Product Identification
1336 Series Common Bus Precharge Board
The Allen-Bradley 1336-PB-SP5A is a precharge printed circuit board listed for 460 V 1336STEF common-bus drive applications in the X40–X60 HP range. It is a service component within the drive's precharge system, where controlled DC bus charging is part of drive startup and operation.
Product Overview
Technical Specifications
Precharge Function & Drive Application
Role in the DC Bus Charging Process
The precharge circuit supports controlled charging of the drive DC bus before normal inverter operation. The 1336 family troubleshooting information describes precharge completion in relation to stable bus voltage and the operation of the precharge device. In common-bus configurations, the precharge arrangement is part of the drive's shared DC bus operating setup.
Application & Fault Scenarios
Typical System Use
Used as a service spare in the precharge section of supported 460 V 1336STEF common-bus drive installations.
- Industrial AC drive maintenance.
- Common-bus drive service and repair.
- Replacement of a precharge PCB identified during troubleshooting.
- Maintenance inventory for supported drive configurations.
Why It May Be Searched
- Drive precharge sequence does not complete.
- DC bus voltage does not reach the expected stable condition.
- Inspection identifies a suspected precharge-board fault.
- Fuse or resistor test results indicate a board-level issue.
- Maintenance teams need the specified replacement board to restore drive availability.
Production Downtime Consideration
A drive that cannot complete its required precharge sequence may remain unavailable for operation. On equipment dependent on that drive, the resulting interruption can delay machine startup, production recovery or maintenance handover.
Precharge Board Diagnostics
Component Checks Listed in 1336 Troubleshooting Procedures
The 1336 drive troubleshooting procedure for its covered drive variants specifies resistance checks at the precharge board after isolating the drive and disconnecting connector J1.
| Test Point | Nominal Resistance Reading |
|---|---|
| Fuse F1 | 0 Ω |
| Fuse F2 | 0 Ω |
| Resistor R1 | 80 Ω |
| Resistor R2 | 80 Ω |
| Resistor R3 | 80 Ω |
| Resistor R14 | 80 Ω |
| Combined resistance of R15 and R16 | 80 Ω |
- If readings do not match the specified test values, the covered procedure directs replacement of the precharge board.
- If board readings are correct, inspect wiring and connectors between precharge-board connector J1 and base-driver-board connector J7.
- Also inspect wiring and connections between the precharge SCR M1 and the precharge board.
The listed resistance values are from the 1336 troubleshooting procedure covering 1336 B040–B050, 1336 C040–C050 and 1336VT B050–B060 drive variants. Confirm that the procedure and board configuration apply to the specific drive being serviced before using these values.
Compatibility & Replacement Checks
Before Selecting the Replacement
- Match the complete drive catalog number and 1336STEF designation.
- Confirm the 460 V class and X40–X60 HP application range.
- Verify that the drive uses the common-bus (CB) configuration.
- Compare the installed board's catalog number and physical identification.
- Check the precharge-board connector and associated wiring against the applicable service procedure.
- Confirm whether the fault is on the precharge board, associated wiring or precharge SCR before replacing components.
Service Documentation
These publications cover 1336 drive identification, spare-part selection, precharge-board testing, DC bus safety checks and related troubleshooting procedures. Select the procedure according to the installed drive model and frame.
Frequently Asked Questions
It is listed for 460 V 1336STEF common-bus drive applications in the X40–X60 HP range.
Check the DC bus condition, precharge board, associated connectors and wiring, and the precharge SCR according to the applicable drive troubleshooting procedure.
The test identifies fuses F1 and F2, resistors R1, R2, R3 and R14, and the combined resistance of R15 and R16.
Inspect the wiring and connectors between precharge-board connector J1 and base-driver-board connector J7, along with the connections between the precharge SCR and the board.
Provide the complete drive catalog number, voltage and horsepower rating, common-bus configuration, existing board label and a clear nameplate or board photograph.
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Delivery & Warranty
Pre-dispatch: Part number and available product condition are checked against the order. Packaging is selected for international transport.
Warranty: 12 months, subject to quotation terms and confirmed product condition.
DOA / Returns: Report delivery discrepancies or DOA issues promptly with order details and photos. Returns require prior authorization and are subject to inspection and agreed terms.
