4.10 Underexcitation (Loss-of-Field) Protection (ANSI 40)
423
7UM62 Manual
C53000-G1176-C149-3
4.10
Underexcitation (Loss-of-Field) Protection (ANSI 40)
Setting Ranges/
Resolutions
Conductance Sections
1/xd CHAR.
0.25 to 3.00
(Increments 0.01)
Angle of Inclination
α
1,
α
2,
α
3
50° to 120°
(Increments 1°)
Delay Time
T
0.00 s to 60.00 s
(Increments 0.01 s)
or
∞
(does not expire)
Undervoltage Lock-Out
10.0 V to 125.0 V (Increments 0.1 V)
Excitation Voltage
Uexc. <
0.50 V to 8.00 V
(Increments 0.01 V)
(via external upstream voltage divider)
Inherent Operating
Times
Pickup Times
– Stator Criterion
1/xd CHAR.,
α
Approx. 60 ms
– Rotor Criterion
Uexc.
Approx. 60 ms
– Undervoltage Lock-Out U
1
<
Approx. 50 ms
Dropout
– Stator Criterion
1/xd CHAR.,
α
Approx. 0.95
– Rotor Criterion
Uexc.
Approx. 1.05 or + 0.5 V
– Undervoltage Lock-Out U
1
<
Approx. 1.1
Tolerances
– Stator Criterion
1/xd CHAR.
3 % of setting value
– Stator Criterion
α
1° electrical
– Rotor Criterion
Uexc.
1° or 0.1 V
– Undervoltage Lock-Out U
1
<
1 % of setting value or 0.5 V
– Delay Times
T
1 % of setting value or 10 ms
Influencing
Variables for
Pickup
Power Supply Direct Voltage in Range
0.8
≤
U
PS
/ U
PS nominal
≤
1.15
1 %
Temperature in Range
23 °F
≤ ϑ
amb
≤
131 °F
0.3 % / 10 °F
–5 °C
≤ ϑ
amb
≤
55 °C
0.5 % / 10 K
Frequency in Range
0.95
≤
f/f
N
≤
1.05
1 %
Harmonic Currents
– Up to 10 % 3rd Harmonics
1 %
– Up to 10 % 5th Harmonics
1 %
