Allen-Bradley 20-HIM-A0

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SKU: 20-HIM-A0 Category: Drive Brand: Allen-Bradley

The Allen-Bradley 20-HIM-A0 is a blank/cover plate module belonging to the Human Interface Module (HIM) accessory family for the PowerFlex 700 and PowerFlex 700S series AC drives. Rather than a functional display unit, the 20-HIM-A0 serves as a cover or blank faceplate that occupies the HIM port on the drive when no operator interface is required. It is manufactured by Allen-Bradley, a brand of Rockwell Automation, and is designed to maintain the enclosure integrity of the drive when a full HIM panel is not installed.

The 20-HIM-A0 blank cover is designed to fit the standard HIM port found on PowerFlex 700 series drives, physically sealing the port opening to prevent ingress of dust and contaminants. It does not provide any display, keypad, or communication functionality, as its sole purpose is mechanical coverage. The cover is constructed to match the drive's enclosure rating requirements and snaps securely into the HIM port without tools. It is compatible with the standard HIM port dimensions used across the PowerFlex 700 drive family.

The 20-HIM-A0 is used in industrial installations where the drive is controlled entirely via network communication or remote I/O, and local operator access via a HIM panel is not needed or desired. Typical applications include automated manufacturing lines, conveyor systems, pump and fan control panels, and HVAC installations where the drive is integrated into a PLC-controlled system. Using a blank cover in these scenarios prevents accidental parameter changes at the drive and protects the port from environmental contamination in factory and process environments.

Technical Specifications

Series/Product Family	PowerFlex 700 / PowerFlex 700S
Module Type	Blank Cover / Faceplate
HIM Port Compatibility	Standard PowerFlex HIM port
Mounting	Snap-in, tool-less installation into HIM port
Communication Interface	None (non-functional cover)
Display	None
Keypad	None
Input/Operating Voltage	Not applicable (passive component)
Power Consumption	0 W (no electrical function)
Operating Temperature	-20 to +70 degrees C
Storage Temperature	-40 to +85 degrees C
Certifications	UL, CE (as part of PowerFlex 700 drive system)

Common Fault Codes

Fault Code 81: HIM communication loss. The drive detects that the HIM module or port is not responding as expected.
Verify the HIM or cover plate is fully seated in the HIM port. If using a blank cover, check that the drive parameter for HIM loss action is configured correctly to ignore the absent HIM.
Fault Code 82: HIM self-test failure. The drive's internal diagnostic detects an issue with the HIM interface circuitry.
Remove and reseat the HIM or blank cover. If fault persists, inspect the HIM port connector on the drive for damage or contamination and replace the HIM module or cover as needed.
Fault Code 70: Power loss fault. Drive input power has dropped below acceptable levels during operation.
Check incoming supply voltage at the drive input terminals. Verify that all input fuses and circuit breakers are intact and that supply voltage is within the drive's rated input range.
Fault Code 12: Hardware overcurrent. Drive output current has exceeded the hardware overcurrent trip threshold.
Check motor and output wiring for short circuits or ground faults. Verify motor load conditions and ensure the drive is correctly sized for the application.
Fault Code 13: Ground fault. A ground fault has been detected on the drive output.
Inspect motor cables and motor windings for insulation breakdown. Disconnect the motor and test insulation resistance. Replace damaged cables or motor as required.
Fault Code 33: Auto-restart attempts exceeded. The drive has attempted to automatically restart after a fault the maximum configured number of times without success.
Identify and resolve the underlying fault that is causing repeated trips before re-enabling auto-restart. Review fault queue history via a connected HIM or DriveExplorer software.
Fault Code 29: Analog input loss. The analog reference signal has been lost or fallen below the configured minimum threshold.
Check the analog input wiring and signal source. Verify that the signal level is within the configured input range and that the source device is functioning correctly.

Frequently Asked Questions

What is the purpose of the 20-HIM-A0 and does it provide any control functionality?

The 20-HIM-A0 is a blank cover plate that fills the HIM port on PowerFlex 700 series drives when no operator interface is required. It provides no display, keypad, or communication functionality and is purely a mechanical cover.

Which drives are compatible with the 20-HIM-A0 blank cover?

The 20-HIM-A0 is compatible with Allen-Bradley PowerFlex 700 and PowerFlex 700S series AC drives that feature the standard HIM port. It is not intended for use with PowerFlex 40, 400, or other series that use different HIM port formats.

Can the drive operate normally with the 20-HIM-A0 installed instead of a full HIM panel?

Yes, the drive can operate fully via network communication, remote I/O, or hardwired control inputs with the blank cover installed. The drive parameters should be configured to not generate a fault on HIM loss if no HIM panel is intended to be connected.

Is any wiring or electrical connection required to install the 20-HIM-A0?

No, the 20-HIM-A0 is a passive mechanical cover with no electrical connections. It simply snaps into the HIM port opening on the drive front panel without any wiring.

Can the 20-HIM-A0 be replaced with a functional HIM panel at a later stage?

Yes, the blank cover can be removed and replaced with a functional HIM such as the 20-HIM-C6S or 20-HIM-A6 at any time, as the HIM port remains fully intact beneath the cover.

Troubleshooting

Drive generates a HIM loss fault after installing the 20-HIM-A0 blank cover

Check drive parameter settings for HIM loss action. The drive may be configured to fault when it does not detect a communicating HIM module on the HIM port.

Navigate to the drive's HIM loss parameter (typically found in the communications or fault configuration parameter group) and set the action to 'Ignore' or 'Alarm' rather than 'Fault' to allow operation without a HIM panel.

Blank cover does not seat securely in the HIM port and appears loose

Inspect the retaining clips on the 20-HIM-A0 and the HIM port opening on the drive for damage or deformation. A loose fit may indicate a damaged clip or incorrect installation.

Ensure the cover is aligned correctly with the port and pressed firmly until the retaining clips engage. If the clips are broken, replace the 20-HIM-A0 with a new unit to maintain enclosure integrity.

Drive cannot be accessed for parameter configuration after blank cover is installed

Without a HIM panel, local parameter access is not available. Confirm whether the drive is connected to a network or whether DriveExplorer or Studio 5000 software is available for remote access.

Connect to the drive using Rockwell Automation DriveExplorer or DriveExecutive software via the drive's communication port, or install a compatible HIM panel such as the 20-HIM-C6S temporarily to access and modify parameters.

Visible contamination or debris entering the drive through the HIM port area despite the blank cover being installed

Inspect the 20-HIM-A0 for cracks, warping, or improper seating that may leave gaps around the port opening. Check that the cover is the correct part for the drive model.

Replace the blank cover if damaged or warped. Ensure the correct cover part number is used for the specific drive variant. Verify the cover is fully and evenly seated around the entire perimeter of the HIM port.

Condition	Repair, Used, Refurbished, New in box (sealed)

Common defects

Common defects on a Allen-Bradley 20-HIM-A0 are:

Power Supply Related Issues

No power / drive not turning on
Blown fuses
Defective rectifier bridge
Damaged DC bus capacitors
IGBT / MOSFET module failure
Overvoltage / undervoltage errors

Control & Electronics Failures

Faulty control board or PCB damage
Firmware or memory corruption
Fieldbus communication errors (Profibus, Modbus, EtherCAT, CANopen)
Input / output circuit damage
Gate driver module failure

Motor Control Problems

Motor not starting or no output
Unstable speed control
No torque output
Trip during acceleration or deceleration
Encoder feedback errors

Thermal & Cooling Defects

Overheating due to failed cooling fans
Defective temperature sensors
Poor heatsink performance

Mechanical & Environmental Damage

Burnt or loose connectors
PCB track damage
Corrosion or moisture ingress
Oil, dust or contamination damage
Cracked solder joints

Error Codes & Drive Trips

Overcurrent faults (OC)
Ground fault / earth leakage error
Short-circuit fault
Motor or drive overload
Overvoltage or undervoltage error
Undervoltage trip when starting or stopping
Phase loss / imbalance
Synchronization issues with multiple drives

Other

Display defect
Control keys or keypad not working
Parameters no longer readable or lost
Brake resistor problems (brake chopper defect)
Internal relays/contactors defective
EMI/RFI interference due to defective filters