MMU-16LE
SmartMonitor
Operations Manual
Eberle Design Inc.
Page 9
2.3.2.1 CVM MONITOR LATCH INPUT
A jumper position is supplied on the Programming Card to allow CVM failures to latch in the
fault condition until the unit is reset by the activation of the RESET button or the
EXTERNAL RESET input. See Section 6.2.4 for the programming procedure. A CVM
failure during the programmed Minimum Flash time or during an MMU Power Failure will
not cause a latched fault condition.
2.3.2.2 CVM LOG DISABLE
If CVM events are not related to a malfunction condition and occur on a regular basis such
as Time of Day flash, the logging of these events can be disabled. See Section 6.3.4.3.
2.4 LOCAL FLASH STATUS INPUT
This input is to be connected to the Auto/Flash switch in the cabinet. When the TRUE (low)
state is present for more than the Local Flash Fault time (Section 9), the MMU-16LE
SmartMonitor
®
will enter the fault mode, transfer the OUTPUT relay contacts to the Fault
position, and display the LOCAL FLASH status screen. When the TRUE (low) state is
present for less than the Local Flash No-Fault time, the MMU-16LE
SmartMonitor
®
will not
transfer the OUTPUT relay contacts to the Fault position. The MMU-16LE
SmartMonitor
®
will automatically reset the OUTPUT relay when the False (high) state is restored to the
input. The MMU-16LE
SmartMonitor
®
will remain in the fault mode for at least the time
determined by the Minimum Flash programming. A Local Flash condition during the
Minimum Flash time or during an MMU Power Failure will not cause a fault condition.
2.5 MINIMUM YELLOW CHANGE / RED CLEARANCE MONITORING
2.5.1 MINIMUM YELLOW CHANGE INTERVAL
The MMU-16LE
SmartMonitor
®
will verify that the Yellow Change interval is at least the
Clearance Fail Fault time (Section 9). The Yellow Change interval consists of the duration
of time in which the Yellow field signal input is active in a sequence from Green to Yellow to
Red. When this minimum interval is not satisfied the MMU-16LE
SmartMonitor
®
will enter
the fault mode, transfer the OUTPUT relay contacts to the Fault position, and display the
SKIPPED Y CLEARANCE or SHORT Y CLEARANCE status screen. The MMU-16LE
SmartMonitor
®
will remain in the fault mode until the unit is reset by the RESET button or
the EXTERNAL RESET input.
Minimum Yellow Change Monitoring will be disabled when the RED ENABLE input is not
active.
2.5.1.1 MINIMUM YELLOW CLEARANCE DISABLE
A set of soldered wire jumpers is provided on the Programming Card to disable Minimum
Yellow Change Monitoring on a per channel basis. See Section 6.2.3 for the programming
procedure.
2.5.2 MINIMUM YELLOW PLUS RED INTERVAL
The MMU-16LE
SmartMonitor
®
will verify that the Yellow Change plus Red Clearance
interval between the end of an active Green (or Walk) signal and the beginning of the next
conflicting Green (or Walk) signal is at least the Clearance Fail Fault time (Section 9). This
ensures a minimum clearance interval for channels without a true yellow signal such as
pedestrian channels. When this minimum interval is not satisfied the MMU-16LE
SmartMonitor
®
will enter the fault mode, transfer the OUTPUT relay contacts to the Fault
position, and display the SHORT Y+R CLEARANCE status screen. The MMU-16LE
SmartMonitor
®
will remain in the fault mode until the unit is reset by the RESET button or
the EXTERNAL RESET input.
Yellow Change plus Red Clearance Monitoring will be disabled when the RED ENABLE
input is not active.