4 Technical Data
328
7UM61 Manual
C53000-G1176-C127-3
4.14 Rate-of-Frequency-Change Protection df/dt (ANSI 81R)
Setting Ranges / Increments
Times
Dropout Ratios
Tolerances
Influencing Variables for Pickup Values
Stages, can be +df/dt> or –df/dt 4
Pickup values df/dt 0.1 to 10 Hz/s Increments 0.1 Hz/s
Delay times T 0.00 to 60.00 s Increments 0.01 s
or ineffective
Undervoltage Blocking U1> 10.0 to 125.0 V Increments 0.1 V
Window Length 1 to 25 cycles
Pickup Times df/dt Approx. 150 ms to 500 ms
(dep. on window length)
Dropout Times df/dt approx. 150 ms to 500 ms
(dep. on window length)
Dropout Difference ∆f/dt 0.02 to 0.99 Hz/s (settable)
Dropout Ratio approx. 1.05
Frequency Rise
–Measuring Window < 5 approx. 5 % or 0.15 Hz/s at U > 0.5 U
N
– Measuring Window ≥ 5 approx. 3 % or 0.1 Hz/s at U > 0.5 U
N
Undervoltage Blocking 1 % of setting value or 0.5 V
Delay Times 1 % or 10 ms
Power Supply DC Voltage in Range
0.8 ≤ U
PS
/U
PSN
≤ 1.15
≤ 1 %
Temperature in Range
23°F or –5 °C ≤ Θ
amb
≤ 131°F or 55 °C
≤ 0.5 % / 10 K
Harmonics
- Up to 10 % 3rd harmonic
- Up to 10 % 5th harmonic
≤ 1 %
≤ 1 %
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