SIMOREG DC-MASTER

6RA70 Series

Microprocessor-Based Converters from 6kW to 2500kW for Variable-Speed DC Drives

Applications

Series 6RA70 SIMOREG DC-MASTER converters are fully digital, compact units for three-phase supply which supply the armature and field of variable-speed DC drives with rated armature currents of between 15A and 3000A. The compact converters can be connected in parallel to supply currents of up to 12000A. The field circuit can be supplied with currents of up to 85A (current levels depend on the armature rated current).

Design

Series 6RA70 SIMOREG DC-MASTER converters are characterized by their compact, spacesaving construction. Their compact design makes them particularly easy to service and maintain since individual components are readily accessible. The electronics box contains the basic electronic circuitry as well as any supplementary boards.

All SIMOREG DC-MASTER units are equipped with a PMU simple operator panel mounted in the converter door. The panel consists of a five-digit, seven-segment display, three LEDs as status indicators and three parameterization keys. The PMU also features connector X300 with a USS interface in accordance with the RS232 or RS485 standard. The panel provides all the facilities for making adjustments or settings and displaying measured values required to start up the converter.

The OP1S optional converter operator panel can be mounted either in the converter door or externally, e.g. in the cubicle door. For this purpose, it can be connected up by means of a 5 m long cable. Cables of up to 200 m in length can be used if a separate 5 V supply is available. The OP1S is connected to the SIMOREG via connector X300. The OP1S can be installed as an economic alternative to control cubicle measuring instruments which display physical measured
quantities.

The OP1S features an LCD with 4 x 16 characters for displaying parameter names in plaintext. German, English, French, Spanish and Italian can be selected as the display languages. The OP1S can store parameter sets for easy downloading to other devices.
The converter can also be parameterized on a standard PC with appropriate software connected to the serial interface on the basic unit. This PC interface is used during start-up, for maintenance during shutdown and for diagnosis in operation. Furthermore, converter software upgrades can be loaded via this interface for storage in a Flash memory.

On single-quadrant converters, the armature is supplied via a fully controlled three-phase bridge B6C and, on four-quadrant devices, via two fully controlled three-phase bridges in circulatingcurrent-free, inverse-parallel connection (B6)A(B6)C. The field is supplied via a single-phase, branch-pair half-controlled 2-pulse bridge connection B2HZ.

The frequencies of the armature and field supply voltages may be different (in a range from 45 to 65 Hz). Operation in the extended frequency range between 23 Hz and 110 Hz is available on request. The armature circuit supply phase sequence is insignificant.

For converters with 15A to 850A (1200A at 400V supply voltage) rated DC current, the power section for armature and field is constructed of isolated thyristor modules. The heat sink is thus electrically isolated. On devices with a higher rated DC current, the power section for the armature circuit is constructed of disk thyristors and heat sinks (thyristor assemblies) at voltage potential.

The housing and terminal covers on power connections provide protection against accidental contact for operators working in the vicinity. All connecting terminals are accessible from the front. The power section cooling system is monitored by means of temperature sensors.

Special features of devices with 460V rated connection voltage

• This device series is available with rated direct currents of 30A to 1200A.
• Devices with rated direct currents of 450A to 1200A are equipped with a 1-phase fan.
• On devices with rated direct currents of 60A to 850A, the power terminals are located on the underside and on the top of the device.

Mode of operation

All open-loop and closed-loop drive control and communication functions are performed by two powerful microprocessors. Drive control functions are implemented in the software as program modules which can be “wired up” by parameters.

The rated DC currents (continuous DC currents), load class Ι, specified on the rated plate can be exceeded by 180%, the permissible overload during being dependent on individual converters. The microprocessor calculates the current I2t value of the power section cyclically to ensure that the
thyristors are not damaged in overload operation.

A selection table for overload operation can be found in Section 9 ”Description of functions”. Converters self-adapt to the frequency of the available supply voltage in the range from 45 to 65 Hz (armature and field are independent).

Operation in the extended frequency range between 23 Hz and 110 Hz is available on request.

6RA70 Series_DATASHEET

6RA70 Series