3.1 Mounting and Connections
345
7UT613/63x Manual
C53000-G1176-C160-2
3.1.2 Hardware Modifications
3.1.2.1 General
Hardware modifications concerning, for instance, nominal currents, the control voltage
for binary inputs or termination of serial interfaces might be necessary. Follow the pro-
cedure described in this subsection, whenever hardware modifications are done.
Auxiliary Voltage There are different input ranges for the power supply voltage (refer to the data ordering
information in the Appendix). The power supplies with the ratings 60/110/125 VDC
and 110/125/220/250 VDC / 115/230 VAC are interconvertible. Jumper settings deter-
mine the rating. The assignment of these jumpers to the supply voltages and their
physical location on the PCB are described below under „CPU Processor Board“.
When the device is delivered, these jumpers are set according to the name-plate
sticker and generally need not be altered.
Rated Currents Jumper settings determine the rating of the current input transducers of the device.
The position of jumpers are set according to the name-plate sticker to 1 A or 5 A.
If the current transformer sets at the measuring locations and/or the 1-phase measure-
ment inputs have different secondary rated currents, this must be adapted in the
device. The same applies for the current transformers of the various busbar feeders
when single-phase busbar protection is applied. Using single-phase busbar protection
with interposing summation transformers, the rated currents are usually 100 mA.
The physical arrangements of these jumpers that correspond to the different current
ratings are described below under margin heading „Input/Output Board C–I/O-2“, „In-
put/Output Board C–I/O-9 (all versions)“ and „Input/Output Board C–I/O-9 (only
7UT635)“.
When performing changes, please make sure that the device is always informed about
them:
• Using three-phase applications and single-phase transformers, check the current
transformer data for the three-phase measuring locations, see Section 2.1.4 under
margin heading „Current Transformer Data for Three-phase Measuring Locations“.
• Using three-phase applications and single-phase transformers, check the current
transformer data for the auxiliary single-phase measuring locations, see Section
2.1.4 under margin heading „Current Transformer Data for Auxiliary Single-phase
Measuring Locations“.
• In case of changes regarding the sensitive 1-phase auxiliary inputs, check the CT
ratios - refer to the paragraph 2.1.4 under margin heading „Current Transformer
Data for Single-phase Auxiliary Inputs“.
• Using single-phase busbar protection, changes for the different measuring loca-
tions must correspond to the associated current transformer data (refer to subsec-
tion 2.1.4 under margin heading „Current Transformer Data for Single-Phase
Busbar Protection“.
Control Voltage for
Binary Inputs
When the device is delivered from the factory, the binary inputs are set to operate with
a voltage that corresponds to the rated DC voltage of the power supply. In general, to
optimize the operation of the inputs, the pick-up voltage of the inputs should be set to
most closely match the actual control voltage being used.
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