GE M60 Instruction Manual page 289
Motor protection system
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CHAPTER 5: SETTINGS
IEC. The selected curve can also serve as a base for a voltage dependent overload curve if the
setting is "Enabled." The algorithm uses memory in the form of a register called Thermal Capacity Used. This
FUNCTION
register is updated every power cycle using the following equation:
where time_to_trip represents the time coordinate on the time-current overload curve, corresponding to the equivalent
motor current detected within any power cycle period of motor overload. 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 Standard Motor Curves figure and Standard Curve Multipliers table that follow). The pickup level for the "Motor" curve is
calculated as
MOTOR OVERLOAD FACTOR
(FLA) setting can be found in the
AMPS
Table 5-21: Curve multipliers
Pickup
M60 standard curve multipliers
level
x1
x2
x3
1.01
4353.6 8707.2 13061 17414 21768 26122 30475 34829 39183 43536 47890 52243 56597 60951 65304
1.05
853.71 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
42.41
84.83
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
2.00
29.16
58.32
87.47
2.25
21.53
43.06
64.59
2.50
16.66
33.32
49.98
2.75
13.33
26.65
39.98
3.00
10.93
21.86
32.80
3.25
9.15
18.29
27.44
3.50
7.77
15.55
23.32
3.75
6.69
13.39
20.08
4.00
5.83
11.66
17.49
4.25
5.12
10.25
15.37
4.50
4.54
9.08
13.63
4.75
4.06
8.11
12.17
5.00
3.64
7.29
10.93
5.50
2.99
5.98
8.97
6.00
2.50
5.00
7.49
6.50
2.12
4.24
6.36
7.00
1.82
3.64
5.46
7.50
1.58
3.16
4.75
8.00
1.39
2.78
4.16
10.00
1.39
2.78
4.16
15.00
1.39
2.78
4.16
20.00
1.39
2.78
4.16
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
1 f (in ms)
--------------------------- -
TC
=
TC
+
used t
used (t – 1)
time_to_trip
setting (OF) times the
SYSTEM SETUP MOTOR
x4
x5
x6
x7
116.63 145.79 174.95 204.11 233.26 262.42 291.58 320.74 349.90 379.05 408.21 437.37
86.12
107.65 129.18 150.72 172.25 193.78 215.31 236.84 258.37 279.90 301.43 322.96
66.64
83.30
99.96
116.62 133.28 149.94 166.60 183.26 199.92 216.58 233.24 249.90
53.31
66.64
79.96
93.29
43.73
54.66
65.59
76.52
36.58
45.73
54.87
64.02
31.09
38.87
46.64
54.41
26.78
33.47
40.17
46.86
23.32
29.15
34.98
40.81
20.50
25.62
30.75
35.87
18.17
22.71
27.25
31.80
16.22
20.28
24.33
28.39
14.57
18.22
21.86
25.50
11.96
14.95
17.94
20.93
9.99
12.49
14.99
17.49
8.48
10.60
12.72
14.84
7.29
9.11
10.93
12.75
6.33
7.91
9.49
11.08
5.55
6.94
8.33
9.71
5.55
6.94
8.33
9.71
5.55
6.94
8.33
9.71
5.55
6.94
8.33
9.71
100%
setting (FLA). The
MOTOR FULL LOAD AMPS
menu.
x8
x9
x10
x11
106.62 119.95 133.27 146.60 159.93 173.25 186.58 199.91
87.46
98.39
109.32 120.25 131.19 142.12 153.05 163.98
73.16
82.31
91.46
100.60 109.75 118.89 128.04 137.18
62.19
69.96
77.73
85.51
53.56
60.25
66.95
73.64
46.64
52.47
58.30
64.13
41.00
46.12
51.25
56.37
36.34
40.88
45.42
49.97
32.44
36.50
40.55
44.61
29.15
32.79
36.43
40.08
23.91
26.90
29.89
32.88
19.99
22.48
24.98
27.48
16.96
19.08
21.20
23.32
14.57
16.39
18.21
20.04
12.66
14.24
15.82
17.41
11.10
12.49
13.88
15.27
11.10
12.49
13.88
15.27
11.10
12.49
13.88
15.27
11.10
12.49
13.88
15.27
GROUPED ELEMENTS
VOLTAGE DEPENDENT
Eq. 5-7
MOTOR FULL LOAD
x12
x13
x14
x15
93.28
101.05 108.83 116.60
80.34
87.03
93.73
100.42
69.96
75.79
81.62
87.45
61.50
66.62
71.75
76.87
54.51
59.05
63.59
68.14
48.66
52.72
56.77
60.83
43.72
47.36
51.01
54.65
35.87
38.86
41.85
44.84
29.98
32.48
34.97
37.47
25.44
27.55
29.67
31.79
21.86
23.68
25.50
27.32
18.99
20.57
22.15
23.74
16.65
18.04
19.43
20.82
16.65
18.04
19.43
20.82
16.65
18.04
19.43
20.82
16.65
18.04
19.43
20.82
5-161
5
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