The main products

Spare parts spare parts, the DCS control system of PLC system and the robot system spare parts,Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

Products are widely used in metallurgy, petroleum, glass, aluminum manufacturing, petrochemical industry, coal mine, papermaking, printing, textile printing and dyeing, machinery, electronics, automobile manufacturing, tobacco, plastics machinery, electric power, water conservancy, water treatment/environmental protection, municipal engineering, boiler heating, energy, power transmission and distribution and so on.

PFSA140 3BSE003816R1 Excitation control module

Internal field exciter FEX2 is a half controlled bridge that can control the field current in one (positive) direction. Because of the nature of the half controlled bridge, a very small amount of current (5...10%) flows always through the bridge if the field contactor is closed. SDCS-FEX-2 is controlled via a serial communication link. FEX2 measures the field current and sends the value to the drive via serial communication. Acknowledge The measured field current is used to form an acknowledge signal. If the field current exceeds the overcurrent limit, the drive will trip to the fault FIELD EX 1 OVERCURR. A low level of field current blocks the controllers immediately, but the low level must be active at least 6 seconds before the drive will trip to the fault: NO FIELD ACK.

External Field Exciter DCF503-0050

 For the control point of view the DCF503-0050 is similar to SDCSFEX-2. The differences are that DCF503-0050 can handle a higher field current than SDCS-FEX-2, and its mechanical size is larger. The control board type is SDCS-FEX-32. External Field Exciter DCF504-0050 External field exciter DCF504-0050 can control the field current either to the positive or negative direction. The direction is selected by the sign of the field current reference. A positive sign means "forward" bridge and negative sign "reverse" bridge. The field current supervision logic is handled in the same way as in SDCS-FEX-2. The control board type is SDCS-FEX-31.

AI/DI Connected Field Exciters

 When modifying existing machines ("revamping") the old field exciters are often reused. In this case an acknowledge signal must be formed in order to supervise the field function. This can be done using either digital or analog input. When a digital input is used to form the acknowledge signal, the function is similar to that used with FEX1, the diode field exciter. Acknowledge Selection The acknowledge signal is selected with the same parameter that is used for selecting the field exciter type. Acknowledge signal is connected to input [F1 ACK] (1304)