4 Technical Data
428
7UM62 Manual
C53000-G1176-C149-3
4.15
Undervoltage Protection (ANSI 27)
Setting Ranges /
Resolution
Measurement Quantities:
PositiveSequence Voltages
Pickup Voltage
U<, U<<, Up< 10.0 V to 125.0 V
(Increments 0.1 V)
(27)
Dropout Ratio
U<, U<<
1.01 to 1.20
(Increments 0.01)
(27-1 and 27-2 only)
Delay Time
T U<, T U<<
0.00 s to 60.00 s
(Increments 0.01 s)
(27-Delay)
or
∞
(does not expire)
Time Multiplier
T
MUL
0.10 s to 5.00 s
(Increm. 0.01 s)
for Inverse Characteristic
Add-On Delay Time
T
Up<
0.00 s to 60.00 s
(Increm. 0.01 s)
for Inverse Characteristic
or
∞
(does not expire)
The set time are pure delay times.
Inherent Operating
Times
Pickup Times
Approx. 50 ms
Dropout Times
Approx. 50 ms
Dropout/Pickup
Ratio
Based on the pickup value of the
1.01 or 0.5 V absolute
inverse characteristic
Tripping
Characteristic for
Inverse Function
see also Figure 4-12
Tolerances
– Pickup Voltages
1 % of set value, or 0.5 V
– Delay Times
T, T
Up<
1 % of set value, or 10 ms
– Voltage-Time Characteristic
1 % based on U, or 30 ms
Influencing
Variables
Power Supply DC voltage (VDC) in Range
0.8
≤
V
PS
/ V
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 %
Harmonics
- Up to 10 % 3rd Harmonics
< 1 %
- Up to 10 % 5th Harmonics
< 1 %
t
1
1
U
U
p
-------
–
----------------
T
MUL
⋅
T
Up<
+
=
t
Tripping time
U
Current voltage
U
p
Pickup voltage being
∞
at that
moment (= parameter 4402)
T
MUL
Time multiplier (parameter 4403)
T
Up<
Add-on delay time (4404)
Meaning:
