Two ground screws
Both ground points bond the drive chassis and provide practical termination positions for the incoming and motor protective-earth conductors.
Allen-Bradley Motion control
component drives
component drives
Allen-Bradley 2071-AP4 / 2071-AP8 Kinetix 3 Component Servo Drives
Product Description
For 400 W and 800 W Kinetix 3 axes, the Allen-Bradley 2071-AP4 / 2071-AP8 are compact component servo drives that combine a 230 V input stage, digital control interfaces, motor feedback processing and regulated three-phase motor output. Each unit controls one physical servo axis without a shared modular power rail.
Inside the enclosure, 2071-AP4 / 2071-AP8 use separate main and control-power terminals, but their accepted mains arrangements differ: AP4 is a single-phase drive, while AP8 can be wired from single- or three-phase input. Both frames provide two chassis-ground screws so the motor-cable shield, protective earth and bonded metal subpanel form a short cabinet grounding path.
Technical Specifications
| Technical Item | 2071-AP4 | 2071-AP8 |
|---|---|---|
| Brand | Allen-Bradley | |
| Product Type | Component servo drive | |
| Series | Kinetix 3 | |
| AC Input Voltage | 170…264 V rms | |
| Accepted Input Phase | Single-phase | Single-phase or three-phase |
| AC Input Frequency | 47…63 Hz | |
| Nominal Input Current | 7.14 A single-phase | 10.52 A single-phase; 6.25 A three-phase |
| Control Power Input | 170…264 V rms | |
| Nominal Control Current | 0.1 A | |
| Control Inrush Current | 31 A | |
| Nominal DC Bus | 311 V DC | |
| Line-Loss Ride Through | 20 ms | |
| Bus Overvoltage / Undervoltage | 405 V DC / 190 V DC | |
| Continuous Output Current | 3.33 A rms | 5.05 A rms |
| Continuous Output Current, 0-pk | 4.67 A | 7.07 A |
| Peak Output Current | 9.9 A rms | 14.99 A rms |
| Peak Output Current, 0-pk | 14.0 A | 21.21 A |
| Continuous Output Power | 400 W | 800 W |
| Velocity / Current Loop Bandwidth | 550 Hz / 2000 Hz | |
| PWM Frequency | 10 kHz | |
| Efficiency | 90% | |
| Short-Circuit Current Rating | 100,000 A rms symmetrical | |
| Approximate Weight | 1.0 kg | 1.75 kg |
| Dimensions A / B / C / D | 153 / 141 / 48.3 / 58 mm | 198 / 186 / 59 / 81 mm |
Cabinet Grounding and Cable Shielding
The Allen-Bradley 2071-AP4 / 2071-AP8 use two chassis-ground points and a local motor-cable shield clamp to return protective and high-frequency currents to the bonded subpanel.
Conductive subpanel
The drive mounts to a bonded metal surface so the chassis and enclosure ground remain connected over a short, low-impedance path.
Prepared shield section
The motor cable jacket is removed only at the clamp location, exposing the shield without uncovering the insulated phase conductors.
Clamp placement
The clamp holds the exposed shield close to the drive and supplies strain relief before the phase wires reach the motor terminals.
400 W and 800 W Supply Topology
The Allen-Bradley 2071-AP4 / 2071-AP8 share the Kinetix 3 control structure but accept different mains phase arrangements around their power classes.
AP4 main input
The 400 W AP4 uses the designated single-phase 230 V input path for its motor-power converter.
AP8 phase choice
The 800 W AP8 accepts either the specified single-phase connection or a three-phase supply across its assigned input terminals.
Control-power branch
Separate control terminals feed the electronics so their fuse and wiring path are coordinated independently of the motor-power input.
Motor-side output
Both drives deliver regulated U/V/W output to one servo motor, with feedback returning through the dedicated low-voltage connector.
Frequently Asked Questions
What input-phase difference applies to Allen-Bradley 2071-AP4 / 2071-AP8?
On 2071-AP4 / 2071-AP8, aP4 uses single-phase input, while AP8 accepts the specified single- or three-phase arrangement. Follow the terminal pattern and protective-device data for the exact model.
Do Allen-Bradley 2071-AP4 / 2071-AP8 have the same physical width?
No. Before wiring 2071-AP4 / 2071-AP8, aP8 uses a larger enclosure than AP4. Update panel cutout, airflow and cable-bend space when moving between the two power classes.
Why are there two ground screws on Allen-Bradley 2071-AP4 / 2071-AP8?
While commissioning 2071-AP4 / 2071-AP8, they support short chassis and protective-earth connections within the cabinet wiring layout. Both remain bonded to the conductive subpanel rather than serving as isolated signal grounds.
How is the motor shield clamped for Allen-Bradley 2071-AP4 / 2071-AP8?
For 2071-AP4 / 2071-AP8, expose the shield only at the defined clamp area and secure it firmly to the grounded bracket. Keep the insulated motor phases intact as they continue to the output terminals.
Why does branch hardware change between Allen-Bradley 2071-AP4 / 2071-AP8?
Within a 2071-AP4 / 2071-AP8 installation, their input currents, phase options and enclosure sizes differ. Select fuse, contactor and conductor size for the exact supply and drive rather than copying the 400 W circuit to the 800 W unit.
Can Allen-Bradley 2071-AP4 / 2071-AP8 replace each other without review?
No. When specifying 2071-AP4 / 2071-AP8, motor rating, input phase, current, body size and protective hardware all change. Confirm the complete axis design before substituting one Kinetix 3 power class for another.
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