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.

VE3007 KJ2005X1-BA1 12P4375X012 Control module

Watchdog function The control board has an internal watchdog. The watchdog controls the running of the control board program. If the watchdog trips, it has the following effects: - FPROM programming voltage is forced low. - Thyristor firing control is reset and disabled. - Digital outputs are forced low. - Programmable analogue outputs are reset to zero, 0V.

RS485 serial communication channels The control board has two RS485 channels. The first channel is for field exciter control (terminals X16:1...3) and the second for the control panel (CDP 310) at terminals X33 or X34. The terminals X33 and X34 are wired up in parallel internally.

Digital outputs are forced low. - Programmable analogue outputs are reset to zero, 0V. Seven segment display A seven segment display is located on the control board and it shows the state of drive.

Auxiliary power distribution

 The electronic power supply board POW-1 (see separate chapter) generates different levels of voltages. Some of them are transferred via the CON-1 board directly to the boards, where they are used, others are manipulated and then transfered.

Supply voltage monitoring The control board monitors the following voltage levels: The electronic power supply system with the different voltage levels is monitored in two ways. There is a signal powerfail primary, which monitors the input power supply voltage of the POW-1 board and a signal powerfail secondary, which monitors the low voltage levels. If one voltage level drops below the threshold a trip signal is generated. In addition to that there is a monitoring function for the 5 V level. If +5 V drops under the tripping level, it causes a master reset by hardware. All I/O registers are forced to 0 and the firing pulses are suppressed.

Memory circuits and the back-up 

The program including system and parameter values is stored at Flash PROM D33. Different programs can be downloaded directly to these PROMs. Application functionallity and parameter values are saved in the Flash PROM D35. Fault and Alarm messages -the time of their appearance and some other values like the operating hours and so on- are stored in static RAM circuits. They have a back up capacitor of 1 F, which lasts minimum 8 hours, typically several days. It takes about 30 minutes to charge the backup capacitor. ASIC function ASIC = Application Specific Integrated Circuit Most of the measurements and control functions for the DCS500 are done in the ASIC: - communication with control panel (RS 485) - communication with field exciters (RS 485) - measurement - watchdog function - A/D and D/A-conversion control - thyristor firing pulse generation Watchdog function The control board has an internal watchdog. The watchdog controls the running of the control board program. If the watchdog trips, it has the following effects: - Writing to FPROM is disabled. - Thyristor firing control is reset and disabled.