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4
Troubleshooting
4 Troubleshooting
4.1
Overview
The ISGS relay employs self-checking circuits
and
software
so that calibration and adjustments are not required
.
Prior to
instalation, a simple check of functionality, usng a
commer-
cially available relay test set, shoud be sufficient under most
conditions.
In the event of protiem occurrences during acceptance
testing or after installation, the general problem determina-
tion
nformation
provided
n
this section should be helpful.
4.2
System
The green
System
LED is illuminated at all tmes when the
relay is operating properly. When this LED is on,
it
ndicates
that
1.
control power is reaching the relay
2.
the relay internal power supply is functioning normally
3.
the relay microprocessng system is functioning nor-
mally (i.e.,
nternal
self-checking has found no prob-
lems)
The relay includes a
"Relay
disabled" contact which is open
whenever the relay is operating
normally.
This contact will
close whenever the relay self-checking system detects a
internal problem or if power to the relay is removed
.
The
contact can also be closed by the breaker monitoring func-
tion (refer to Appendix C)
.
If the green
System
LED is off or the
"Relay
disabled"
con-
tact is closed, check and ensure that correct power is beng
supplied to the relay power input
terminals.
If the relay is
receiving correct po'M'lr, there is likely an internal relay
prob-
lem. Contact the nearest Siemens sales office for
nforrna-
tion on returning the relay to the factory for analysis.
36
4.3
Monitor Mode
To aid in factory testing, the ISGS relay includes software
routines used only in the factory. These routnes are not for
use outside the factory.
However,
with some unique types of
internal faik.Jres, this special test mode can be activated.
When this happens, the LCD
wil
display the message
"Monitor Entry." If this message appears in the LCD, there is
an intemal relay faik.Jre, and the relay is no
longer
providng
protection.
If the message described above appears, take the relay and
its associated primary circuits out of service immediately.
Then contact the nearest Siemens sales office for informa-
tion on returning the relay to the factory for analysis.
Siemens
Energy
& Automation, Inc.
,#"·
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