Installation and Commissioning
8-77SJ62 Manual
C53000-G1140-C121-1
All these jumpers (X61 to X64 and X60) must be in the same position: 1 A or 5 A. If
the highly sensitive current input is used, jumper X64 is omitted.
If nominal current ratings are changed, then the new ratings must be altered under Ad-
dress &76(&21'$5< in the 36\VWHP'DWD (see Sub-section 6.1.1).
Control Voltages
for Binary Inputs
When the device is delivered from the factory, the binary inputs are set to operate with
a DC control voltage that corresponds to the rated DC voltage of the power supply. In
general, to optimize the operation of the inputs, the pickup voltage of the inputs should
be set to most closely match the actual control voltage being used. In some cases
such as the one described in the note below, lowering the pickup voltage might be nec-
essary. Each binary input has a pickup voltage that can be independently adjusted;
therefore, each input can be set according to the function performed.
A jumper position is changed to adjust the pickup voltage of a binary input. The phys-
ical arrangement of the binary input jumpers in relation to the pickup voltages is ex-
plained below, “Jumpers on the Printed Circuit Boards”.
Serial Interfaces When the device is delivered from the factory, the serial interfaces are matched to the
ordered version according to the 11th and 12th figure of the ordering code. The con-
figuration is determined by jumpers on the interface module. The physical arrange-
ment is described below, “Jumpers on the Printed Circuit Boards”.
For reliable data transmission, an RS 485 bus should be terminated with resistors at
the last device on the bus. Terminating resistors are provided in a 7SJ62. As delivered
from the factory, the resistors are switched out. Two jumper positions must be
changed to switch-in the resistors. The jumper positions and the corresponding states
of the resistors are covered below, “Jumpers on the Printed Circuit Boards”. Both
jumpers must always be set in the same position.
Jumpers on the
Printed Circuit
Boards
If changes to jumper settings are required to modify the rating of the power supply, the
nominal rating of the current input transformers, the pickup voltage of binary inputs, or
the state of the terminating resistors, proceed as follows:
o The following equipment is needed:
− Grounded mat for protecting components subject to damage from electrostatic dis-
charges (ESD).
− Screwdriver with a 6 mm wide tip,
Note:
If the 7SJ62 performs trip circuit monitoring, two binary inputs, or one binary input and
a resistor, are connected in series. The pickup voltage of these inputs must be less
than half of the nominal DC voltage of the trip circuit.
Caution!
Jumper-setting changes that affect nominal values of the device render the ordering
number and the corresponding nominal values on the nameplate sticker invalid. If
such changes are necessary, the changes should be clearly and fully noted on the de-
vice. Self adhesive stickers are available that can be used as replacement name-
plates.
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