Siemens 7UT51 User Manual

16
Bench Testing
7UT51 v3
174 PRIM-2330C
Settings for Trip Relays, Signal Relays, and LEDs
– All 49 Tests
Apply the following setting. If only one 49 is being
tested, the events for the other element are not
needed.
• LED 2 = nm 1571 49-TRIP by thermal O/L
protection 1 (nm means no memory)
= nm 1621 49-TRIP by thermal O/L protection
2 (nm means no memory)
• LED 3 = nm 1566 49-Thermal O/L prot.1: Thermal
warning
= nm 1616 49-Thermal O/L prot.2: Thermal
warning
• LED 4 = nm 1565 49-Thermal O/L prot.1: Current
warning
= nm 1615 49-Thermal O/L prot.2: Current
warning
• Signal Relay 1 = 1565 49-Thermal O/L prot.1:
Current warning
= 1615 49-Thermal O/L prot.2: Current
warning
• Signal Relay 2 = 1566 49-Thermal O/L prot.1:
Thermal warning
= 1616 49-Thermal O/L prot.2: Thermal
warning
• Trip Relay 1 = 1571 49-TRIP by thermal O/L
protection 1
= 1621 49-TRIP by thermal O/L protection 2
16.7.1 Warning, Overload Current:
Address 2405 (49
-
1) and
2505 (49
-
2)
Connect the 7UT51 using the example and the
accompanying Figure 16.13. The timer is not needed
for this test.
49-1 Current Warning:
1. The alarm should occur near
[I ALRM1, Address 2405 X I
NsecWx
]
or
[I ALRM2, Address 2405 X I
Objsec
].
Slowly increase the current until LED 4 lights
and the contact of Signal Relay 1 closes.
Record the current.
2. Slowly decrease the current until LED 4 goes out
and the Signal Relay 1 contact opens. Record the
current.
3. Turn off the current, note the LCD display, and
reset the targets.
49
-
2 Current Warning:
Follow steps 1-3 using
Address 2505 in step 1.
Expected Results
The 49-1 current warning should occur within +/- 3%
of [Address 2405 X I
NsecWx
] or [Address 2405 X
I
Objsec
]. This applies for 49-2 also, using
Address 2505.
The 49 warning should dropout at a current between
[95% and 99%] of the actual current at pickup.
For the default settings and the changes made, LED 4
should light and the contact of Signal Relay 1 should
close when the 49 current warning occurs. At dropout,
the LED should go out and the contact open. The
LCD should not give an indication of the event.
Notes about 49 Trip Times and Alarm Times
The tests below require there be no preload before 49
temperature warnings and 49 tripping are tested.
Without preload, the trip time of 49 is calculated:
Let a
1
= 49k factor, Address 2402 X I
NsecWx
I1
or
Let a
1
= 49k factor, Address 2402 X I
Objsec
(for 49-1)
I1
Let a
2
= 49k factor, Address 2502 X I
NsecWx
I1

Siemens 7UT51 Specifications

General

Brand	Siemens
Model	7UT51
Category	Relays
Language	English