Allen-Bradley 1336-RFB-30-A-4 Retrofit-Ready RFI Filter for 1336 PLUS Control Systems
The Allen-Bradley 1336-RFB-30-A-4 is a 30-ampere input RFI (Radio Frequency Interference) filter engineered for use with the 1336 PLUS and 1336 PLUS II series of AC variable-frequency drives. As legacy 1336 PLUS installations continue to operate across manufacturing plants, water treatment facilities, and process automation environments, the demand for verified retrofit-ready replacement components has grown significantly. This filter provides direct form-fit-function compatibility with the original Rockwell Automation specification, making it the preferred choice for engineers managing aging drive systems without full panel redesigns.
When retrofitting an existing 1336 PLUS drive cabinet, the 1336-RFB-30-A-4 is typically installed on the AC input side of the drive to suppress conducted EMI emissions and comply with EN 55011 / IEC 61800-3 Category C2 requirements. Before installation, engineers should verify the upstream power supply capacity — the filter introduces a small insertion impedance and must be matched to the drive’s rated input current. The terminal block layout of the 1336-RFB-30-A-4 is compatible with standard DIN-rail mounted wiring practices used in 1336 PLUS control cabinets, and no additional mounting adapters are required when replacing an original unit in situ.
In multi-axis retrofit projects, this filter is commonly deployed alongside the 1336-BRF-30-A dynamic braking resistor module and the 1336-MOD-D2 communication adapter to maintain the original drive’s DeviceNet or DH-485 communication links. When the host PLC — typically a 1747-L553 SLC 5/05 or a 1756-L71 ControlLogix processor — is retained during the upgrade, preserving the existing program logic and I/O map is critical. The 1336-RFB-30-A-4 does not affect the drive’s parameter set or communication node address, so no re-commissioning of the PLC program is required solely due to filter replacement.
For installations where the 1336 PLUS drive is being replaced by a newer PowerFlex 40 or PowerFlex 400 drive, the 1336-RFB-30-A-4 can still serve as the input EMI filter if the new drive’s input current rating matches the 30A specification. In such migration scenarios, the control cabinet’s 1492-IFM20F interface modules and existing terminal block wiring can often be retained, reducing rewiring labor. Engineers should confirm that the new drive’s control wiring — including the 22-HIM-C2S remote HMI panel and any 20-COMM-D DeviceNet communication cards — is mapped correctly before energizing the system.
Backplane and rack integrity should also be assessed during any 1336-series retrofit. If the system uses a 1746-A7 SLC 500 I/O chassis with analog input modules such as the 1746-NI4, verifying that the chassis power supply — typically a 1746-P4 — can support the combined load of all installed modules is essential before restoring production. The 1336-RFB-30-A-4 does not draw power from the backplane, but its installation may coincide with a broader I/O audit that uncovers marginal power budgets in aging racks.
Field commissioning after filter replacement should include a conducted emissions test at the drive input terminals, a check of the PE (protective earth) bonding continuity between the filter housing and the cabinet chassis, and a verification of the drive’s output current waveform using a clamp meter. If the original 1336 PLUS drive exhibited nuisance tripping due to EMI-induced noise on the encoder feedback cable or the 1336-GM-1 gate driver board, replacing the 1336-RFB-30-A-4 often resolves these faults without further drive-level intervention.
All units supplied by SMARTNEXMSK are sourced from verified industrial channels, individually inspected prior to dispatch, and covered by a 12-month warranty against manufacturing defects. Stock is maintained in Xiamen for prompt international shipment. Each unit ships with a test report and is packaged in anti-static, moisture-resistant material suitable for long-distance freight.
Upgrade Compatibility Table
| Parameter | Specification / Recommendation |
|---|---|
| SKU | 1336-RFB-30-A-4 |
| Brand | Allen-Bradley / Rockwell Automation |
| Series Compatibility | 1336 PLUS, 1336 PLUS II, 1336 IMPACT (30A input rating) |
| Rated Current | 30A AC Input |
| Mounting | Panel / DIN-rail compatible; no adapter required for in-place replacement |
| Terminal Interface | Screw-type terminals; compatible with original 1336 PLUS cabinet wiring |
| Communication Impact | None — does not affect DeviceNet, DH-485, or ControlNet node addressing |
| EMC Standard | EN 55011 / IEC 61800-3 Category C2 |
| Replacement Recommendation | Direct drop-in for original 1336-RFB-30-A-4; verify PE bonding after installation |
| Commissioning Check | Conducted emissions test, PE continuity, output current waveform verification |
| Warranty | 12 months from date of shipment |
Retrofit Planning for Existing Automation Systems
A successful 1336 PLUS retrofit begins with a full audit of the control cabinet. Identify all installed modules: the drive itself, the input filter (1336-RFB-30-A-4), any dynamic braking resistors, the communication adapter (such as the 1336-MOD-D2 for DH-485 or a 1336-GM-1 gate driver), and the associated I/O wiring to the host PLC. In SLC 500-based systems, the 1747-L553 processor and its 1746-A7 chassis typically host analog modules like the 1746-NI4 for process feedback and digital output modules for drive enable/fault signals. Document the existing terminal block assignments before disconnecting any wiring.
For ControlLogix-based systems using a 1756-L71 processor, the drive interface is often handled through a 1756-DNB DeviceNet bridge module. Confirm the drive’s node address and EDS file version before replacing any hardware. The 1336-RFB-30-A-4 replacement does not require changes to the EDS configuration, but if the drive firmware is being updated simultaneously, a full I/O re-scan may be needed. Remote HMI panels using the 22-HIM-C2S or legacy PanelView 550 displays should be tested for communication continuity after the retrofit is complete.
Downtime Control During System Migration
Minimizing unplanned downtime during a 1336 PLUS filter replacement requires preparation. Before the maintenance window, pre-stage the 1336-RFB-30-A-4 replacement unit, verify its ratings against the drive nameplate, and prepare a wiring diagram with terminal labels photographed from the original installation. Back up the drive parameters using a 1336-MOD-D2 or a DriveExplorer-compatible programming cable before any power is removed.
During the replacement, isolate the drive using the upstream disconnect and verify zero-energy state with a calibrated voltage tester. Remove the original filter, install the replacement 1336-RFB-30-A-4, and torque all terminals to specification. Restore power in stages: first verify the control supply, then enable the drive in local mode before returning to PLC-controlled auto mode. This staged approach protects the original program logic and ensures the field control loop — whether PID-based speed control or torque-regulated tension control — resumes without setpoint drift. Total planned downtime for a filter-only replacement is typically under two hours when pre-staged correctly.
Retrofit Support FAQ
Q: Is the 1336-RFB-30-A-4 a direct replacement for the original Allen-Bradley part?
A: Yes. The unit supplied by SMARTNEXMSK is manufactured to the original Rockwell Automation specification and is a direct form-fit-function replacement. No wiring modifications or mounting adapters are required for in-place installation in an existing 1336 PLUS cabinet.
Q: Will replacing the RFI filter affect my PLC program or drive parameters?
A: No. The 1336-RFB-30-A-4 is a passive input filter and has no interaction with the drive’s parameter memory, communication node address, or PLC I/O map. Your existing SLC 500 or ControlLogix program will continue to operate without modification.
Q: What commissioning checks are required after installation?
A: Verify PE (protective earth) bonding continuity between the filter housing and cabinet chassis, perform a conducted emissions check at the drive input terminals, and confirm the drive’s output current waveform is within specification under load. Check all terminal torque values and inspect for correct phase sequencing at the filter input.
Q: What warranty and pre-shipment testing does SMARTNEXMSK provide?
A: Every 1336-RFB-30-A-4 unit is individually inspected and tested prior to dispatch. A test report is included with each shipment. All units are covered by a 12-month warranty from the date of shipment against manufacturing defects. Units are packaged in anti-static, moisture-resistant material for safe international freight.
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