The 1336-BDB-SP7A board is a spare part for the Allen-Bradley Bulletin 1336 family of adjustable frequency drives.  This particular spare part is a PCB gate drive board that is compatible with 1336 Plus and Force drives. The PCB board can be used with a voltage rating of 575 Volts AC and it comes with a 7.5 Horsepower rating. The normal operating frequency of the PCB gate drive board is 50 to 60 Hertz. The 1336-BDB-SP7A PCB is an amplifier device that converts a lower power input into a high current drive used by the IGBT brake. This gate drive board turns the IGBT brake on and off and supplies power to the main control and isolation boards. The unit is installed between the main control board and chassis, installed separately on a dedicated gate drive board mounting plate for easier maintenance and removal. The unit connects to the mainboard by using jumper connections. Typical errors that may make gate drive board replacement necessary are an EE INIT READ 53 error warning message or when the bus voltage is not present even if the power is applied.

Input and output power are made through terminal block TB1 on the 1336-BDB-SP7A gate drive board for drives with a frame size of B (rated at 1 to 15 Horsepower and 240 Volts, 1 to 30 Horsepower and 380 Volts, or 1 to 20 Horsepower and 600 Volts). In drives with higher Horsepower ratings (frame sizes C, D, E, G, and H), TB1 terminal blocks are located on the bottom of the drive where both the input and output power connections need to be made. During the removal of the 1336-BDB-SP7A board, the drive board mounting plate must be removed first. Ensure that the lockout power is disconnected from the drive before disassembly. Verify the presence of voltage by measuring the +DC and -DC voltage levels on terminal block TB1. Initiate drive service only when the bus voltage has been discharged to 0 Volts. Alternatively, the 1336-BDB-SP7A board can be replaced by the 1336-CONV-SP7A (Series A to C) board or the 1336-BDB-SP7D gate drive board.