Power Automation and Protection Division
I.L. 40-201.9
REL 352 Version 1.00
J-3
J
A
P
P
E
N
D
I
X
1.6.
Troubleshooting
In the event the communication remains unsuccessful, first make sure that the relay is powered, proper com-
munication cable is used (Table J-1), and the connection is good.
For further testing, check that the bit rate (Baud) on the RS-PONI (Table J-2) is set to correspond to the one
displayed at the bottom right of the RCP display.
If after these verifications the problem remains, try to remove the power from the relay and apply it again. If the
communication still fails (several attempts), the communication equipment needs to be serviced.
1.7.
SIXTEEN FAULT TARGET DATA
The REL 352 saves the latest 16 fault records, but only the latest two fault records can be accessed from the
front panel. For complete 16 fault data, the computer communication is necessary.
1.8.
OSCILLOGRAPHIC DATA
Three sets of oscillographic data are stored in REL 352. Each set includes seven analog traces (Va, V
b
, V
c
, I
a
,
I
b
, I
c
and I
n
), with one cycle pre-fault and 7-cycle fault information, and 20 sets of digital data based on 12 sam-
ples per cycle. Refer to Section J.2 for detailed information.
NOTE:
IF POWER IS INTERRUPTED TO RELAY ALL “OSCILLOGRAPHIC DATA” WILL BE LOST
.
* NOTE:
A communications cable kit item identification number 1504B78G01) that will accommodate
most connection combinations is available through your local ABB representative.
Table J-1 Communications Cable Requirements
Connection Type
Cable
(Straight = no
null modem)
Pins Req’d.
(All pins
not required)
Cable Connectors
Data Rate
DB-25S, RS-232C connected to PC*
Straight
2, 3, 7
To port: 25 pin DTE
To PC: 9 or 25 pin DCE
1200 bps only
DB-25S, RS-232C connected to modem
Null Modem
2, 3, 7
To port: 25 pin DTE
to Modem: 25 pin DTE
1200 bps only
DB-9P, RS-232C connected to PC*
Null Modem
2, 3, 5
To port: 9 pin DCE
To PC: 9 or 25 pin DCE
See Table J-2
For settings
DB-9P, RS-232C connected to modem*
Straight
2, 3, 5
To port: 9 pin DCE
To Modem: 25 pin DTE
See Table J-2
For settings
