Accessories
147
3ADW000462R0401 DCS880 Hardware manual e d
DCF505 / DCF506 Overvoltage Protection
Certain converter modules sizes H1 ... H4 can be used as motor field supply. This operation needs separate active
overvoltage protection DCF505 or DCF506. They protect the power part against inadmissibly high voltages.
The overvoltage protection activates a free-wheeling circuit between connectors F+ and F- if an overvoltage occurs. The
DCF505 / 506 consists of a trigger unit (SDCS-FEP-x) and a
free-wheeling thyristor (two anti-parallel thyristors in a
DCF506). To connect, use the same size wire as the field exciter.
The DCF506 consists of a relay output to indicate a free-wheeling condition to the field converter. When the free-wheeling
function is triggered, it will last until the DC current is less than 0.5 A. During this time the relay conta cts are closed.
Assignment field supply converter, overvoltage protection and cross-sectional areas
Only these converter types are allowed to be used as large field exciters. A 10 % current de-rating is strongly
recommended.
Limited to 520 A
DC
field current due to the overvoltage protection.
The overvoltage protection DCF505 is suitable for 2-Q
units DCS880-S01 with simple non-motoric inductive
load.
Simple inductive load connected to a DCS880-S01
and 2-Q overvoltage protection DCF505.
For motor field supply from DCS880-S01 (2-Q) or
DCS880-S02 (4-Q) the overvoltage protection DCF506 is
always required.
Motor field supply with DCS880-S0x and 4-Q overvoltage
protection DCF506.
Large field exciters for
motor fields
Size Overvoltage Protection Cross-sectional areas
[mm²]
[Nm]
X4
DCF505
DCF506
Flex cable
0.25 ... 1.5
0.5 ... 0.6
2-Q, 400 V / 500 V (IEC) / 525 V (UL)
DCS880-S01-0020-04/05
H1
DCF506-0140-51
1 x 4 1 x M8 13
DCS880-S01-0045-04/05
DCS880-S01-0065-04/05
DCS880-S01-0090-04/05
DCS880-S01-0135-04/05
H2
DCF506-0520-51 1 x 10 1 x M8 13
DCS880-S01-0180-04/05
DCS880-S01-0225-04/05
DCS880-S01-0270-04/05
DCS880-S01-0315-04/05
H3
DCS880-S01-0405-04/05
DCS880-S01-0610-04/05 H4
4-Q, 400 V / 500 V (IEC) / 525 V (UL)
DCS880-S02-0025-04/05
H1 DCF506-0140-51 1 x 4 1 x M8 13
DCS880-S02-0050-04/05
DCS880-S02-0075-04/05
DCS880-S02-0100-04/05
DC
S880-S02-0150-04/05
H2
DCF506-0520-51 1 x 10 1 x M8 13
DCS880-S02-0200-04/05
DCS880-S02-0250-04/05
DCS880-S02-0300-04/05
DCS880-S02-0350-04/05
H3
DCS880-S02-0450-04/05
DCS880-S02-0680-04/05 H4
C1(+)
D1(-)
DCF505
X11
X12
SF_800_001_DCF_a.ai
DCS880-S01
Large field exciter Overvoltage protection
M
DCF506
X6:2 9
X4:1 2
C1(+)
D1(-)
X11
X12
SF_800_001_DCF_a.ai
DCS880-S0x
Overvoltage protectionLarge field exciter
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