Installing Or Replacing The Battery; Changing The Rated Nominal Current Of The Current Inputs - Siemens 7UT51 Instruction Manual

7UT51 v3
17.8 Installing or Replacing
the Battery
While the relay's settings are stored in non-volatile
RAM memory, the event logs and captured waveform
data are not. In addition, the internal clock requires
continuous power. To provide power during any power
failure, the relay has a backup battery. When shipped
from the factory, the relay's battery is not installed (to
keep it from running down).
This procedure interrupts the
protection provided by the relay!
To install the backup battery, do the following:
1. Prepare the battery by cutting and bending the
leads as shown in Figure 17.13.
0.6"
(15 mm)
(40 mm)
Figure 17.13 Battery Leads Length and Shape
2. Remove the main module from the relay case and
place it on its side (see Section 17.3 on
page 180).
3. Insert the battery leads into the terminals shown in
Figure 17.14 and tighten the terminal screws.
PRIM-2330C
0.6"
(15 mm)
1.6"
Installation and Servicing
+
Rear View with Housing Removed
Figure 17.14 Battery Location
4. Insert the module back into the relay case and
re-attach the front cover (see Section 17.3 on
page 180).
17.9 Changing the Rated
Nominal Current of the
Current Inputs
When shipped from the factory. The rated nominal
current of all the relay's current inputs is either 1A or
5A, depending on which was ordered. The rated
nominal current for the current inputs monitoring each
winding (or bus branch), and for the two
ground-current inputs (on a 7UT513) can be changed
by making a hardware modification. All three
phase-current inputs for a particular winding (or bus
branch) must have the same rated nominal current. To
make the modification, do the following:
1. Remove the module(s) from the relay case as
described in Section XREF.
2. If the last two characters of the relay's serial
number are JH or alphabetically earlier, use a
soldering iron, connect or disconnect the wire
jumpers as shown in Figure 17.17.
or
If the last two characters of the relay's serial
number are KK or alphabetically later, position
the plug jumpers and shown in Figure 17.18
and Figure 17.19.
3. Return the module(s) to the relay case, as
described in Section XREF.
17
+
View of the Circuit Board
189