2010ECL-NYC SERIES SIGNAL MONITOR
OPERATIONS MANUAL
Eberle Design Inc.
Page 3
Section 2
EXTENDED FEATURES
The following extended features are provided on the Signal Monitor to provide additional fault
monitoring functions, to increase the reliability of the monitor operation, and enhance the
diagnostic capabilities offered to the service technician.
2.1 HARDWARE FEATURES
The 210/2010/2018 series Signal Monitor is a dual microprocessor based unit. All monitoring
functions and features are firmware programmable that permits upgrades or modifications by
simply reprogramming the Flash memory device containing the firmware with the upgraded
version. Thus, most changes to the Signal Monitor specifications may be accommodated
without modifying the hardware.
Since all critical timing functions are accomplished by the microprocessor, the quartz crystal
based accuracy results in very precise and repeatable measurements. This accuracy is
maintained on functions from timing fault conditions to implementing a unique firmware based
digital sampling and filtering algorithm. This algorithm is applied to all AC field signals to help
eliminate false detection in a "noisy" AC line environment.
Input voltages are measured using a true Root Mean Squared (RMS) technique. A dedicated
microprocessor RMS- Engine controls the analog to digital (A/D) hardware which samples
each AC input voltage 32 times per cycle. The RMS-Engine then calculates the true RMS
voltage value producing accurate results which are very insensitive to changes in frequency,
phase, wave shape, and distortion. Voltage references are temperature compensated for
constant voltage levels within the operating temperature range.
A nonvolatile EEPROM device is utilized to retain fault status information and event logs in
the event of an AC Line power interruption. The correct fault indications will be displayed
upon restoration of AC Line power. This EEPROM device requires no battery back-up. The
time of day in the model
“ECL” model is stored in a battery-backed real time clock circuit.
Should this battery fail, only current time of day and date information will be lost. No monitor
configuration programming is stored under battery power.
2.2 RED FAILURE MONITORING
The Signal Monitor is designed to adapt Red Failure Monitoring to a conventional controller
cabinet assembly. The simultaneous absence of active Green, Yellow, and Red field signal
voltages on a channel places the Signal Monitor into the fault mode causing the Output relay
contacts to close and enabling the Stop-Time output to the controller. Sixteen Red signal
inputs, a Red Enable input, and two Special Function preemption inputs (SF1, SF2) are
connected to the monitor via a front panel connector (P8) and ribbon cable assembly.
Chassis Ground may also be connected to the unit through pin P8-4. Jumper E14 must then
be inserted to complete the connection.
The Red Fail fault timing value is selected by the Red Fail timing Option switch labeled RF
2010. See Section 4.4.1.
This monitoring function is enabled by applying AC+ to the Red Enable input (P8-20). Unused
Red signal inputs must be tied to AC+ to prevent a Red Failure on those channels. Red
Failure monitoring is disabled for all channels when the Red Enable input is not active, or
the EE input (MC Coil) is active.
2.2.1 RED FAIL SSM ENABLE
The Red Fail function can also be enabled on a per channel basis using the SSM switches.
If the “RF SSM” option switch is in the On position (Section 4.4.7), then each channel will be
monitored for a Red Fail condition if the corresponding SSM switch is in the On position. Red
