Description
The 20DC085A0ENANNANE is an Allen-Bradley / Rockwell Automation PowerFlex 700S adjustable-frequency AC drive, 400 V AC three-phase input, 85 A continuous output, rated 45 kW (60 HP) normal duty / 37 kW (50 HP) heavy duty. It is the “blank plate” variant of the Frame 4 700S: IP20 / NEMA Type 1 enclosure with conformal coating, Phase II control with expanded cassette, standard incremental-encoder feedback provision, no Human Interface Module (blank plate), no brake IGBT, no drive-mounted brake resistor, no embedded communication module, and a second-environment EMC filter per the CE EMC directive (89/336/EEC).
It is the workhorse of the 380–400 V class: a six-pulse front end, a 540 V DC bus, 4 kHz PWM (selectable 2/4/6/8/10 kHz), and a control engine capable of V/Hz, FORCE™ field-oriented vector control (with or without encoder feedback) and brushless permanent-magnet motor control. For plants that cannot justify a drive migration but cannot afford a stop, the 20DC085A0ENANNANE is the part that keeps the line moving.
Application Scenarios
A bulk-material handling terminal in Northern Europe runs a 45 kW belt conveyor, a 37 kW stacker slew drive and a 30 kW reclaim feeder on three PowerFlex 700S drives in a common DC bus. The conveyor must hold torque at zero speed while a ship-loader positions, then accelerate 180 tonnes of ore without slipping the belt. A V/Hz drive would have needed a 30% oversize and a torque limiter. The 20DC085A0ENANNANE, running FORCE vector control with the standard incremental-encoder feedback option, holds rated torque from 0 to base speed and regulates speed to 0.1% of base speed across a 120:1 range—without encoder, and to a tighter figure with one.
The plant’s real problem was not performance but environment. The drive room sits above a transfer tower; conductive dust, washdown mist and traces of H₂S from the ore pile make it a G3 atmosphere by the ISA-S71.04 definition. The conformal coating on the 20DC085A0ENANNANE is not a cosmetic option—it is the reason the control-board trace under the IGBT gate drive did not become a resistor. When one drive eventually failed after nine years, the fault was a failed heatsink fan, not the coating. A replacement fan, a cleaned heat sink and a re-torqued bus bar returned the drive to service in under two hours. The spare on the shelf was a 20DC085A0ENANNANE, pre-programmed from a saved drive project, and the only configuration change required was the node address.
The same drive solves a different problem in a water utility. Here the load is a 40 kW centrifugal pump with a 4–6% continuous regeneration requirement during valve throttling. The 20DC085A0ENANNANE cannot return energy to the line—it has no brake IGBT and no internal brake resistor—so the DC bus rides up and the overvoltage trip fires. The correct, and characteristically PowerFlex, answer is a common DC bus: tie the DC terminals of the pump drive and a second, motoring drive together, and let the regenerated energy become acceleration energy. No resistor, no heat, no trip. That is an architecture, not a setting, and it is the reason experienced Rockwell shops still specify the 700S long after the catalog has closed.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 20DC085A0ENANNANE |
| Manufacturer | Allen-Bradley / Rockwell Automation, Milwaukee, WI, USA (manufactured in Mexico) |
| Product Category | PowerFlex 700S adjustable-frequency AC drive (VFD / variable speed drive) |
| Drive Family | PowerFlex 700S, Phase II control, Frames 1…6 (this unit: Frame 4) |
| Input Voltage | 400 V AC, 3-phase, 50 Hz (operating range 325…528 V AC; 380…400 V drive rating) |
| Input Current | 95.1 A @ 540 V DC |
| Input Power | 56.4 kVA @ 400 V AC, 3-phase, normal duty |
| AC Input Overvoltage Trip | 600 V AC @ 380/400 V (six-pulse, 3-phase bridge) |
| DC Bus Voltage (nominal) | 540 V DC @ 380/400 V |
| DC Bus Overvoltage Trip | 810 V DC @ 380/400 V |
| Maximum Output Voltage | 932 V DC |
| Output Current (continuous) | 85 A @ 540 V DC |
| Output Current (1 min) | 94 A @ 400 V AC, 3-phase, normal duty |
| Output Current (3 sec) | 144 A @ 540 V DC |
| Normal Duty Rating | 45 kW (60 HP) @ 400 V AC |
| Heavy Duty Rating | 37 kW (50 HP) @ 400 V AC |
| Drive-to-Motor Ratio | Max. 2:1 (do not oversize the drive beyond twice the motor FLC) |
| Output Frequency | 0…400 Hz |
| PWM / Carrier Frequency | 4 kHz @ 540 V DC; settings 2, 4, 6, 8, 10 kHz (6 kHz for V/Hz operation only) |
| Efficiency | 97.5% at rated current and nominal line voltage |
| Displacement Power Factor | 0.98 across the speed range |
| Control Method | Phase II: sine-coded PWM with programmable carrier; indirect self-organizing field-oriented (FORCE™) control; current-regulated; brushless PM motor control |
| Speed Regulation | 0.1% of base speed across 120:1 speed range (without feedback) |
| Torque Regulation | ±5% without feedback; 600 rad/s control bandwidth |
| Feedback | Standard incremental encoder option (5 V DC or 12 V DC, 320 mA/channel); also supports resolver and absolute encoder via options |
| Acceleration / Deceleration | Independently programmable, 0…6553.5 s in 0.1 s increments |
| S-Curve | Adjustable 0.5…4.0 s |
| Stop Modes | Coast, Ramp (controlled), Current Limit, DC injection, and combinations |
| Current Limit | Software current limit 105% of motor rated to 200% of drive rated; independent motoring and regenerative limits |
| Overload Protection | Class 10 electronic motor overload per NEC Article 430; motor overtemperature protection per NEC 430.126(A)(2) |
| Short-Circuit / Fusing | 150 A fuse @ 540 V DC; max. circuit breaker 300 A @ 400 V AC; max. motor circuit protector 150 A; dual-element time-delay fuse 90…175 A (heavy duty); non-time-delay fuse 90…275 A |
| Power Ride-Thru | 15 ms at full load |
| Logic Control Ride-Thru | 0.25 s, drive not running |
| Brake IGBT | None (this exact suffix) — common DC bus or external brake chopper required for significant regeneration |
| Brake Resistor | None (no drive-mounted resistor) |
| HIM | No HIM (blank plate) — configure via DriveExecutive / DriveExplorer, remote HIM, or copy from a programmed drive |
| Communication | No embedded comms; DPI port accepts 20-COMM-xx modules: EtherNet/IP, DeviceNet, ControlNet, PROFIBUS-DP, Foundation Fieldbus, LonWorks, RS-485 DF1/SCANport |
| Digital I/O | 6 digital inputs, 2 digital outputs (expandable) |
| Analog I/O | 3 analog inputs, 2 analog outputs |
| EMC Filtering | Second environment filter per CE EMC directive (89/336/EEC), with common-mode choke |
| Control Logic Noise Immunity | Showering arc transients up to 1500 V peak |
| Enclosure | IP20 / NEMA Type 1, with conformal coating |
| Frame Size | Frame 4 |
| Dimensions (H × W × D) | ≈ 759 × 252 × 202 mm (29.9 × 9.9 × 7.9 in) |
| Weight | ≈ 24.5…34 kg (54…75 lb) — varies by revision and packaging |
| Mounting | Vertical panel mount; 100 mm (4 in) clearance above, 50 mm (2 in) below for convection; do not install upside down |
| Cooling | Forced air, heatsink fan (SK-G9-FAN1-F4), heatsink thermistor monitored by microprocessor |
| Operating Temperature | 0…40 °C without derating; up to 50 °C under specified conditions; 85 A rating limited to 45 °C ambient |
| Storage Temperature | –40…85 °C |
| Altitude | 1000 m without derating (derate 1% per 100 m above) |
| Relative Humidity | 5…95%, non-condensing |
| Shock / Vibration | 10 G peak for 11 ms; 0.152 mm displacement, 1 G peak @ 5.5 Hz |
| Certifications | CE, cUL Listed, KC, C-Tick; ABS; ATEX; TÜV FS ISO/EN 13849-1 Cat 3 with Safe Torque-Off option (pre-June 19, 2022 builds); meets/exceeds IEC 61800-9-2 IE2 energy efficiency |
| Safety | Safe Torque-Off (STO) option certified PL d / SIL 2, Cat. 3 |
| Standards | UL 508C (file E59272) |
| Firmware / Software | DriveExecutive, DriveExplorer, Studio 5000 Logix Designer (via comms module) |
