6-30
Reporting and Alarm Functions
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ALARMS FUNCTION
The alarms function monitors internal relay systems, external relay interfaces, and power system equipment.
Alarm points are segregated into Relay Trouble Alarms and Programmable Alarms. Alarm point status is
stored in nonvolatile memory and is retained when relay operating power is lost.
The ability to program the reporting and display of alarms along with the automatic display priority feature
of the HMI gives the relay the functionality of a local and remote alarm annunciator. See Section 10,
Human-
Machine Interface for more information on the automatic display priority logic.
Relay Trouble Alarms
All internal circuitry and software that affects how the relay functions is monitored by the continuous self-test
diagnostics function of the relay trouble alarms. A detailed list of relay trouble alarms is provided in Table
6-16. If any one of these points asserts, the failsafe alarm output relay de-energizes and closes the OUTA
contact, the HMI Relay Trouble LED lights, all output relays are disabled, logic variable ALMREL is set, and
the relay is taken offline. The relay trouble alarms function is not programmable.
If your application requires a normally closed contact that opens to indicate a relay trouble condition, use
BESTlogic to program the output logic. One of the output relays with normally open contacts (OUT1 through
OUT5) can be programmed to be held closed. For example, to open OUT5 for indication of relay trouble,
set the VO5 logic expression at /0 (SL-VO5=/0). A not zero setting is equal to logic 1. When the relay is fully
functional, the OUT5 output contact is closed. Since all output relays are disabled when a relay trouble alarm
exists, OUT5 opens when relay trouble occurs.
Table 6-16. Relay Trouble Alarms
I.D. Number
Diagnostic
Description
1
RAM FAILURE
Static RAM read/write error
2
ROM FAILURE
EPROM program memory checksum error
3
uP FAILURE
Microprocessor exception or self-test error
4
EEPROM FATAL ERROR
EEPROM read/write error
5
ANALOG FAILURE
Analog to digital converter error
6
CALIBRATION ERR
Relay not calibrated or calibration checksum error
7
PWR SUPPLY ERR
Power supply out of tolerance
8
WATCHDOG FAILURE
Microprocessor watchdog circuit timed out
9
SET DFLTS LOADED
Relay using setting defaults
10
CAL DFLTS LOADED
Relay using calibration defaults
Relay trouble alarms, except for CALIBRATION ERR, EEPROM FATAL ERR, SET DFLTS LOADED, and
CALDFLTS LOADED indicate that the relay is not functional and causes the self-test diagnostics to force
a microprocessor reset to try to correct the problem.
CALIBRATION ERR, EEPROM FATAL ERROR, or DFLTS LOADED errors indicate that the relay is
functional but needs re-calibration or the settings reprogrammed.
Any relay trouble alarm will disable the protection functions, light the Relay Trouble LED, and place the
output contacts in their normal, de-energized state. If a relay trouble (RA-REL) alarm is cleared by pressing
