5
Made in Finland
25
26
27
73
74
75
70
71
72
61
62
65
66
68
69
80
81
77
78
10
11
TTL
B470498
Rx
Tx
Fig. 3. Rear view of sensitive earth-fault relay SPAJ 111 C.
Specification of input and output terminals
Contacts
Function
25-26
Neutral current I
0
(I
n
= 5 A)
25-27
Neutral current I
0
(I
n
= 1 A)
10-11
External blocking signal (BS)
61-62
Auxiliary power supply.
When DC voltage is used the positive pole is connected to terminal 61.
65-66
Trip output 1 for stages I
0
> and I
0
>> (TRIP 1)
68-69
Trip output 2 for stages I
0
> and I
0
>> (TRIP 2)
80-81
Signal on tripping of stages I
0
> and I
0
>> (SIGNAL 1)
77-78
Signal on tripping of stage I
0
>>, start of stages I
0
> and I
0
>> (START 1)
73-74-75 Start of stage I
0
> (START 2). Under normal conditions the contact interval 73-75
is closed. When stage I
0
> starts, the contact interval 74-75 closes.
70-71-72 Self-supervision (IRF) alarm output. Under normal conditions the contact interval
70-72 is closed. When the auxiliary voltage disappears or an internal fault is
detected, the contact interval 71-72 closes.
Protective earth terminal
The sensitive earth-fault relay SPAJ 111 C is
connected to the fibre optic data communica-
tion bus by means of the bus connection module
SPA-ZC 17 or SPA-ZC 21.
The bus connection module is fitted to the D-
type connector (SERIAL PORT) on the rear
panel of the relay. The opto-connectors of the
optical fibres are plugged into the counter con-
nectors Rx and Tx on the bus connection mod-
ule. In the bus connection module the switches
for selection of the communication mode are to
be set in position "SPA".
