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| Task: | Program |
| Function: | Automatic Control |
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Original new SDCS-FEP-1 3BSE006309R0001 SDCS-REB-1C SDCS-DSL-H10 SDCS-FEX-425 INT Control Card
The three-phase field supply converter DCF 501B/502Band DCF601/602 need a separate active Over-voltage Protection unit DCF 505 or DCF 506 to protect the power part against inadmissibly high voltages. The protection unit activates a free-wheeling circuit between the F+ and F- connectors if an overvoltage occurs. The DCF 505/506 consists of a trigger unit. (SDCS-FEP-x) and a free-wheeling thyristor (two in anti-parallel at DCF 506).
The DCF 506 consist of a relay output to indicate a free-wheeling condition to the field supply converter. When the free-wheeling function is triggered, it will last until the DC current is less than appr. 0.5 A. During this time the relay contacts are closed.
There are two trigger units in use:
- SDCS-FEP-1 for systems, used at line voltages up to 500 V; this board is equipped with a 1400 V trigger diode.
- SDCS-FEP-2 for systems, used at line voltages up to 690 V; this board is equipped with a 1800 V trigger diode.
Power Interface SDCS-PIN 41/SDCS-PIN-48/SDCS-PIN-5x
The Power Interface of DcS converter modules model A5/A6/A7 and C4 from 900 A up to 5200 A consists of two boards - the Measuring board SDCS-PIN-51and the Pulse transformer board SCDS-PIN-41. The following figures show the different connections between the SDCS-PIN-41 and SDCS-PIN-51 board depending on the application 2- or 4-quad-rant and the construction type.
SDCS-CON-2A 3ADT309600R0002 of 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 functionality and parameter values are saved inthe 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.
- Digital outputs are forced low.
- Programmable analogue outputs are reset to zero.
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 SDCS-POW-1 generates different levels of voltages. Some of them are transferred via the CON-2 board directly to the boards, where they are used, others are manipulated and then transferred.
RS485 serial communicationchannels
The control board has two RS485 channels. The first channel is used for field exciter control of DCF 501B/502B, DCF 503A/504A or DCF 601/602 (terminals X16:1...3) and the second for the control panel (CDP) at terminals X33 or X34. The terminals X33 and X34 are wired up in parallel internally.
DDCS Channel integrated
The control board SDCS-CON-2 has an integrated DDCS (Digital Drive Control System) channel with a transfer rate up to 4 Mbits/s. This channel (V260) can be used for fieldbus modules with the DCS 500B converters or for the12_PULELINK with DCS600 converters. The terminals X16:4 and 5 are provided for power supply of the modules (+24 V / ≤150 mA).
SDCS-IOB-3 Analog I/O board
The analog I/O board IOB-3 substitutes the standard I/O's on the CON-4 board. Connector X1 and X2 are used to connect the IOB-3 with the CON-4 board via flat cable. To mount the IOB-3 board use a specially designed card holder including finger protection and screen clamps
The analog I/O board SDCS-IOB-3 substitutes the standard analog inputs, standard analog outputs and
standard encoder input on the SDCS-CON-4. This means the analog 1/O and the encoder input on the
SDCS-CON-4 are no longer available.
Connector X1 and X2 are used to connect the SDCS-IOB-3 with the SDCS-CON-4 via flat cable.
To mount the SDCS-IOB-3, use a specially designed card holder including finger protection and screen
clamps.
1. Connector X3 provides analog encoder connection as well as analog input connection (Al1 to Al4)
2. Scaling and adaptations are done via jumpers on the IOB-3 board
3. Connector X4 provides analog output connection for
A01, A02 and actual motor current
Voltage source +/- 10 VDC
Current source for 1.5 or 5 mA
4. Connector X5 provides encoder connection for single ended and differential encoders
Spare part
Fuse data: Bussmann KTK-R-6A (600 V)
The power interface board SDCS-PIN-205 can be used as a replacement of SDCS-PIN-21, 22 and 25. The board SDCS-PIN-206 can be used as a replacement of SDCS-PIN-23 and 24, but not vice-versa. In case of a converter with 450 A/520 A/700 A at 500 V or a converter of 450 A at 600 V additional actions have to be taken into account.
Note
If this PCB is used as a spare part for a DCF..., no modifications are necessary the same board will be used without any modification at a converter used for three-phase field supply.
The control is based on a fully digital system. The μ-processor reads all information from the power part, is supplied with all needed voltage levels and control signals via the flat cable X14 by the SDCS-CON-2 and generates the firing pulses for the power part.
The range of the single phase rated AC input voltage is 110 V to 500 V, the maximum current capability is 16 A. If this field exciter is used for smaller field current, the control unit automatically selects a lower current range between 3 A to 16 A to get the best resolution.
SDCS-FEX-1 (internal)
The Diode Field Exciter board SDCS-FEX-1 is a single phase diode rectifier for an AC input voltage up to 500 V and a DC output current of 6 A. The board has to be mounted inside the armature converter module. The excitation current is defined by the DC output voltage (line voltage multiplied by 0.9) and the resistance of the field winding. By using an external resistor in series with the field winding the field current can be adapted slightly. If the SDCS-FEX-1 board isn't already installed it must be mechanically fixed beside the electronic power part SDCS-POW-1 and connected via a flat cable to the SDCS-CON-2 by using terminal X14.
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