
Less interference propagation towards neighboring
equipment of lines
Output filter with low impedance, ideal for
processes requiring exceptional pre- cision and
reproducibility of movements
Vacuum impregnation for reduced humming noise
and high durability
Technical specifications
Typical applications
Maximum continuous operating voltage 3 x 500/288 VAC
60 Hz
Motor frequency
Servo drives
Switching frequency 2 to 16 kHz
Close loop vector drives
Rated currents 4 to 1100 A @ 40C
Motor drive applications with short motor cables
Motor cable length 30 m max. @ 16 kHz (derating curve next page)
Machinery comprising servo or torque motors
Impedance (uk) 0.8% @ 400 VAC, 50 Hz & rated current
Robots
Typical dv/dt reduction factor 5
Pick and place machines
High potential test voltage P > E 3000 VAC for 3 sec
P > P 3000 VAC for 3 sec
Protection category IP 00 (KL types according to VBG 4)
Typical electrical schematic
Overload capability 2 x rated current at switch on for 30 seconds
1.5 x rated current for 1 minute, once per hour
Temperature range (operation and storage) -25C to +100C (25/100/21)
Insulation class T40/N (200C) for 182 A types
T40/F (155C) for 230 A types
Flammability corresponding to UL 94 V-2 or better
Design corresponding to EN 61558-2-20 (VDE 0570-2-20), UL 508C,
CSA C22.2 NO. 14
MTBF @ 40C/400 V (Mil-HB-217F) >500,000 hours2 Reactors Schaffner Group Datasheets 11 Oct 2018
Reactor selection table
Reactor Rated current Typical motor Nominal Typical Input/Output Weight
@ 40C power rating* inductance power loss** connections Total
[A] [kW] [mH] [W] [kg]
RWK 305-4-KL 4 1.5 1.47 22 KL 1.2
RWK 305-7.8-KL 7.8 3 0.754 25 KL 1.2
RWK 305-10-KL 10 4 0.588 30 KL 1.8
RWK 305-14-KL 14 5.5 0.42 34 KL 2.2
RWK 305-17-KL 17 7.5 0.346 38 KL 2.5
RWK 305-24-KL 24 11 0.245 45 KL 2.5
RWK 305-32-KL 32 15 0.184 55 KL 3.9
RWK 305-45-KL 45 22 0.131 60 KL 6.1
RWK 305-60-KL 60 30 0.098 65 KL 6.1
RWK 305-72-KL 72 37 0.082 70 KL 6.1
RWK 305-90-KL 90 45 0.065 75 KL 7.4
RWK 305-110-KL 110 55 0.053 90 KL 8.2
RWK 305-124-KS 124 55 0.047 110 KS 8.2
RWK 305-143-KS 143 75 0.041 115 KS 10.7
RWK 305-156-KS 156 75 0.038 120 KS 10.7
RWK 305-170-KS 170 90 0.035 130 KS 10.7
RWK 305-182-KS 182 90 0.032 140 KS 16
RWK 305-230-KS 230 132 0.026 180 KS 22
RWK 305-280-KS 280 160 0.021 220 KS 29
RWK 305-330-KS 330 160 0.018 240 KS 32
RWK 305-400-S 400 200 0.015 330 S 34
RWK 305-500-S 500 250 0.012 340 S 35
RWK 305-600-S 600 355 0.01 380 S 37
RWK 305-680-S 680 400 0.009 410 S 38
RWK 305-790-S 790 450 0.007 590 S 43
RWK 305-910-S 910 500 0.006 740 S 49
RWK 305-1100-S 1100 630 0.005 760 S 66
* General purpose four-pole (1500 r/min) AC induction motor rated 400 V/50 Hz.
** Exact value depends upon the motor cable type and length, switching frequency, motor frequency and further stray parameters within the system.
Reactor derating
The maximum admissible motor cable length depends mainly on the switching frequency and the drive output voltage. The applicable value for a given application
can be found in the derating curve below.