69
SIEMENS AG 6RX1700-0AD76
9-35
SIMOREG DC-MASTER Operating Instructions
9.15.2 Configuring for dynamic overload capability
Section 9.15.3 provides the following information for each converter model:
− Maximum overload period
t
an
for starting with cold power section and specified constant overload
with an overload factor of X (i.e. loading with X times the converter rated DC current * P077) (see
small table at top right)
− Maximum current interval
t
ab
(maximum cooling time) until the power section reaches the "cold"
state (see below small table at top right)
− Limit characteristics fields for calculating overload capability
in thermally settled, intermittent
overload operation (periodic load cycles).
(In tabulated form: Top left
As curve with logarithmic y axis: Curve at bottom left
As curve with linear y axis: Curve at bottom right)
Important
:
The power section is in the "cold" state when the calculated thyristor temperature corresponds to less
than 5 % of its maximum permissible value. This state can be scanned via a binary selectable output.
Note:
If load cycles are started with a cold power section at least slightly within the specified load cycle
limits, then the thermally settled state can be reached without tripping the I2t monitor.
If the I2t monitoring function is parameterized for a shutdown response (P075 = 2), the converter
should not be allowed to operate too close to the limit characteristic when periodic load cycles are
configured with a load cycle time of longer or slightly shorter or equal to 300 s.
In all other cases, and especially when parameterizing reduction of the armature current setpoint
(P075 = 1) as the I2t monitoring trip response, it is possible to fully utilize the maximum overload
capability defined by the limit characteristic.
Structure of limit characteristics fields for intermittent overload duty:
Each characteristics field refers to a load cycle of intermittent overload operation with a total period
of
300 s.
This type of load cycle consists of two periods,
i.e. the base-load duty period
(armature actual current ≤ P077 * converter rated DC current)
and the overload period
(actual armature current ≥ P077 * converter rated DC current).
Each limit characteristic displays the maximum permissible overload period Tp
over
the maximum base-load current Ig
for a specific overload factor X
for each converter model.
For the remainder
of the load cycle, the current may not exceed the base-load current
as defined by
the overload factor.
If no limit characteristic is specified for a particular overload factor, then the characteristic for the next-
higher overload factor must be applied.
The limit characteristics fields apply to a load cycle time of 300s.
For load cycle times of < 300s, the overload period must be reduced proportionally (load cycle/300s).
For load cycle times of > 300s, the overload period is the same as that for a cycle time of 300s, but the
base-load period is correspondingly longer.
The limit characteristics fields apply for a setting of P077 = 1.00. If P077 is set to ≤ 1.00, i.e. in the
case of thermal derating, the currents which actually flow must be weighted with a factor of 1/P077:
Overload factor X for characteristic =
Actual overload current
P
converter rated DC current
077 *
Actual maximum base-load current =
P077 * max. base-load current acc. to character-
istic in % of converter rated DC current
77
9-36
SIEMENS AG 6RX1700-0AD76
SIMOREG DC-MASTER Operating Instructions
Basic tasks for configuring periodic overload operation
Terms:
Base-load duty period
300
= min. base-load duty period for 300 s cycle time
Overload period
300
= max. overload period for 300 s cycle time
Basic task 1:
Known quantities: Converter type, cycle time, overload factor, overload period
Quantities to be found: Minimum base-load duty period and maximum base-load current
Solution:
Selection of limit characteristic for specified converter type and overload factor
Cycle time < 300s: Overload period
300
= (300s/cycle time) * overload period
Cycle time ≥ 300s: Overload period
300
= Overload period
If: Overload period
300
> overload period
300
for base-load current = 0
Then: Required load cycle cannot be configured,
Otherwise: Determine the maximum base-load current for overload period
300
from the
limit characteristic
Example 1:
Known quantities: 30A/4Q converter; cycle time 113.2s; overload factor = 1.45; overload period = 20s
Quantities to be found: Minimum base-load period and maximum base-load current
Solution:
Limit characteristic for 30A/4Q converter, overload factor 1.5
Overload period
300
= (300s/113.2s) * 20s = 53s
Base-load period
300
= 300s – 53s = 247s →
Maximum base-load current = approx. 45% of I
rated
= 13.5A
Basic task 2:
Known quantities: Converter type, cycle time, overload factor, base-load current
Quantities to be found: Minimum base-load period and maximum overload period
Solution:
Selection of limit characteristic for specified converter type and overload factor
Determine overload period
300
for base-load current from limit characteristic
Cycle time < 300s:
Max. overload period = (cycle time/300s) * overload period
300
Min. base-load period = cycle time – max. overload period
Cycle time ≥ 300s:
Max. overload period = overload period
300
Min. base-load period = cycle time – max. overload period
Example 2:
Known quantities: 30A/4Q converter; cycle time 140s; current overload factor = 1.15;
base-load current = 0.6*I
rated
= 18A
Quantities to be found: Minimum base-load period and maximum overload period
Solution:
Limit characteristic for 30A/4Q converter, overload factor 1.2
Base-load current = 60% of I
rated
→ overload period
300
= 126.35s
Max. overload period = (140s/300s) * 126.35s = approx. 58s
Min. base-load period = 140s – 58s = 82s
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132
SIEMENS AG 6RX1700-0AD76
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SIMOREG DC-MASTER Operating Instructions
9.15.3 Characteristics for determining the dynamic overload capability for intermittent
overload operation
6RA7013-6DV62
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Ig (%) X=1.8
X=1.5
X=1.4
X=1.3
X=1.2
X=1.1
0 95.420 152.660 179.100 211.080 250.440
300.000
10 88.298 145.785 172.818 205.833 247.077
300.000
20 80.245 137.837 165.438 199.620 243.106
300.000
30 71.148 128.570 156.707 192.183 238.150
300.000
40 60.760 117.657 146.280 183.060 231.964 300.000
X
t
an
(s)
50 48.911 104.704 133.676 171.763 224.061
300.000
1.1
∞
60 35.280 89.040 118.105 157.453 213.554
300.000
1.2
1633
70 19.600 69.916
98.440 138.528 199.098
300.000
1.3
1112
80
5.512 46.107
72.987 112.909 177.737
300.000
1.4
833
90
0.838 15.990
38.903
76.140 143.360
300.000
1.5
651
94
0.670
5.590
22.080
56.520 120.320
300.000
1.8
382
98
0.503
2.651
8.750
31.800
93.013
300.000
100
0.419
1.182
2.085
19.440
79.360
300.000
t
ab
(s) = 2281
6RA7013-6DV62 15A/400V
0,1
1,0
10,0
100,0
1000,0
0
10
20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
6RA7013-6DV62 15A/400V
0
50
100
150
200
250
300
0
10
20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
150
9-38
SIEMENS AG 6RX1700-0AD76
SIMOREG DC-MASTER Operating Instructions
6RA7018-6DS22 and 6RA7018-6FS22.
6RA7018-6DV62 and 6RA7018-6FV62
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Ig (%) X=1.8
X=1.5
X=1.4
X=1.3
X=1.2
X=1.1
0 45.520 97.480 122.400 153.020 191.300
240.300
10 39.447 90.410 115.380 146.357 185.582
236.594
20 32.616 82.061 106.977 138.295 178.589
231.970
30 25.093 72.179
96.909 128.483 169.899
226.113
40 17.093 60.500
84.768 116.423 158.923
218.466
X
t
an
(s)
50
9.069 46.750
70.012 101.402 144.877
208.253
1.1
1439
60
2.993 30.889
51.992
82.375 126.350
194.047
1.2
906
70
0.466 13.944
30.536
57.809 101.038
173.048
1.3
631
80
0.314
1.750
8.127
26.755
64.820
139.207
1.4
456
90
0.162
0.554
0.880
1.491
14.255
76.260
1.5
333
94
0.101
0.346
0.550
0.932
1.758
34.440
1.8
123
98
0.041
0.138
0.220
0.373
0.703
11.787
100
0.010
0.035
0.055
0.093
0.176
0.460
t
ab
(s) = 2169
6RA7018-6DS22 30A/1Q 400V
6RA7018-6FS22 30A/1Q 460V
6RA7018-6DV62 30A/4Q 400V
6RA7018-6FV62 30A/4Q 460V
0,1
1,0
10,0
100,0
1000,0
0
10
20
30 40
50 60
70
80 90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
6RA7018-6DS22 30A/1Q 400V
6RA7018-6FS22 30A/1Q 460V
6RA7018-6DV62 30A/4Q 400V
6RA7018-6FV62 30A/4Q 460V
0
50
100
150
200
250
300
0
10
20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
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143
SIEMENS AG 6RX1700-0AD76
9-39
SIMOREG DC-MASTER Operating Instructions
6RA7025-6DS22. 6RA7025-6FS22 and 6RA7025-6GS22
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Ig (%) X=1.8
X=1.5
X=1.4
X=1.3
X=1.2
X=1.1
0 70.600 122.800 146.660 175.280 210.100
253.320
10 63.372 115.270 139.406 168.624 204.640
250.030
20 55.152 106.462 131.198 160.650 198.004
245.968
30 45.796 96.080 120.544 151.002 189.831
240.862
40 35.187 83.785 108.182 139.149 179.545 234.267
X
t
an
(s)
50 23.257 69.086
93.111 124.364 166.345
225.415
1.1
2071
60 10.164 51.369
74.442 105.480 148.834
213.073
1.2
1352
70
2.022 30.087
51.000
80.716 124.642
194.690
1.3
988
80
0.620
6.095
21.643
47.267
89.280
164.645
1.4
756
90
0.330
0.876
1.097
4.671
33.840
106.744
1.5
592
94
0.213
0.568
0.711
1.362
5.483
65.650
1.8
296
98
0.097
0.259
0.324
0.621
2.083
22.677
100
0.039
0.104
0.131
0.250
0.383
1.190
t
ab
(s) = 2169
6RA7025-6DS22 60A/1Q 400V
6RA7025-6FS22 60A/1Q 460V
6RA7025-6GS22 60A/1Q 575V
0,1
1,0
10,0
100,0
1000,0
0
10
20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
6RA7025-6DS22 60A/1Q 400V
6RA7025-6FS22 60A/1Q 460V
6RA7025-6GS22 60A/1Q 575V
0
50
100
150
200
250
300
0
10 20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
140
9-40
SIEMENS AG 6RX1700-0AD76
SIMOREG DC-MASTER Operating Instructions
6RA7025-6DV62. 6RA7025-6FV62 and 6RA7025-6GV62
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Ig (%) X=1.8
X=1.5
X=1.4
X=1.3
X=1.2
X=1.1
0 72.980 130.400 156.740 188.460 227.300
275.940
10 65.811 123.227 149.957 182.498 222.876
274.175
20 57.585 114.814 141.930 175.350 217.469
272.034
30 48.150 104.895 132.360 166.711 210.816
269.379
40 37.259 93.130 120.832 156.101 202.443
265.933
X
t
an
(s)
50 24.678 79.007 106.735 142.839 191.669
261.301
1.1
2535
60 10.683 61.827
89.233 125.906 177.370
254.787
1.2
1446
70
2.634 40.555
66.989 103.596 157.563
245.064
1.3
1016
80
0.716 14.001
37.903
72.993 128.433
228.970
1.4
761
90
0.439
1.241
4.225
28.730
81.603
197.474
1.5
587
94
0.328
0.927
1.420
7.154
53.876
174.472
1.8
283
98
0.217
0.614
0.940
3.179
20.823
130.537
100
0.162
0.457
0.700
1.191
4.296
108.570
t
ab
(s) = 2522
6RA7025-6DV62 60A/4Q 400V
6RA7025-6FV62 60A/4Q 460V
6RA7025-6GV62 60A/4Q 575V
0,1
1,0
10,0
100,0
1000,0
0
10
20
30 40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
6RA7025-6DV62 60A/4Q 400V
6RA7025-6FV62 60A/4Q 460V
6RA7025-6GV62 60A/4Q 575V
0
50
100
150
200
250
300
0
10
20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
151
SIEMENS AG 6RX1700-0AD76
9-41
SIMOREG DC-MASTER Operating Instructions
6RA7028-6DS22 and 6RA7028-6FS22
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Ig (%) X=1.8
X=1.5
X=1.4
X=1.3
X=1.2
X=1.1
0 44.040 99.800 126.140 157.960 196.940
245.560
10 36.508 91.356 117.870 150.323 190.607
241.690
20 28.138 81.553 108.144 141.179 182.942
236.930
30 18.933 70.135
96.619 130.216 173.518
230.885
40
9.535 56.833
82.883 116.804 161.716
223.119
X
t
an
(s)
50
3.430 41.356
66.380 100.170 146.594
212.760
1.1
1879
60
1.190 23.503
46.481
79.223 126.664
198.343
1.2
1186
70
0.432
5.814
22.736
52.448
99.405
176.957
1.3
831
80
0.293
0.954
2.778
18.590
60.445
142.178
1.4
604
90
0.154
0.502
0.790
1.309
6.765
76.545
1.5
443
94
0.099
0.321
0.506
0.837
1.579
32.480
1.8
151
98
0.043
0.141
0.221
0.366
0.691
11.259
100
0.015
0.050
0.079
0.131
0.247
0.648
t
ab
(s) = 2668
6RA7028-6DS22 90A/1Q 400V
6RA7028-6FS22 90A/1Q 460V
0,1
1,0
10,0
100,0
1000,0
0
10
20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
6RA7028-6DS22 90A/1Q 400V
6RA7028-6FS22 90A/1Q 460V
0
50
100
150
200
250
300
0
10
20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
141
9-42
SIEMENS AG 6RX1700-0AD76
SIMOREG DC-MASTER Operating Instructions
6RA7028-6DV62 and 6RA7028-6FV62
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Ig (%) X=1.8
X=1.5
X=1.4
X=1.3
X=1.2
X=1.1
0 94.460 141.260 162.280 187.240 217.380
254.460
10 86.466 133.232 154.580 180.222 211.582
250.787
20 77.462 123.966 145.592 171.911 204.624
246.336
30 67.269 113.195 135.009 161.976 196.128
240.743
40 55.667 100.540 122.390 149.907 185.555
233.598
X
t
an
(s)
50 42.361 85.483 107.108 134.954 172.084
224.091
1.1
1911
60 27.004 67.315
88.261 115.992 154.347
210.906
1.2
1320
70
9.972 44.985
64.499
91.200 129.983
191.381
1.3
1007
80
1.781 17.079
33.595
57.466
94.473
159.668
1.4
804
90
0.581
1.302
2.533
9.867
37.987
99.089
1.5
659
94
0.354
0.792
1.108
1.680
7.117
56.044
1.8
391
98
0.126
0.283
0.396
0.600
2.441
18.841
100
0.013
0.028
0.040
0.060
0.103
0.239
t
ab
(s) = 2658
6RA7028-6DV62 90A/4Q 400V
6RA7028-6FV62 90A/4Q 460V
0,1
1,0
10,0
100,0
1000,0
0
10
20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
6RA7028-6DV62 90A/4Q 400V
6RA7028-6FV62 90A/4Q 460V
0
50
100
150
200
250
300
0
10
20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
146
SIEMENS AG 6RX1700-0AD76
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SIMOREG DC-MASTER Operating Instructions
6RA7031-6DS22. 6RA7031-6FS22 and 6RA7031-6GS22
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Ig (%) X=1.8
X=1.5
X=1.4
X=1.3
X=1.2
X=1.1
0 71.160 122.540 146.140 174.380 208.680
251.080
10 63.409 114.371 138.230 167.128 202.695
247.413
20 54.716 104.905 128.959 158.516 195.483
242.887
30 45.000 93.880 118.003 148.165 186.653
237.226
40 34.184 80.975 104.942 135.556 175.626 229.911
X
t
an
(s)
50 22.239 65.756
89.153 119.928 161.525
220.178
1.1
1994
60
9.830 47.787
69.886 100.161 142.928
206.664
1.2
1318
70
2.269 26.730
46.225
74.573 117.429
186.607
1.3
968
80
0.655
5.378
17.613
40.970
80.571
153.963
1.4
743
90
0.340
0.863
1.270
3.395
25.315
91.948
1.5
582
94
0.214
0.544
0.799
1.258
3.159
49.218
1.8
289
98
0.088
0.224
0.329
0.518
1.231
16.851
100
0.025
0.064
0.094
0.148
0.267
0.667
t
ab
(s) = 3110
6RA7031-6DS22 125A/1Q 400V
6RA7031-6FS22 125A/1Q 460V
6RA7031-6GS22 125A/1Q 575V
0,1
1,0
10,0
100,0
1000,0
0
10
20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
6RA7031-6DS22 125A/1Q 400V
6RA7031-6FS22 125A/1Q 460V
6RA7031-6GS22 125A/1Q 575V
0
50
100
150
200
250
300
0
10
20
30
40
50
60
70
80
90
100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
147
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SIEMENS AG 6RX1700-0AD76
SIMOREG DC-MASTER Operating Instructions
6RA7031-6DV62. 6RA7031-6FV62 and 6RA7031-6GV62
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Tp (s)
Ig (%) X=1.8
X=1.5
X=1.4
X=1.3
X=1.2
X=1.1
0 74.560 125.660 148.680 176.040 209.100
249.760
10 66.512 117.485 140.799 168.832 203.128
245.972
20 57.377 107.974 131.548 160.259 195.896
241.303
30 46.984 95.363 120.584 149.925 187.042
235.487
40 35.141 83.679 107.433 137.311 175.983
227.952
X
t
an
(s)
50 21.702 67.946
91.425 121.613 161.810
217.919
1.1
2160
60
6.944 48.910
71.581 101.600 143.079
203.951
1.2
1453
70
1.340 25.670
46.462
75.329 117.208
183.226
1.3
1079
80
0.603
2.501
14.468
39.467
79.328
149.404
1.4
836
90
0.304
0.749
1.080
1.686
19.379
84.405
1.5
662
94
0.184
0.454
0.655
1.022
1.811
38.066
1.8
344
98
0.065
0.159
0.230
0.358
0.635
12.764
100
0.005
0.012
0.017
0.027
0.047
0.113
t
ab
(s) = 3112
6RA7031-6DV62 125A/4Q 400V
6RA7031-6FV62 125A/4Q 460V
6RA7031-6GV62 125A/4Q 575V
0,1
1,0
10,0
100,0
1000,0
0
10
20
30
40
50
60
70
80
90
100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
6RA7031-6DV62 125A/4Q 400V
6RA7031-6FV62 125A/4Q 460V
6RA7031-6GV62 125A/4Q 575V
0
50
100
150
200
250
300
0
10
20
30
40
50
60
70
80
90 100
Base-load current as % of rated DC current
Overload period in s with cycle time of 300s
X=1,8
X=1,5
X=1,4
X=1,3
X=1,2
X=1,1
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