NEMA TS-1 Enhanced Signal Monitor Operations Manual
NSM-3ENEMA TS-1Enhanced Signal MonitorOperations ManualTHIS MANUAL CONTAINS TECHNICAL INFORMATION FOR THE NSM-3E SERIESSIGNAL MONITOR UNIT.REVISION: JULY 2017pn 888-0003-002
THE NSM-3E SERIES MONITORS ARE DESIGNED AND MANUFACTURED IN THE USABY EBERLE DESIGN INC., PHOENIX, ARIZONA, AN ISO 9001:2015 REGISTEREDCOMPANYINFORMATION CONTAINED HEREIN IS PROPRIETARY TECHNICAL INFORMATIONOF EBERLE DESIGN INC. PUBLICATION, REPRODUCTION OR USE IN WHOLE ORPART IS NOT PERMITTED EXCEPT UNDER TERMS AGREED UPON IN WRITING.LEDGUARD IS A REGISTERED TRADEMARK OF EBERLE DESIGN INC. COPYRIGHT 2017 EDI.MAINTENANCE NOTETHIS EBERLE DESIGN INC. AUXILIARY MONITOR UNIT HAS BEENCAREFULLY INSPECTED AND TESTED TO ENSURE PROPEROPERATION. IT IS RECOMMENDED THAT THE AUXILIARYMONITOR UNIT BE TESTED AT LEAST ANNUALLY TO ENSUREPROPER OPERATION AND COMPLIANCE WITH FACTORYSPECIFICATIONS.
Table of ContentsSection 1 Standard Functions . 11.1 Introduction . 11.2 Conflict Monitoring. 11.3 Red Failure Monitoring . 11.3.1 Walk Disable (Red Monitoring) . 21.4 Voltage Monitoring . 21.4.1 Voltage Monitor Fault Latch . 21.4.2 CVM Fault Latch . 21.5 AC Brown-out / Interruption Detection . 2Section 2 Extended Features . 32.1 Hardware Features. 32.2 Dual Indication Monitoring . 32.2.1 GY-Dual Indication Monitoring. 32.2.2 Walk Disable (Dual Indication Monitoring) . 42.3 Clearance (Short or Absent Yellow) Monitoring . 42.4 Recurrent Pulse Detection (RP STATUS). 42.5 LEDguard LED Field Signal Sensing . 52.6 Non-Volatile Fault Memory . 52.7 Reset Input Detection . 52.8 Display LED Test . 5Section 3 Installation. 63.1 Harnessing Connectors . 63.2 Minimum Flash Dip Switch Programming . 63.3 SSM Dip Switch Programming . 63.4 Option Dip Switch Programming. 63.4.1 GY Enable . 63.4.2 RP DISABLE. 63.4.3 WALK DISABLE. 73.4.4 CVM LATCH . 73.4.5 24V LATCH. 73.4.6 LEDguard. 73.4.7 OPTION A. 7Section 4 Front Panel Description. 84.1 Status Display . 84.1.1 POWER Indicator. 84.1.2 CONFLICT Indicator . 84.1.3 RED FAIL Indicator . 84.1.4 CVM Indicator . 84.1.5 24V-1, 24V-2 Voltage Monitor Indicators . 84.1.6 DIAGNOSTIC Indicator . 84.1.7 RP STATUS Indicator . 84.1.8 DUAL INDICATION Indicator . 84.1.9 CLEARANCE Indicator . 94.2 No Fault CHANNEL Display . 94.3 Fault CHANNEL Display. 94.4 RESET Button . 9Section 5 Specifications .105.1 Electrical .105.1.1 Power Requirements.105.1.2 AC Voltage Monitors (Positive or Negative half wave input) .105.1.3 DC Voltage Monitor .10
5.1.4 Logic Inputs .105.2 Timing Functions .105.3 Mechanical .115.4 Environmental .11Section 6 Wiring Assignments .126.1 NSM-3E Monitor Unit Connector A .12
NSM-3E Signal Monitor UnitOperations ManualSection 1Standard Functions1.1 INTRODUCTIONThe NSM-3E Signal Monitor is a device used in a traffic controller assembly to monitortraffic signals at an intersection for conflicting proceed indications or the absence of voltageon all of the field signal outputs of a channel caused by malfunctions of the controller, loadswitches, or miswiring of the cabinet. The NSM-3E Signal Monitor also provides errorsensing of two 24VDC supplies and the controller power supplies via 24V-1, 24V-2, andController Voltage Monitor (CVM) inputs respectively. This unit is directly interchangeablewith a standard NEMA 3-channel Signal Monitor and meets with or exceeds allspecifications outlined in Chapter 6 (Conflict Monitors) of the National ElectricalManufacturers Association (NEMA) Standards Publication TS1-1989 R2005, TrafficControl Systems.The NSM-3E Signal Monitor is a 3 channel monitor. Each channel has the capability ofmonitoring a Green, a Yellow, a Red, and a Walk field signal output at the field terminals.The NSM-3E Signal Monitor detects the presence of conflicting Green or Yellow or Walksignals on the AC field terminations between any two or more channels. The Red Enableinput, when active, enables the Red Monitoring and Dual Indication capabilities of themonitor causing the unit to trigger when it detects the absence of voltage on all four of thefield signal inputs of a channel or more than one input color active simultaneously. Themonitoring circuitry can detect either full wave or positive and negative half-wave fieldsignal outputs at the specified voltage levels.When triggered by the detection of a fault condition which exists longer than the minimumperiod defined by the NEMA Traffic Control Systems Specifications (TS-1, part 6), theNSM-3E Signal Monitor will enter the fault mode causing the Output relay to de-energizeand two sets of contacts on the Output relay to transfer. The cabinet assembly should bewired such that the closure of the signal monitor Output relay contacts will cause anautomatic switching of the field signal outputs from normal operation to flashing operation.The NSM-3E Signal Monitor will then display the appropriate fault status along with theproceed indications active at the time of the fault. The NSM-3E Signal Monitor will remain inthis fault mode until a reset command is issued via the front panel RESET button orExternal Test Reset Input. The loss of AC power will not reset the fault mode of the Outputrelay contacts. In the event of AC power loss the NSM-3E Signal Monitor will retain thestatus of all fault and channel indicators and will display the correct fault and channel statusupon restoration of AC power.1.2 CONFLICT MONITORINGThe NSM-3E Signal Monitor is capable of monitoring 3 channels. Each channel monitors aRed, Yellow, Green, and Walk field signal output at the field terminals. The NSM-3E SignalMonitor detects the presence of conflicting Green or Yellow or Walk signals on the AC fieldterminations between any two or more channels. The monitoring circuitry is capable ofdetecting either full wave or positive and negative half-wave field signal outputs at thespecified voltage levels. Upon detecting a Conflict fault, the NSM-3E Signal Monitor willenter the fault mode, de-energize the Output relay contacts to the Fault position, andilluminate the CONFLICT indicator.1.3 RED FAILURE MONITORINGWhen voltages on all inputs (R, Y, G, and W) to a channel are sensed as inactive for morethan 1000 msec, the NSM-3E Signal Monitor will enter the fault mode, de-energize theOutput relay contacts to the Fault position, and illuminate the RED FAIL indicator. The unitwill remain in the fault mode until the unit is reset by the Reset button or the External ResetEberle Design Inc.Page 1
NSM-3E Signal Monitor UnitOperations Manualinput. When voltages on all inputs to a channel are sensed as inactive for less than 700msec, the unit will not transfer the Output relay contacts to the Fault position.Red Failure Monitoring is disabled when the Red Enable input is not active.1.3.1 WALK DISABLE (RED MONITORING)This option will modify the operation of Red Monitoring on the NSM-3E Signal Monitor.When enabled, the Red Monitoring function will not monitor the Walk field outputs. Absenceof signals on the Green, Yellow, and Red field outputs of a channel will place the NSM-3ESignal Monitor into the fault mode causing the Output relay contacts to transfer. Thisfunction is enabled by the front panel option switch labeled "WALK DISABLE". See alsosection 2.2.2.1.4 VOLTAGE MONITORINGInputs are provided for monitoring two 24VDC supplies and the Controller Voltage Monitor(CVM) output from the controller. Should loss of proper signal occur at any of these inputs,the NSM-3E Signal Monitor will de-energize the Output Relay causing the two sets ofcontacts to transfer and will illuminate the appropriate front panel indicator(s). The Monitorwill automatically reset when the correct input signals are restored to these inputs if the unithad not already been triggered by a previous fault condition. A 24V Monitor Inhibit input isprovided to facilitate the use of these monitors with pre-timed mechanical controllerinstallations.1.4.1 VOLTAGE MONITOR FAULT LATCHWhen the 24V Latch option is enabled by the front panel switch labeled "24V LATCH", theabsence of the proper voltage level at either of the two 24VDC inputs (24V-I & 24V-II) willplace the NSM-3ESignal Monitor into the fault mode causing the Output relay contacts totransfer. The 24V-2 and / or the 24V-1 indicator(s) will be displayed on the Fault StatusDisplay along with the field output signals active at the time of the voltage fault. Restorationof the voltage levels will not reset the fault state of the Monitor. Only a Manual Reset orExternal Test Reset command will reset the Monitor.1.4.2 CVM FAULT LATCHWhen the CVM Latch option is enabled by the front panel switch labeled "CVM LATCH",the absence of the True state at the CVM Input will place the NSM-3E Signal Monitor intothe fault mode causing the Output relay contacts to transfer. The CVM indicator will bedisplayed on the Fault Status Display along with the field output signals active at the time ofthe voltage fault. Restoration of the True state will not reset the fault state of the Monitor.Only a Manual Reset or External Test Reset command will reset the Monitor.1.5 AC BROWN-OUT / INTERRUPTION DETECTIONWhen the AC line voltage is below the drop-out level for 475 msec ( 25 msec) the NSM3E Signal Monitor will suspend all fault monitoring functions, de-energize the Output relay,and de-energize the Start relay. The POWER indicator on the front panel will flash at a rateof 2Hz to indicate the brown-out status.When the AC line voltage returns above the restore level for 100 msec ( 16 msec) themonitor will resume normal operation and the POWER indicator on the front panel willremain illuminated. After a 2.5 second ( 1 second) delay the Start relay will be energized.After a programmable delay determined by the minimum flash function switches on thefront panel the Output relay will be energized.Eberle Design Inc.Page 2
NSM-3E Signal Monitor UnitOperations ManualSection 2Extended FeaturesThe following extended features are provided on the NSM-3E Signal Monitor for additionalmonitoring functions, and to increase the reliability of the NSM-3E Signal Monitor operation.2.1 HARDWARE FEATURESThe NSM-3E Signal Monitor is a microprocessor based unit. All monitoring functions andfeatures are firmware programmable which permits upgrades or modifications by simplyreprogramming the flash memory containing the firmware with the upgraded version. Thus,most changes to the NSM-3ESignal Monitor specifications may be accommodated withoutmodifying the hardware.Since all critical timing functions are accomplished by the microprocessor, the quartzcrystal based accuracy results in very precise and repeatable measurements. Thisaccuracy is maintained on functions from timing fault conditions to implementing a uniquefirmware based digital sampling and filtering algorithm. This algorithm is applied to all ACfield signals to help eliminate false detection in a "noisy" AC line environment.Input voltages are measured using a true Root Mean Squared (RMS) technique. Amicroprocessor based RMS-Engine controls the analog to digital (A/D) hardware whichsamples each AC input voltage a minimum of 32 times per cycle. The RMS-Engine thencalculates the true RMS voltage value producing accurate results which are virtuallyinsensitive to changes in frequency, phase, wave shape, and distortion. Voltagereferences are temperature compensated for constant voltage levels within the operatingtemperature range.A nonvolatile EEPROM is utilized to retain fault status information in the event of an ACLine power interruption. The correct fault indications will be displayed upon restoration ofAC Line power. This EEPROM nonvolatile memory requires no battery back-up. Nomonitor configuration programming is stored under battery power.2.2 DUAL INDICATION MONITORINGThis monitoring function detects simultaneous indications of active Green, Yellow, Walk,and Red field signal outputs on the same channel on the NSM-3E Signal Monitor. A DualIndication fault places the NSM-3E Signal Monitor into the fault mode causing the Outputrelay contacts to transfer. Dual Indication Monitoring is enabled concurrently withClearance Monitoring on a per channel basis via the front panel SSM switches.Dual Indication Monitoring is disabled when the Red Enable input is not active.NOTE: An open or no load condition (i.e., open field wire) may be detected as an activesignal depending on the output impedance characteristics of the load switch, and maycause a Dual Indication fault.2.2.1 GY-DUAL INDICATION MONITORINGThis monitoring function detects a simultaneous indication of active Green and Yellow fieldsignal outputs on the same channel. It can be used to monitor channels which have anunused Red field signal output tied to AC (i.e. five section signal head) and is enabled byplacing the front panel option switch labeled "GY ENABLE" in the ON position. A GY-DualIndication fault places the NSM-3E Signal Monitor into the fault mode causing the Outputrelay contacts to transfer. GY-Dual Indication Monitoring may be enabled concurrently withDual Indication Monitoring. When GY-Dual Indication Monitoring is enabled, ALL channelswhich have NOT been selected for Dual Indication Monitoring via the front panel SSMswitches will be individually monitored for simultaneous indications of active Green andEberle Design Inc.Page 3
NSM-3E Signal Monitor UnitOperations ManualYellow field signal outputs. Any channels which have been selected for Dual IndicationMonitoring by the SSM switches will function as described above in Section 2.2.GY-Dual Indication Monitoring is disabled when the Red Enable input is not active.2.2.2 WALK DISABLE (DUAL INDICATION MONITORING)This option will modify the operation of Dual Indication Monitoring on the NSM-3E SignalMonitor. When enabled, the Dual Indication monitoring function will not monitor the Walkfield outputs. This function is enabled by the front panel option switch labeled "WALKDISABLE". See also Section 1.3.1.2.3 CLEARANCE (SHORT OR ABSENT YELLOW) MONITORINGThis function detects the absence of a minimum 2.7 second period of an active Yellow fieldsignal output during a Green to Yellow to Red signal sequence. Clearance Monitoring isenabled concurrently with Dual Indication Monitoring on a per channel basis via the frontpanel SSM switches.Clearance Monitoring is disabled when the Red Enable input is not active.A Clearance (short or absent Yellow) fault condition will place the NSM-3E Signal Monitorinto the fault mode causing the Output relay contacts to transfer.2.4 RECURRENT PULSE DETECTION (RP STATUS)This error detection function supplements the normal Conflict, Dual Indication, and Red Failmonitoring algorithms for sensing faults which are intermittent or pulsing in nature. TheRMS-Engine is designed to filter out short term transients commonly found on the electricalservice and provide noise immunity against false signal detections. The Recurrent Pulsedetection function is designed to respond to fault conditions which are intermittent in natureand do not meet the continuous timing requirements of the normal detection algorithms, yetmay still produce improper signal displays. These input conditions are differentiated
NSM-3E Signal Monitor Unit Operations Manual Eberle Design Inc. Page 1 Section 1 Standard Functions 1.1 INTRODUCTION The NSM-3E Signal Monitor is a deviceused in a traffic controller assembly to monitor traffic signals at an intersection for conflicting proceed indications or the absence of voltage
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