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CHAPTER 4: SETPOINTS
Table 4-18: Pickup Level vs. Standard "Motor" Curve TD Multipliers
Pickup
869 STANDARD "Motor" Curve TD MULTIPLIERS
Level
x 1
x 2
1.01
4353.6 8707.2 13061 17414 21768 26122 30475 34829 39183 43536 47890 52243 56597 60951 65304
1.05
853.7
1707.4 2561.1 3414.9 4268.6 5122.3 5976.0 6829.7 7683.4 8537.1 9390.8 10245 11098 11952 12806
1.10
416.68 833.36 1250.0 1666.7 2083.4 2500.1 2916.8 3333.5 3750.1 4166.8 4583.5 5000.2 5416.9 5833.6 6250.2
1.20
198.86 397.72 596.58 795.44 994.30 1193.2 1392.0 1590.9 1789.7 1988.6 2187.5 2386.3 2585.2 2784.1 2982.9
1.30
126.80 253.61 380.41 507.22 634.02 760.82 887.63 1014.4 1141.2 1268.0 1394.8 1521.6 1648.5 1775.3 1902.1
1.40
91.14
182.27 273.41 364.55 455.68 546.82 637.96 729.09 820.23 911.37 1002.5 1093.6 1184.8 1275.9 1367.0
1.50
69.99
139.98 209.97 279.96 349.95 419.94 489.93 559.92 629.91 699.90 769.89 839.88 909.87 979.86 1049.9
1.75
42.42
84.83
2.00
29.16
58.32
2.25
21.53
43.06
2.50
16.66
33.32
2.75
13.33
26.66
3.00
10.93
21.86
3.25
9.15
18.29
3.50
7.77
15.55
3.75
6.69
13.39
4.00
5.83
11.66
4.25
5.13
10.25
4.50
4.54
9.09
4.75
4.06
8.11
5.00
3.64
7.29
5.50
2.99
5.98
6.00
2.50
5.00
6.50
2.12
4.24
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Voltage Dependent Function setting is "Enabled". The algorithm uses memory in the form
of a register called Thermal Capacity Used. This register is updated every power cycle
using the following equation:
Where
t
— represents the time coordinate on the time-current overload curve,
trip
corresponding to the equivalent motor current detected within any power cycle period
of motor overload. In text, it is also specified as time to trip.
T
— represents the period in seconds corresponding to the nominal power system
system
frequency.
Always set the overload curve slightly lower than the thermal limits provided by the
motor manufacturer. This ensures that the motor is tripped before the thermal limit is
reached.
The "Motor" curve is based on typical motor thermal limit curves and is normally used
for standard motor applications (see the following Standard Motor Curves figure and
Standard TD Multipliers table). The pickup level for the "Motor" curve is calculated as
Motor Overload Factor setting (OL) times the Motor Full Load Amps setting (FLA). The
Motor Full Load Amps (FLA) setting can be found in the
menu.The IEC motor curve is described in the IEC Curve k Factor setting.
x 3
x 4
x 5
x 6
127.24 169.66 212.07 254.49 296.90 339.32 381.73 424.15 466.56 508.98 551.39 593.81 636.22
87.47
116.63 145.79 174.95 204.11 233.26 262.42 291.58 320.74 349.90 379.05 408.21 437.37
64.59
86.12
107.65 129.18 150.72 172.25 193.78 215.31 236.84 258.37 279.90 301.43 322.96
49.98
66.64
83.30
99.96
39.98
53.31
66.64
79.96
32.80
43.73
54.66
65.59
27.44
36.58
45.73
54.87
23.32
31.09
38.87
46.64
20.08
26.78
33.47
40.17
17.49
23.32
29.15
34.98
15.38
20.50
25.63
30.75
13.63
18.17
22.71
27.26
12.17
16.22
20.28
24.33
10.93
14.57
18.22
21.86
8.97
11.96
14.95
17.94
7.49
9.99
12.49
14.99
6.36
8.48
10.60
12.72
x 7
x 8
x 9
x 10
116.62 133.28 149.94 166.60 183.26 199.92 216.58 233.24 249.90
93.29
106.62 119.95 133.27 146.60 159.93 173.25 186.58 199.91
76.53
87.46
98.39
109.32 120.25 131.19 142.12 153.05 163.98
64.02
73.16
82.31
91.46
54.41
62.19
69.96
77.73
46.86
53.56
60.25
66.95
40.81
46.64
52.47
58.30
35.88
41.00
46.13
51.25
31.80
36.34
40.88
45.43
28.39
32.44
36.50
40.55
25.50
29.15
32.79
36.43
20.93
23.91
26.90
29.89
17.49
19.99
22.48
24.98
14.84
16.96
19.08
21.20
PROTECTION
Setpoints > System > Motor
x 11
x 12
x 13
x 14
100.60 109.75 118.89 128.04 137.18
85.51
93.28
101.05 108.83 116.60
73.64
80.34
87.03
93.73
64.13
69.96
75.79
81.62
56.38
61.50
66.63
71.75
49.97
54.51
59.05
63.60
44.61
48.66
52.72
56.77
40.08
43.72
47.36
51.01
32.88
35.87
38.86
41.85
27.48
29.98
32.48
34.97
23.32
25.44
27.56
29.67
Eq. 9
x 15
100.42
87.45
76.88
68.14
60.83
54.65
44.84
37.47
31.79
4–113
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