Section 12 Troubleshooting; Troubleshooting The Relay - Eaton Cutler-Hammer FP-5000 Instructions Manual

IL17569
12 TROUBLESHOOTING
There are two aspects to troubleshooting:
1. Failures in the system being protected.
2. Failures of the FP-5000 relay.
The FP-5000 can be programmed to record data during system
faults, which can be analyzed to determine the cause of faults. The
FP-5000 continuously determines its own ability to function, if any
internal failures are detected the FP-5000 can raise an alarm. For
information on troubleshooting the FP-5000 relay failures see
Section 12.1. For information on troubleshooting the circuit the
FP-5000 is protecting, see Section 12.2.
The FP-5000 firmware can be revised in the field by using a PC and
the front mounted serial port on the FP-5000 Section 12.4 covers
the procedures for upgrading the firmware in the field.

12.1 Troubleshooting the Relay

The FP-5000 performs a great many self-checks on a continuous
basis to warn the operating personnel of impending or actual failure,
and allowing steps to be taken to minimize the impact of such
failure. Some internal failures will not effect the ability of the FP-
5000 to protect the circuit while others will. Detected failures of the
FP-5000 will cause the relay healthy contact output to de-energize,
see Section 12.1.1. All FP-5000 failures will cause the Alarm LED
on the front panel to light, and the condition to be reported over the
INCOM communication network usually displayed in the PowerNet
application software. The front display will also indicate failures and
is described in Section 12.1.3.
12.1.1 Relay Healthy Output
The relay healthy alarm is a crucial part of notification for relay
failure. This contact output is energized during normal operation,
when no warnings or failures are present. The relay healthy contact
output is a Form C relay. Typically the normally closed contacts are
used and wired to an alarm that is guaranteed to get immediate
attention. If an FP-5000 relay self diagnostic failure is detected, the
relay healthy alarm will be de-energized and the alarm will be
sounded. In the case of a catastrophic failure of the FP-5000 or its
control power supply, the normally closed relay will cause an alarm
whenever power is removed from the relay healthy contact output.
WARNING
FAILURE TO UTILIZE THE RELAY HEALTHY CONTACT OUTPUT
IN A MANNER THAT WILL BRING IMMEDIATE ATTENTION IF
DE-ENERGIZED CAN RESULT IN A FAILURE TO PROTECT THE
CIRCUIT FOR EXTENDED PERIODS OF TIME.
12.1.2 Failures That Disable Protection
In the case that an FP-5000 critical failure is detected, the protec-
tion functions of the FP-5000 are disabled, and all output relays
except relay healthy will remain in their current state. The relay
healthy output will be de-energized as described in Section 12.1.1.
Protection is disabled so that a false trip operation will not occur. If it
is desired to trip the breaker upon FP-5000 failure then the relay
healthy alarm should be connected to the breaker trip coil in parallel
with the trip output contact. Table 12.1, under the "Protection"
column, shows what diagnostic test failures will cause protection to
be disabled.
Effective June, 2001
Page 12-1