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The Allen-Bradley 1336-SN-SP21A PCB is an inverter snubber board that is made for the 1336 Plus, Plus II, Impact, and Force series AC drives. It is compatible with the C-frame 1336 drives with a 460 Volts AC voltage rating and X40 to X60 Horsepower or 20 to 30 Horsepower output power ratings.
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| Manufacturer | Allen Bradley |
|---|---|
| Category | Drives |
| Product Line | 1336 PCB Boards |
| Part Number | 1336-SN-SP21A |
| Weight | 1.31 lbs (0.60 kg) |
| Description | PCB Precharge and Inverter Snubber Board |
| Voltage | 460 Volts AC |
| Power Rating | X40 to X60 Horsepower |
| Frame | C |
| Units of Kits per Drive | 1 |
| Location Within The Drive | Behind the control board |
| Documentation | 1336 IMPACT-6.2, 1336 FORCE-6.2, or 1336 PLUS-6.2 trouble-shooting guide |
| Operating Temperature | 0 to 50 Degrees Celsius |
| Product Lifecycle Status* | Discontinued/Obsolete |
* The Allen Bradley 1336-SN-SP21A has been discontinued by the manufacturer, however we specialize in obsolete parts and can likely still supply surplus and/or refurbished replacement 1336-SN-SP21A units instead of migration.
The Allen-Bradley 1336-SN-SP21A PCB inverter is also a precharge snubber board (Common Bus) that is an inverter snubber board for the 1336 Impact, Force, Plus, and Plus II AC drives. It is designed to suppress voltage transients within the drive's circuit, and it is located close to the drive’s heatsink at the back of the inverter assembly. The 1336-SN-SP21A inverter snubber assembly consists of an inverter snubber and some installation accessories that include fastening screws and an installation manual. The 1336-SN-SP21A snubber board can serve as an inverter snubber replacement part for the C frames 1336 Impact, Force, Plus, and Plus II AC drives with 20 to 30 Horsepower output ratings, and a precharge snubber replacement for the C-frame Impact, Force, Plus, and Plus II AC drives with 460 Volts AC voltage ratings and X40 to X60 Horsepower power ratings.
The 1336-SN-SP21A snubber board is an inverter snubber that is found within the power module snubber board, and it should be tested for good working conditions whenever a power module is replaced. Testing is done by using a meter and comparing results with the standard table readings. Replacing the snubber board requires removing power from the drive and checking for the absence of residual voltage at the appropriate terminals. After that, the technicians should detach the control board mounting frame (plate), the precharge board mounting frame, and the inverter assembly to access the snubber board. Disconnect the 2 jumper connectors (J1 and J2) on the board and detach the snubber board from the mounting bracket. Replace the old snubber board with a new one like the 1336-SN-SP21A snubber board and install it by following steps in the reverse order of the removal process.