HITACHI SJ300 Modules SJ300TM 3B295619-3 Inverter Terminal Board

Name: HITACHI SJ300 Modules SJ300TM 3B295619-3 Inverter Terminal Board
Brand: Hitachi

Model: SJ300TM 3B295619-3

Brand Hitachi

Series SJ300TM 3B295619-3 Inverter Terminal Board

Model SJ300TM 3B295619-3

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Product Details And Specifications

HITACHI SJ300 Series Technical Notes

The HITACHI SJ300 series is a general-purpose variable frequency drive (VFD) platform deployed extensively across global heavy industry, including petrochemical plants, nuclear auxiliary systems, offshore refineries, and large-scale HVAC infrastructure. Manufactured in Japan, the SJ300 line covers output ranges from 0.4 kW to 400 kW (three-phase 200V and 400V class), making it one of the most widely installed mid-range inverter families in Asia-Pacific and EMEA industrial facilities. Its modular internal architecture — separating the control board, terminal board, gate driver board, power board, and operator panel — means that component-level repair and board replacement remain the primary maintenance strategy for installed base units, particularly in facilities where full drive replacement would require costly re-commissioning.

The Evolution of SJ300 Architecture

The SJ300 platform was introduced by Hitachi Industrial Equipment Systems in the early 2000s as a successor to the L300P and SJ200 series, incorporating enhanced V/f control, sensorless vector control, and expanded communication option slots. The internal PCB architecture evolved through several hardware revisions identifiable by suffix codes on the board label (e.g., 3B295619-1, -2, -3), with each revision addressing EMC compliance updates, IGBT gate drive timing refinements, and thermistor circuit modifications. The SJ300 was officially succeeded by the WJ200 and SJ700 series for new installations, but the SJ300 remains in active service across thousands of legacy installations. Compatibility between hardware revisions is generally maintained within the same frame size, but cross-frame substitution requires verification of connector pinout and firmware version. The SJ300TM terminal board (3B295619-3) is the third hardware revision of the main control terminal interface PCB, responsible for routing analog input/output signals, digital I/O, RS485 communication, and option card interface signals between the operator and the main inverter control board.

SJ300 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components and drive models within the HITACHI SJ300 platform. Each entry reflects a distinct functional role within the drive system.

SJ300TM 3B295619-3: Main inverter terminal board, Rev.3; routes analog/digital I/O and RS485 signals.
SJ300-004LFU: 0.4 kW / 200V class SJ300 inverter, single-phase input, IP20 enclosure.
SJ300-007LFU: 0.75 kW / 200V class inverter, standard V/f and sensorless vector control.
SJ300-015LFU: 1.5 kW / 200V class inverter, built-in EMC filter, DIN rail mountable.
SJ300-022LFU: 2.2 kW / 200V class inverter, supports PID feedback control loop.
SJ300-040LFU: 4.0 kW / 200V class inverter, enhanced braking transistor circuit.
SJ300-075LFU: 7.5 kW / 200V class inverter, expanded I/O terminal block configuration.
SJ300-150LFU: 15 kW / 200V class inverter, dual cooling fan assembly, frame D housing.
SJ300-004HFU: 0.4 kW / 400V class inverter, three-phase input, compact frame A.
SJ300-022HFU: 2.2 kW / 400V class inverter, supports DeviceNet option card slot.
SJ300-055HFU: 5.5 kW / 400V class inverter, integrated DC bus choke terminals.
SJ300-110HFU: 11 kW / 400V class inverter, frame C, supports encoder feedback option.
SJ300-220HFU: 22 kW / 400V class inverter, dual IGBT module configuration, frame D.
SJ300-370HFU: 37 kW / 400V class inverter, forced-air cooling, frame E housing.
SJ300-750HFU: 75 kW / 400V class inverter, large frame, parallel IGBT stack.
SJ300-1500HFU: 150 kW / 400V class inverter, cabinet-mount configuration, dual rectifier bridge.
3B295619-1: Terminal board Rev.1, early production variant; limited RS485 shielding.
3B295619-2: Terminal board Rev.2; updated analog input filter capacitors.
SJ-DV: DeviceNet communication option card for SJ300 option slot.
SJ-PB: PROFIBUS-DP communication option card, compatible with SJ300 frame B–E.

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