Advertisement
1
3
5
Caption
1 LED for signalling serial communication active
2 Change-over switch disabling remote closing and
opening command from system
3 Change-over switch for enabling manual or elec-
tronic programming from remote supervision
system
4 Dip Switch for adjusting serial transmission speed
(baud rate)
5 Dip Switch for adjusting unit address
2
Data transmitted
The PR512/PD unit is able to transmit the follow-
ing information:
a) number of circuit-breaker mechanical opera-
tions
b) parameters of the protection functions
c) phase and homopolar currents (with minimum
value of 5% In)
d) "Low current" indication with current less than
5% In
e) currents relative to the last trip
f) state of the protection functions:
– normal operation
– alarm (I>, I>>, Io>, Io>>)
– relay tripped
g) state of the internal bus
h) state of the circuit-breaker:
– circuit-breaker open
– circuit-breaker closed
– circuit-breaker connected or isolated
– state of the operating mechanism springs:
discharged or charged.
4
Data received
The PR512/PD unit can receive the following data
from the centralised control system:
a) all the parameters of the protection functions
b) circuit-breaker opening command
c) circuit-breaker closing command.
Disablement of opening – closing command
By means of the REMOTE CONTROL change-
over switch on the front of the unit, which is easily
accessible, the circuit-breaker opening and
closing commands coming from the centralised
control system can be disabled (DISABLE posi-
tion).
Setting the parameters to manual or electronic
mode
By means of the SETTING change-over switch on
the front of the unit, it is possible to enable manual
setting, operated by means of the Dip Switches on
the front of the unit (MANUAL position), or elec-
tronic setting by means of the centralised system
(ELECTR. position).
5
23
Advertisement
