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L3016
1SDH000559R0002
ABB SACE
SACE PR021/K
5.3.
Dip-switch settings
After correctly wiring all front connections, it is necessary to set the dip-switches on the top of the PR021/K unit.
The criteria for wiring the front connections and for dip-switch setting, depend upon the type of protection unit connected
to the PR021/K unit; the following paragraphs detail the possible configurations.
N.B.: dip-switch reading is carried out at “power on” or after a hardware reset (pressing front “Reset” button) and is active
after start-up.
.
.
DIS. = self-test disabled
EN. = self-test enabled
2
3
4
5
9
PROG.
OFF = Operating mode
ON = Programming mode
For ABB SACE use only.
For normal operating mode, set this dip-switch to OFF.
13
N.U.
OFF = - -
ON = - -
Not used.
For normal operating mode, set this dip-switch to OFF.
12
Term.
OFF = Termination switched
off
ON = Termination switched on
Turn (ON) to terminate the local bus with a 120 resistance
The choice depends on the actual position of the PR021/K unit on the backbone of the communication system.
11
LATCH
OFF = latch OFF
ON = latch ON
If Latch is enabled, the signals of each individual relay are maintained (self-retained) and can only be reset by a
reset command (see par. 4.2).
10
RESET
MAN = manual reset
AUTO = automatic reset
This dip-switch is used to select the reset mode.
Manual reset: in the case of a trip, the signals are "frozen" until a reset is carried out (see par. 4.2)
Automatic reset: the signals of a trip are reset automatically when the trip on the protection unit is reset. In this
case, to reset the signals of the PR021/K unit, the trip signals on the protection unit must be reset.
8
K51/
EN.= Normal mode
DIS.= Stand-by mode
Normal operating mode ensures that the K51 contacts switch when the conditions which normally cause
switching exist (normal operating) and the related indicator LED lights.
Stand-by mode ensures that the K51 contacts do not switch under any circumstances, even under conditions
which would normally cause switching (the indicator LEDs K51/1...K51/8 will still light).
If set to ON (Stand-by) the unit is not able to carry out a self-test (performs the self-test by activating the LEDs
only).
For normal operating mode, set this dip-switch to OFF.
7
BAUD
19.2kbit/s = baud rate
19200bit/s
38.4kbit/s = baud rate
38400bit/s
Setting of the transmission speed must be equal to that of the connected protection unit.
K51
Configuration
A= type A signal
B= type B signal
Depending on the type of protection unit to which the PR021/K unit is connected, the signal of the event
associated with switching of some contacts (K51) may be chosen from two alternatives (A or B).
N.B. For some protection units, an alternative which can be selected using the dip-switches is not provided. In
this case the event associated with each contact is unique (defined by ABB SACE), and is independent of the
position of the dip-switch (OFF or ON).
6
MODE
SLAVE = Slave mode
MASTER = Master mode
Setting to Master mode is necessary when the PR021/K unit is combined with a protection unit without a
communication unit (see "scenario PR021/K in Master mode" and mixed "Slave" scenario, par. 1.2).
Setting to Slave mode is necessary when the PR021/K unit is connected to a protection unit and a master
communication unit (see "scenario PR021/K in Slave mode" and mixed "Slave" scenario, par. 1.2).
Dip-sw name
Settable values
Notes
1
TEST
The "Self-test" function switches all 8 internal relays in sequence.
The Tx LED lights on each switching, and will flash once the self-test is finished according to the indications
listed in par. 3.2.
For normal operating mode, set this dip-switch to OFF.
Dip-sw no.
Ω
