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Siemens AG ⋅ May 1998
The bay unit is operated via the integrated keypad in a
user-device dialog.
All parameters relevant for operation of the protection
system 7SS52 (settings, configuration data) and the
protection reactions (operational and fault events,
fault records) are administered in the master unit.
The operation function of the bay unit is used for
marshalling of inputs and outputs, for display of meaĆ
sured values, for starting tests and changing selected
parameters.
For display an LC display with 4 lines, each with 16
characters and background illumination is provided.
During the dialogue, a 4-digit number will be seen in
the display, followed by a bar. This number represents
the setting address. The first two digits indicate the
operation block, followed by a two-digit sequence
number.
The background illumination is switched on by any
key. It is automatically switched off, if no operation is
carried out over a period of 10 minutes.
The keypad comprises 12 keys with the following
meanings:
Keys for scrolling in the display:
Forward scrolling: the next operating
position is shown in the display
Reverse scrolling: the previous operating
position is shown in the display
Forward scrolling block-wise: the beginĆ
ning of the next operating block is shown
in the display
Reverse scrolling block-wise: the beginĆ
ning of the previous operating block is
shown in the display
Control keys:
Enter-key:
D Confirmation of new data for changing
the configuration or parameterizing and
after entering the password;
D Entering the next lower level of the opĆ
erating tree
D Switch-over between ordering number
and operational measured value in the
4-line mode
D Leaving the operating level
D jumps back to the next higher level in
the operating tree
D Execute LED test;
D Reset LED indications and operational
measured value display in the 4-line
mode
not used
Functional keys:
Direct access into the operating tree for
executing the alarm "bay out of service"
to the master unit
Initiate circuit breaker test
The functional keys F1, F2, F3 and F4 are used as
numerical keys (1, 2, 3, 4) for entering the password.
ENTER
ESC
LED
MENU
F1
F2
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