START
ST1L1
ST1L2
ST1L3
TR1
START
ST2
TR2
TRIP
MinVoltSelect
Start
&
Trip
Output
Logic
Step 1
Start
&
Trip
Output
Logic
Step 2
Phase 3
Phase 2
Phase 1
Phase 3
Phase 2
Phase 1
Timer
t2
Voltage Phase
Selector
OpMode2
Time integrator
or Timer t1
Voltage Phase
Selector
OpMode1
1 out of 3
2 out of 3
3 out of 3
TRIP
TRIP
OR
OR
OR
OR
OR
OR
START
UL1 or UL12
UL2 or UL23
UL3 or UL31
Comparator
U < U1<
1 out of 3
2 out of 3
3 out of 3
ST1
IEC08000016-3-en.vsd
Comparator
U < U1<
Comparator
U < U1<
Comparator
U < U2<
Comparator
U < U2<
Comparator
U < U2<
IEC08000016 V3 EN
Figure 92:
Schematic design of Two step undervoltage protection UV2PTUV
9.1.8
Technical data
Table 135:
UV2PTUV technical data
Function
Range or value
Accuracy
Operate voltage, low
and high step
(1–100)% of
UBase
± 0.5% of U
r
Reset ratio
<102%
-
Inverse time
characteristics for
low and high step,
see table
-
Table continues on next page
Section 9
1MRK 504 135-UEN A
Voltage protection
208
Technical manual
Summary of Contents for ret650
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