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Section 8
Voltage protection
8.1.8
132
UL1 or UL12
Comparator
U < U1<
UL2 or UL23
Comparator
U < U1<
UL3 or UL31
Comparator
U < U1<
MinVoltSelect
Comparator
U < U2<
Comparator
U < U2<
Comparator
U < U2<
IEC08000016 V3 EN
Figure 56:
Schematic design of Two step undervoltage protection UV2PTUV
Technical data
Table 72:
UV2PTUV technical data
Function
Range or value
Operate voltage, low
(1–100)% of
and high step
Reset ratio
<102%
Inverse time
-
characteristics for
low and high step,
see table
465
Table continues on next page
Phase 1
Voltage Phase
Selector
OpMode1
Phase 2
1 out of 3
2 out of 3
Start
Phase 3
3 out of 3
&
Trip
Output
Logic
START
Step 1
Time integrator
TRIP
or Timer t1
Phase 1
Voltage Phase
Selector
OpMode2
Phase 2
1 out of 3
2 out of 3
Start
Phase 3
3 out of 3
&
Trip
Output
Logic
START
Step 2
Timer
TRIP
t2
UBase
1MRK 505 288-UEN A
ST1L1
ST1L2
ST1L3
OR
OR
OR
OR
START
OR
OR
IEC08000016-3-en.vsd
Accuracy
± 0.5% of U
r
-
See table
465
Technical manual
TRIP
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