The SC9000 EP arc-resistant variable frequency drive (VFD) is designed to safely contain, cool and redirect exhaust gases in the event of an arc flash incident. Built in an arc-resistant Type 2B enclosure for the strength needed to resist the forces of arc blasts up to 50 kA, the fully integrated arc-resistant drive provides enhanced safety from the front, sides and rear of the enclosure, even with the control doors open.
Medium-voltage variable frequency drives comprise many interconnect power components operating in tandem and should not be considered a simple add-on piece of equipment. This white paper offers a detailed failure mode analysis is presented in several scenarios to illustrate the reason why arc-resistant drives need to be considered.
| POWER RATING | 300-6000 hp |
| INPUT VOLTAGE RATING | 2400-4160 V |
| OUTPUT VOLTAGE RATING |
0-2400 V 0-3300 V 0-4160 V Contact Eaton if higher output voltage is required |
| BASIC IMPULSE LEVEL (BIL) |
60 kV BIL |
| INTERRUPTING RATING | 50 kA rms symmetrical |
| AMBIENT TEMPERATURE (WITHOUT DERATING) |
0 to 40 °C |
| STANDARD OVERLOAD RATING (VARIABLE TORQUE) |
110% for 1 minute out of 10 minutes |
| OPTIONAL OVERLOAD RATING (CONSTANT TORQUE) |
150% for 1 minute out of 10 minutes |
| OUTPUT FREQUENCY |
1-120 Hz |
| UL | 347A |
| NEMA | ICS6/ICS7 |
| CSA | C22.2 |
| IEEE | C37.20.7-2007 |
| THIRD PARTY RECOGNITION/APPROVAL | UL/cUL available for most configurations |
| SEISMIC QUALIFICATION | none |
| ENCLOSURE TYPE |
Arc resistant |
| ACCESSIBILITY |
Front |
| INDOOR SECTION DIMENSIONS (TYPICAL) |
172" w x 50" d x 128" h to 246" w x 50" d x 128" h |
| BUS INSULATION | Heat shrink sleeve |
| BUS SUPPORTS | Glass polyester |
| COOLING | Air cooled with heat pipes |
| SWITCHING DEVICE |
Medium-voltage IGBT |
| DEVICE MOUNTING |
Draw-out inverter |
| ISOLATION TRANSFORMER | 24-pulse |
| INPUT POWER CIRCUIT PROTECTION | Vacuum contactor with current limiting fuses |
| HEAT LOSS | 23 W/hp (typical) |
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