
34
R E M 61 5 A N S I 5.0 FP1
M OTO R P R OT EC T I O N A N D CO N T R O L
—
Table 44. Negative-sequence overcurrent protection for machines (MNSPTOC)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±1.5% of the set value or ±0.002 x I
n
Start time
(1), (2)
Minimum
Typical
Maximum
I
Fault
= 2.0 x set Start value
23 ms
26 ms
28 ms
Reset time
Typically 40 ms
Reset ratio
Typically 0.96
Retardation time
< 35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Operate time accuracy in inverse time mode
±5.0% of the theoretical value or ±20 ms
(3)
Suppression of harmonics
DFT: -50dB at f = n x f
n
, where n = 2, 3, 4, 5,…
1 Negative-sequence current before = 0.0, fn = 50 Hz, results based on statistical distribution of 1000 measurements
2 Includes the delay of the signal output contact
3 Start value multiples in range of 1.10...5.00
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Table 45. Negative-sequence overcurrent protection for machines (MNSPTOC) main settings
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Table 47. Loss of load supervision (LOFLPTUC) main settings
—
Table 46. Loss of load supervision (LOFLPTUC)
Parameter
Function
Value (range)
Step
Start value
MNSPTOC
0.01...0.50 × I
n
0.01
Operating curve type
MNSPTOC
Definite or inverse time
Curve type: 5, 15, 17, 18
Operate delay time
MNSPTOC
100...120000 ms
10
Operation
1 = on
5 = off
—
Cooling time
MNSPTOC
5...7200 s
1
Parameter
Function
Value (range)
Step
Start value low
LOFLPTUC
0.01...0.50 × I
n
0.01
Start value high
LOFLPTUC
0.01...1.00 × I
n
0.01
Operate delay time
LOFLPTUC
400...600000 ms
10
Operation
LOFLPTUC
1 = on
5 = off
—
Characteristc
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±2 Hz
±1.5% of the set value or ±0.002 × I
n
Start time
Typically 300 ms
Reset time
Typically 40 ms
Reset ratio
Typically 1.04
Retardation time
<35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms