The 1336-BDB-SP48A board is a spare part for the Allen-Bradley Bulletin 1336 family of adjustable frequency drives.  This particular spare part is a PCB or gate drive board that is compatible for use with the 1336 Plus (S), Plus II (F), Force (T), and Impact (E) drives. The PCB can be used with a voltage rating of 575 Volts AC and it comes with a 350 Horsepower output power rating. The normal operating frequency of the PCB is 50 to 60 Hertz. The 1336-BDB-SP48A PCB is an amplifier device that converts a lower power input into a high current that is used by the IGBT brake. The gate drive board turns the IGBT brake on and off and it supplies power to the main control and isolation boards.  The unit is installed between the main control board and chassis, and it is separated and installed on a dedicated gate drive board mounting plate for easy maintenance and removal.

The 1336-BDB-SP48A board connects to the mainboard by using jumper connections. Typical errors that may require gate driver board replacement are Error display EE INIT READ 53 messages or when the bus voltage is not present even if the power is applied. The input and output power connections are made through terminal block TB1 on the gate drive board for drives with Frame Size B and ratings of 1 to 15 Horsepower and 240 Volts, 1 to 30 Horsepower and 380 Volts, or 1 to 20 Horsepower and 600 Volts. Drives with higher Horsepower ratings and frame sizes C, D, E, G, and H have TB1 terminal blocks that 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-SP48A 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 values on terminal block TB1. Begin drive service only when the bus voltage has been discharged to 0 Volts.