Capacitor disconnection
Operating instructions RHF
79
ELTROPLAN
-
REVCON
Elektrotechnische Anlagen GmbH
To reduce this reactive current and to prevent an overcompensation of the mains it
is recommended to disconnect this reactive current at standby operation. This re-
active current can be disconnected by a contactor which must replace the short
circuit wires between terminals X3 and X4 . Depending on the short-circuit power
in the most industrial mains supplies a commercial AC3 contactor can be used for
the disconnection.
The power of the AC3 contactor should be minimum 50%
of the nominal power of the filter.
This contactor can be connected and discon-
nected, depending on the drive performance, to a load of maximal 30%.
Wait 25 seconds before restarting until the capacitors are discharged completely.
To ensure dynamic cycles of operation the C-disconnection may be done with
special capacitor contactors. In this case the connection of the capacitors may
be done to a maximal power of 30% without holding time!
For drives operating on generators (e.g. ship applications) capacitor contactors are
recommended in general.
Table 46 shows the nominal power of the contactor depending on the nominal cur-
rent:
Nominal current
380-415 V 50,60 Hz
[A]
Nominal current
440-480 V 60 Hz
[A]
Contactor
Nominal power
[kvar]
Nominal current
500-690V 50,60 Hz
[A]
Contactor
Nominal power
[kvar]
6
-
1
-
-
10
10
1
15
5
14
14
2
20
6
22
19
4
24
9
29
25
6
29
10
35
31
7
36
13
43
36
7
50
17
58
48
9
58
19
72
60
11
77
24
86
73
15
87
28
101
95
17
109
34
144
118
22
128
48
180
154
29
155
48
217
183
36
197
62
252
231
44
240
68
304
291
51
296
95
325
355
58
366
109
380
380
66
395
123
433
436
88
Table 45: The nominal power of the contactor