889-3819-00
MMU2-1600GE series Operations Manual Rev Apr 2020 Page
48
of 51
When a fault is detected, the field status is latched and the field input involved in the detected fault will flash at a 5
Hz rate. The following table lists the information displayed on the Field Status indicators during the various fault
conditions.
FAULT CONDITION
FIELD STATUS INDICATION
24V-1
24V-2
CVM / WD
PORT 1 FAIL
ON
- Field inputs that were ON for at least 33 milliseconds at the time of the fault.
CONFLICT
ON
- Field inputs that were ON for at least 33 milliseconds at the time of the fault.
FLASHING
- Field inputs that were ON and were the cause of the fault.
DIAG FAIL
ON
– The binary coded value of the diagnostic error code with channel 1 being the least significant bit and
channel 16 the most significant bit.
NOTE: This may be incorrectly displayed depending on the type of diagnostic failure being
experienced.
SHORT YEL
ON
- Field inputs that were ON for at least 100 milliseconds at the time of the fault.
FLASHING
- The Yellow field inputs on which a Short Yellow was detected.
SHORT CLR
ON
- Field inputs that were ON for at least 33 milliseconds at the time of the fault.
FLASHING
- The Green field inputs that were not OFF for at least 2.7 seconds before a conflicting
channel was detected as active.
FIELD CHK
ON
- Field inputs that were ON for at least 33 milliseconds at the time of the fault.
FLASHING
- The field inputs that did not agree with the load switch commands from the CU.
LOC FLASH
PRGM CARD
Current field status. (NOT LATCHED)
RED FAIL
ON
- Field inputs that were ON for at least 100 milliseconds at the time of the fault.
FLASHING
- All field inputs for the channel(s) that had no display.
DUAL IND
ON
- Field inputs that were ON for at least 100 milliseconds at the time of the fault.
FLASHING
- Field inputs that were ON and were the cause of the fault.
4.7.2
POWER / TYPE INDICATORS
The
POWER
indicator is on continuously when the AC line voltage is above 98V
RMS
. When the AC line voltage
is below 89V
RMS
, the indicator will flash at a 1 Hz rate to indicate low line voltage. While the AC line voltage is
low, all field status indicators will be off. Any active fault indicators will stay on.
The
TYPE 12
indicator is on continuously when the monitor is operating in the Type 12 mode. This occurs when
the Type Select input (Connector A - Pin HH) is not at a True (Low) logic level. This indicator will have a
disabled indication if the monitor is configured to operate in Type 16 only mode.
4.7.3
TRANSMIT / RECEIVE INDICATORS
The
RECEIVE
indicator turns on for 50 milliseconds every time a valid SDLC frame addressed to the monitor is
received.
The
TRANSMIT
indicator turns on for 50 milliseconds every time a SDLC frame is transmitted.
4.7.4
FAULT INDICATORS
When the monitor Output relay contacts are transferred to the fault condition and the monitor is not timing
Minimum Flash, a fault indicator will be illuminated to identify the source of the fault.
There are two fault indicators with dual function capability. One is the
CVM / WD
indicator. If the fault is a
CVM fault, the
CVM / WD
indicator will be on solid. If the fault is a WD (External Watchdog) fault, the
CVM /
WD
indicator will flash at a five Hz rate. The other fault indicator with dual function capability is the
PRGM
CARD
indicator. The
PRGM CARD
indicator will be on solid if the programming card is not properly seated
while power is applied. The
PRGM CARD
indicator will flash at a five Hz rate if a Reno A&E supplied
programming card which has a defective serial EEPROM is inserted in the programming card slot and the device
(the EEPROM) is activated. The
PRGM CARD
indicator will also flash at a five Hz rate if a non-Reno A&E
programming card is inserted in the programming card slot and the
Programming Card Memory Usage
feature is
activated.
Any monitoring function that is disabled for any reason will display a Function Disabled indication.
4.7.5
FUNCTION DISABLED INDICATION
When a function has been disabled, the associated indicator will turn on for 50 milliseconds once every two
seconds.
