Siemens DC Drive 6RA70 Converters for single-quadrant operation

SIMOREG DC-MASTER chassis converters 6RA70
for single-quadrant operation B6C

with an antiparallel circuit with two fully-controlled six-pulse bridge circuits

B6C (rated DC currents 15 A to 2000 A).

For the rated input voltages:

  • 3-ph. 400 V AC
  • 3-ph. 575 V AC
  • 3-ph. 690 V AC
  • 3-ph. 830 V AC
  • 3-ph. 950 V AC

Siemens DC Drive 6RA70 Converters Technical specifications

Type of cooling

Converters ≤ = 125 A rated armature current:
Permissible ambient air temperature during operation


0 °C to 45 °C

Converters ≥ = 210 A rated armature current:
permissible ambient temperature during operation

Enhanced air cooling with installed fan
0 °C to 40 °C

Permissible ambient temperature during storage and transport

-25 °C to +70 °C

Installation altitude

≤ 1000 m above sea level (100 % load rating)
> 1000 m to 5000 m above sea level

Control stability

Δn = 0.006 % of the rated motor speed, valid for pulse encoder operation and digital setpoint

Δn = 0.1 % of the rated motor speed valid for analog tacho and analog setpoint 2)

Humidity class

Relative air humidity ≤ = 95 %,
dewing not permissible 1)

Climate class

Class 3K3 acc. to DIN IEC 60 721-3-3


Pollution severity 2 acc. to DIN VDE 0110-1 (HD 625.1 S: 1996)
dewing not permissible

Overvoltage category

Category III acc. to
DIN VDE 0110-1 for power section and power supply
Category II acc. to
DIN VDE 0110-1 for electronics

Overvoltage resistance

Class 1 acc. to
DIN VDE 0160

Degree of protection

IP00 acc. to EN 60 529

Safety class

Class I acc. to
DIN VDE 0106, part 1

Shock hazard protection

Acc. to DIN VDE 0106
part 100 (VBG4) and
DIN VDE 0113 part 5

RI suppression

No RI suppression acc. to EN 61 800-3


> 200,000 h acc. to
SN 29500

Mechanical rigidity

Acc. to DIN IEC 60 068-2-6

For stationary use constant amplitude:

  • of acceleration

0.075 mm in frequency range 10 Hz to 58 Hz

  • of displacement

9.8 ms -2 (1 x g) in frequency range > 9 Hz to 500 Hz

For transport constant amplitude

  • of displacement

3.5 mm in frequency range
5 Hz to 9 Hz

  • of acceleration

9.8 ms -2(1 x g) in frequency range > 9 Hz to 500 Hz


UL/cUL 3)

UL-File-Nr.: E203250

Applicable standards

DIN VDE 0106 part 100

Arrangement of operator control elements in the vicinity of components/parts at hazardous voltage levels.

DIN VDE 0110 part 1

Insulation coordination for electrical equipment in low-voltage installations

EN 60 146-1-1 / DIN VDE 0558T11

Semiconductor converters
General requirements and line commutated converters

EN 50178 / DIN VDE 0160

Regulations for the equipment of electrical power installatons with electronic equipment.

EN 61800-3

Variable speed drives Part 3, EMC product standard including special test procedures

EN 60068-2-6 acc. to degree of severity 12
(SN29010 part 1)

Mechanical stress

1) 75 % at 17 % annual mean
95 % at 24 °C max.

2) Conditions:
The control stability (PI control) is referred to the rated motor speed and applies when the SIMOREG converter is warm. The following conditions are applicable:

    • Temperature changes of ±10 °K
    • Line voltage changes corresponding to +10 % / -5 % of the rated input voltage
    • Temperature coefficient of temperature-compensated tacho-generators 0.15 % per 10 °K (applies only to analog tacho-generator)
    • Constant setpoint (14-bit resolution)

3) Not for converters with 690 V and 950 V rated voltage

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