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.

IC698RMX016 VMIVME-5567-100 Gas turbine module

The parameters of the PI controller can be set either with the autotuning or manual tuning function. ARM CURR PI KP (407) determines the gain of the regulator and ARM CURR PI KI (408) determines the integral time constant of the regulator. Scaling of the gain KP PI-controller input and output values are scaled so that gain value 100% produces in the output the same value as can be seen in the input. This kind of scaling is used in the current controller of the DCS500B.

Parameter ARM CONT CUR LIM (409) is the converter actual current at the point where discontinuous current of the armature circuit changes to continuous current. By using autotuning this point will be defined automatically. In manual tuning the point must be measured from the armature circuit by means of e.g. an oscilloscope. Actual converter current value CONV CUR ACT (10501) is set in parameter ARM CONT CUR LIM (409). There is also a status bit B6 at TC_STATUS (11204), bit value 1 = armature current is discontinuous.

Tuning of Current Regulator 

Tuning of the regulator can be done either manually with response tests or with autotuning function, which is activated by setting parameter DRIVE MODE (1201) to 3, when the drive’s main contactor is open. After closing of the main contactor and starting of the drive, the autotuning procedure for the armature current controller will start. The DRIVE MODE (1201) value is set to 0 when autotuning is completed. The autotuning proceeds without user intervention. Motor data have to be set correctly before autotuning is started. More information about tuning can be read in chapter Start-up. Firing Angle Limitation The output signal of the regulator is the firing angle reference (1 = 1°) ARM ALPHA (10401). Its minimum value is limited by means of parameter: The maximum output voltage of the thyristor bridge is limited by parameter ARM ALPHA LIM MIN (413), default value =15

• Field Excitation

 With DCS 500B it is possible to use several kinds of field exciters or a combination of them, depending on the application. This paragraph describes available field exciter units. Functions which use field exciters are also explained.If FEXC SEL (505) = 0, then the field acknowledge signal has no significance. This case is only for testing purposes. The first field exciter and the second field exciter are used with a "Shared motion" function. Internal Diode Field Exciter SDCS-FEX-1 The current setpoint using the FEX1 is selected by selecting an appropriate voltage output from a field transformer. The program does not measure the current value but an acknowledge signal is formed which supervises whether the field exciter has current or not. Other parameter settings are not needed. The acknowledge signal cannot be read directly but if the signal TC_RDY_RUN (11204) bit 2 is zero more than 6 second after ON-command, the drive will trip to the fault: NO FIELD ACK.