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Power Automation and Protection Division
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
I
, I
and I
), with one cycle pre-fault and 7-cycle fault information, and 20 sets of digital data based on 12 sam-
b
c
n
ples per cycle. Refer to Section J.2 for detailed information.
NOTE:
IF POWER IS INTERRUPTED TO RELAY ALL "OSCILLOGRAPHIC DATA" WILL BE LOST.
Table J-1 Communications Cable Requirements
Connection Type
DB-25S, RS-232C connected to PC*
DB-25S, RS-232C connected to modem
DB-9P, RS-232C connected to PC*
DB-9P, RS-232C connected to modem*
* NOTE: A communications cable kit item identification number 1504B78G01) that will accommodate
most connection combinations is available through your local ABB representative.
REL 352 Version 1.00
Cable
Pins Req'd.
(Straight = no
(All pins
null modem)
not required)
Straight
2, 3, 7
Null Modem
2, 3, 7
Null Modem
2, 3, 5
Straight
2, 3, 5
I.L. 40-201.9
Cable Connectors
Data Rate
To port: 25 pin DTE
1200 bps only
To PC: 9 or 25 pin DCE
To port: 25 pin DTE
1200 bps only
to Modem: 25 pin DTE
To port: 9 pin DCE
See Table J-2
To PC: 9 or 25 pin DCE
For settings
To port: 9 pin DCE
See Table J-2
To Modem: 25 pin DTE
For settings
, V
, I
,
b
c
a
A
P
P
E
N
D
I
X
J
J-3
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