cornell model nc-102d controller for 4000
Contents
1. Max continuous input current sinking during active state 500mA 24Vdc AXIN1 2 AUXILLIARY INPUTS FOR FUTURE PRODUCT ENHANCEMENTS Normal use not used at this time Input levels Idle Hi Z cathode of the diode in an opto coupler Active From 24Vdc or Hi Z to GND JU1 8 8 POSITION JUMPER BLOCK FOR FUTURE PRODUCT ENHANCEMENTS These 8 jumper selectable inputs are to be used for future product enhancements To activate the jumper definition the jumper MUST be moved from the left position to the right position as shown in Figure 1 1 JU1 active Figure 1 1 Jumper 1 JU1 is shown activated JU1 JU8 Jumper Definitions as of 04 03 01 JUL If this jumper is activated system diagnostics will be sent to the 4 pin RS232 header J2 JU2 8 These jumpers are undefined Revised 06 01 07 RDG page 4 52. mar CORNELL Emergency Response Systems CORNELL MODEL NC 102D CONTROLLER FOR 4000 amp 4500 SERIES DUAL TRIPLE STATUS NURSE CALL INSTALLATION amp SERVICE MANUAL CORNELL Communications Inc 7915 N 81 St Milwaukee WI 53223 www cornell com 800 558 8957 The purpose of this document is to aid the Installer or Service Person in properly installing and troubleshooting the NC 102D Controller within a Cornell Nurse Call System If this is your first Dual or Triple Status Cornell Nurse Call System it is suggested that you should read the entire manual in order to thoroughly familiarize yourself with this key component of the system This manual consists of the following sections TABLE OF CONTENTS Section 1 FUNCTIONAL DESCRIPTION Pages 1 1 1 4 This section will help you understand the terminology used within the NC 102D and theory of operation Section 2 CALIBRATION PROCEDURE Page 2 1 Procedure for field calibration of NC 102D Section 3 INSTALL TROUBLESHOOTING GUIDE Pages 3 1 3 8 Provides guidance in troubleshooting NC 102D related problems Section 5 TERMINAL DEFINITIONS Pages 4 1 4 5 Describes intended function and limitation of each NC 102D Termination Revised 06 01 07 RDG page A CORNELL MODEL NC 102D FUNCTIONAL DESCRIPTION The purpose of this document is to aid the Installer Service Person or Designer in understanding the purpose and function of the NC 102D Controller within a Cornell
3. 102D Controllers are equipped with a self resetting Thermal Overload device miniature F1 socket near GND Terminal This device automatically shuts down the NC 102D when excessive total current is detected and restores power once it cools down If the NC 102D is experiencing excessive load this device could cause the cycling o Older NC 102D Fuse Older NC 102D Controllers have a small rectangular fuse at this position Check the fuse continuity with a meter and replace if needed o Ineither case be sure to verify that field loads are not excessive or that some sort of short ground fault does not exist before replacing the NC 102D overload or fuses e If ALL OF ONE TYPE OF STATION example ALL Bed Stations ALL Bath Stations experiences such intermittent failures Load Test the associated Current Sensing Output Actuate multiple stations while measuring current draw and ensure that the maximum current is not being exceeded Approx Overload of the NC 102D Refer to Cornell Model NC 102D Pin Definitions e Overheating Components Have any components become disconnected from their associated heat sink The NC 102D has at least 14 Solid State devices with Heat Sinks Look for Missing Lost clip or screw Voltage regulators and transistors can overheat which can cause temporary shutdown once they cool down the Controller or a particular Output resumes operation Similar events can happen when
4. Bed Stations Steady Negative Output levels Idle Hi Z open collector Active GND Maximum continuous input current sinking during active state 3 5A 24Vdc Input level Minimum Trigger Current 25mA per detectable call change F MIDDLE PRIORITY CURRENT SENSING OUTPUT F FLASH Normal use Negative Feed for Bath Stations Flashing Negative at 1Hz Output levels Idle Hi Z open collector Active 1Hz to GND 50 duty cycle Maximum continuous input current sinking during active state 3 5A 24Vdc Input level Minimum Trigger Current 25mA per detectable call change P HIGHEST PRIORITY CURRENT SENSING OUTPUT P PRIORITY Normal use Negative Feed for Code or Smoke Detector Flashing Negative at 2Hz Output levels Idle Hi Z open collector Active 2Hz to GND 50 duty cycle Maximum continuous input current sinking during active state 3 5A 24Vdc Input level Minimum Trigger Current 25mA per detectable call change Revised 06 01 07 RDG page 4 2 CORNELL MODEL NC 102D CONTROLLER PIN DEFINITIONS SCREW TERM DESCRIPTION OUTPUTS INPUTS FOR AUDIBLE INDICATION SOUNDER OPERATION The following two Outputs and one Input are used to drive the sounders that are built into Cornell Dual Status Annunciators and Dual Status Duty Stations HI SOUNDER DRIVER NON MUTABLE OUTPUT Normal use Positive Sounder output to Dual Status Annunciators amp Duty Stations Fun
5. Controller within a Cornell Nurse Call System This document incorporates tips and symptoms that have been observed by Cornell Technical Support over the past years allowing you to learn from others mistakes and saving you time and money FIRST THINGS FIRST First before installing or servicing an NC 102D Controller it helps to understand the function and features of the Controller The following documents are part of the NC 102D Installation Manual and are also available via Cornell s website www Cornell com e NC 102D Functional Description e NC 102D Calibration Procedure e NC 102D Pin Definitions Second ensure that you have the correct installation drawings for the particular system being installed serviced If you don t have them obtain them from Cornell s website before heading to the jobsite Third if the problems does not encompass the entire system or ALL of a particular station type the source of the problem is probably not the NC 102D Lastly keep an open mind sometimes what appears to be the problem is actually a Symptom of the problem REPLACING A COMPONENT WITHOUT FIRST ATTEMPTING TO FIND OUT WHY IT FAILED OFTEN RESULTS IN THE SAME COMPONENT BECOMING BLOWN AGAIN POWER SUPPLY RELATED PROBLEMS AND TROUBLESHOOTING Although the Power Supply is a different component from the NC 102D power supply problems are often mistaken for NC 102D problems This section of the Troubleshooting
6. Nurse Call System OVERVIEW The NC 102D Controller is the functional core of a dual or triple status Nurse Call System It is normally used in conjunction with Cornell 4000 Series and 4500 Series Dual Status products The NC 102D controls Audible amp Visible indication of the different call priorities within a system Audible Indication The NC 102D ensures that only the highest priority that is present is audibly indicated at sounders that are built into the Annunciators and Duty Stations Visible Indication The NC 102D generates the different flash rates that are used to indicate the various call priorities via Annunciator and Duty Station LEDs and Dome Lights Zone Lights Cornell 4000 and 4500 Series Nurse Call Systems utilize a Common Positive wiring operation scheme this means that one side of every device Stations with LEDs or Electronic Latching Dome Lamps Annunciators Sounders etc is tied to the Positive side of the 24 Volt System Power Supply Indication and Control functions are accomplished by switching the Negative side of the system CALL PRIORITIES The NC 102D has the capability to identify and differentiate between 3 types of Cornell Defined system calls The 3 types of calls and their letter designations are described as follows PRIORITY 1 HIGH LETTER DESIGNATION P PRIORITY This type of call has the highest priority status and is usually used for Dwelling Unit Smoke Detectors Code
7. and Installation Guide deals with power supply problems and some tips that you can use in diagnosing and fixing such problems BE CAREFUL Dead and or Damaged Power Supplies are often the symptom of some other problem Check your field wiring and other components before simply replacing the power supply Otherwise you may simply end up with a second burned out power supply SYMPTOMS OF POWER SUPPLY RELATED PROBLEMS e System Totally Dead It s probably the Power Supply not the NC 102 e All system LEDs and Lamps function normally but All Annunciator Duty Station Sounders are not working Check Voltage e All Station Types Bed Stations and Bath Stations are experiencing the same problem particularly if lamps appear dim or if they fail to light once several stations are actuated Check Load Performance of Power Supply e System worked normally for a few hours a few days and then experienced problems check Primary AC and Batteries if so equipped if this is the case be sure to check Battery Problems and Failed after a few days hours near the end of this Guide continued on next page Revised 06 01 07 RDG page 3 1 CORNELL MODEL NC 102D INSTALL TROUBLESHOOTING GUIDE DEAD POWER SUPPLY Sometimes it s the simple things that get overlooked e Check the Circuit Breaker Measure incoming Primary AC If it s not there it s only natural that the system is not working If the brea
8. can use in diagnosing and fixing the problem Once the Power Supply has been eliminated as the source of a system level problem the next place to start looking is logically the NC 102D Controller and its associated circuits IS THE PROBLEM WITH THE NC 102D OR IS IT A FIELD PROBLEM This is the next logical question to ask use the following procedure to diagnose answer this question e QUICK FIELD TEST OF NC 102D UNIT In order to quickly find out if the NC 102D is functioning properly perform the following steps 1 Obtain borrow a dome lamp and sounder best get a single 24 Volt bulb with socket amp wires and a Dual Status Duty Station that you know is good and use them only for testing Disconnect ALL field wiring from the NC 102D Only leave the following connected e HI or NSTN connection to ONE Annunciator or Duty Station Sounder make sure that the Annunciator Duty Station has incoming 24VDC e Incoming 24 VDC power from the power supply 24V amp GND terminals e Earth ground CH Terminal 3 Re Calibrate the NC 102D Refer to NC 102D Calibration Procedure document Test the S Low Routine Priority Current Sensing Output as follows A Place one lead of the Lamp on the 24V Terminal B Place the other Lamp Lead on the S Terminal Once you do this the following should occur C The Lamp and the LED at the S Terminal should illuminate i
9. charge the batteries properly after which certain functions fail CYCLICAL FAILURE INTERMITTENT OPERATION Where the power supply appears to operate properly for a few hours days at a time with unexplained shutdowns in between the source of the problem is usually related to one of the following e Overload of the system e Overheating component s e AC Power fluctuations brown outs In such cases Cornell recommends that you should check for the following e Is the Power Supply Big Enough A typical Patient Room will draw approximately 100 mA of current 0 1 Amp due to the internal circuitry of the station and Station Annunciator LEDs o A 1 Amp Power Supply will be able to simultaneously operate approximately 7 10 single lamp rooms Fewer if dual triple lamps and or Zone Lamps are used o A3 Amp Power Supply will be able to simultaneously operate approximately 25 30 single lamp rooms Fewer if dual triple lamps and or Zone Lamps are used o Onatypical system the power supply should be sized adequately to permit the number of stations worst case that are expected to be active at any given time This would be at least 10 of the entire system per UL requirements but 25 to 33 percent is usually more realistic Note Local Code project specifications may have different requirements o Ask the Nursing Staff to note Peak Number of Calls amp Peak Times They will usually have a good unde
10. in the Annunciator connect the TO Terminal of each additional board to the Tone Terminal where the resistor was added parallel them together e This will add approximately 25 mA of current draw any time any Station is actuated C2 If your system USES Z 103 or Z 203 Zone Lamps or if you ADDED OR REMOVED Zone Lamps make sure that the NC 102D has been re calibrated If it has not been the system may operate in a tripped mode all of the time or may spuriously trip due to minor current fluctuations See Cornell Model NC 102D Calibration Procedure C3 If the Rooms ARE WIRED IN A NORMAL CONFIGURATION Each Room has a Dome Lamp and if it takes multiple stations to trip Audible functions Check the field wiring particularly for shorts to Ground If Negative current can be drawn through ground it may bypass the Current Sensing ability of the NC 102D since in some cases the Negative side of the Power Supply is connected to Earth Ground CYCLICAL FAILURE INTERMITTENT OPERATION Perform the Quick Field Test procedure as outlined on the previous page If that test passes but the system NC 102D still appears to experience intermittent complete failures check the following Like the Power Supply the NC 102D provides a Negative Feed to all of the Stations As with the Power Supply If a power related problem is identified EFFORTS SHOULD BE MADE TO FIND AND FIX THE SOURCE OF
11. only when Type S calls are the only calls present on the system This can only occur Whenever the P Current Sensing Output is Idle AND Whenever the F Current Sensing Output is Idle AND When the S Current Sensing Output is Active e Audible Output Functions will be automatically Silenced Only when ALL 3 Current Sensing Outputs are Idle e Audible Output Functions automatically Escalate as higher priority calls are sensed and De Escalate as higher priority calls are cleared according to this priority scheme NON MUTABLE AUDIBLE OUTPUTS Non Mutable Audible Outputs operate in strict accordance with the Audible Indication Scheme outlined above Sounders that are connected to Non Mutable Audible Outputs will continue to produce Audible Signal Sounds until ALL Current Sensing Outputs are Idle MUTABLE AUDIBLE OUTPUTS Mutable Audible Outputs operate in the same manner as Non Mutable Audible Outputs with the following exceptions e Associated Mute Inputs are provided in order to permit operation of the Muting feature e Whenever a Mute Input is momentarily actuated the associated Mutable Output will be silenced e The Mutable Output will automatically re sound whenever a New Call occurs whenever the current draw sensed by ANY Current Sensing Output increases measurably e The Mute feature IS NOT currently utilized on any standard Cornell Nurse Call products Revised 06 01 07 R
12. Call Stations or Panic Alarms Audible Indication 2 Pulses per second Rapid Pulse 2Hz 50 duty cycle Visible Indication 2 Flashes per second Rapid Pulse 2Hz 50 duty cycle PRIORITY 2 MIDDLE LETTER DESIGNATION F FLASH This type of call has middle priority status and is usually used for Bathroom Pull String Stations Audible Indication 1 Pulse per second Slow Pulse 1Hz 50 duty cycle Visible Indication Flash per second Slow Pulse 1Hz 50 duty cycle PRIORITY 3 LOW LETTER DESIGNATION S STEADY This type of call has the lowest priority status and is usually used for Routine calls from Bedside Call Cord Stations Audible Indication 1 Pulse every 6 seconds Slow Pulse 1Hz 50 duty cycle Visible Indication 2 Flash per second Slow Pulse 1Hz 50 duty cycle CALL SENSING Three Current Sensing Outputs are incorporated into each NC 102D Controller One for each Priority Condition and designated by letters as defined above e P Current Sensing Output for High Priority Calls and their associated Stations e F Current Sensing Output for Mid Priority Calls and their associated Stations e S Current Sensing Output for Low Priority Calls and their associated Stations Revised 06 01 07 RDG page 1 1 CORNELL MODEL NC 102D FUNCTIONAL DESCRIPTION Each of these Current Sensing Outputs performs both an Output and an Input function as follows OUTP
13. DG page 1 3 CORNELL MODEL NC 102D FUNCTIONAL DESCRIPTION CALIBRATION FEATURE The NC102D has been equipped with a feature that allows the system to ignore any idle current devices connected to the system An idle current device is defined as any component connected to an S F or P Current Sensing Output which requires a current draw in order to operate in a deactivated state EXAMPLE CORNELL ZONE LIGHT The Z 103 senses current in the circuits that feed the portion of the system that it serves In order to perform this function it requires a small amount of current to operate its internal sensing circuits even when none of its associated lamps are illuminated Without the calibration procedure the Idle Current required by one or more such Zone Lights may be sensed by the Current Sensing Outputs which would create false call indication Once it is calibrated the NC 102D that serves this system will disregard the idle current caused by such devices and will then operate as follows Idle Current Trigger Current Indicate call for increase due to Trigger Current Refer to the Cornell Model NC 102D Calibration Procedure for more detailed information DIAGNOSTIC FEATURES In order to aid the installer or service personnel in installation and troubleshooting the NC 102D incorporates the following diagnostic features e LED Indicators are provided aligned with the Terminal Strip which indi
14. NNUNCIATOR DUTY DS10 GRN ON WHEN TONE OUTPUT IS ACTIVE S CURRENT SENSING OUTPUT DS11 RED LIT STEADY S ACTIVE F F CURRENT SENSING OUTPUT DS12 RED SLOW FLASH F ACTIVE P CURRENT SENSING OUTPUT DS13 RED FAST FLASH P ACTIVE CORNELL COMMUNICATIONS INC DATE May 31 2007 MILWAUKEE WI USA SYSTEM 4000 4500 MULTI STATUS NURSE CALL TITLE NC 102D TERMINAL DESIGNATIONS DRAWING 90016 07 SHEET 1 DWG JMS Revised 06 01 07 RDG page 4 1 CORNELL MODEL NC 102D CONTROLLER PIN DEFINITIONS PLEASE NOTE This document describes the operation and limitations of the various inputs and outputs of the Cornell Model NC 102D Controller which is used in conjunction with both 4000 Series and 4500 Series Nurse Call Systems The terminations that are used most frequently are marked with an asterisk SCREW TERM DESCRIPTION CURRENT SENSING OUTPUTS The following three Current Sensing Outputs S F amp P are somewhat unique in that each acts as both Output Signal Generator provides voltage source for associated stations devices and provides associated lamp flash functions Input Current Sensing When a station that is connected to one of these terminals is actuated the NC 102D senses the current draw load and based on which are active triggers appropriate outputs S LOWEST PRIORITY CURRENT SENSING OUTPUT S STEADY Nornal use Negative Feed for
15. THE PROBLEM BEFORE REPLACING THE FAILED COMPONENT Otherwise the problem is likely to be repeated Where the power supply has been eliminated as the source the following factors should be explored e Ifthe ENTIRE SYSTEM experiences such intermittent failures examine the Overload of the NC 102D Because the Nurse Call System is intended for Class 1 Operation as defined by NFPA 70 N E C it contains features that are designed to limit the amount of current that it can pass to approximately 100 VA 4 Amps at 24 VDC should be no more than 3 Amps with a single Cornell Power Supply Refer to Cornell Model NC 102D Pin Definitions o First Ask the Nursing Staff to note the Peak Number of Calls amp Peak Times They will usually have a good understanding of the call traffic patterns in their facility Ask them to note how many LEDs are lit up at their annunciator during the busiest times of the day for a week or so along with the time when this occurs then examine if the result may approach or exceed 3 to 3 5 Amps This is the approximate Incoming 24 Volt Maximum Current for an NC 102D and is also the maximum current for any single Current Sensing Output If this occurs on a regular basis Cornell suggests that the system should be split up into smaller more manageable sub systems Revised 06 01 07 RDG page 3 7 CORNELL MODEL NC 102D INSTALL TROUBLESHOOTING GUIDE o Newer NC 102D Thermal Overload Newer NC
16. UT FUNCTION SIGNAL GENERATOR Each Station used within the associated Nurse Call System derives Negative 24 Volt Power from one of the Current Sensing Outputs Each Current Sensing Output also provides a Signal Generator function which affects operation of the LEDs and Lamps associated with it e P PRIORITY OUTPUT o Associated Stations Smoke Detectors Panic Alarms or Code Blue Stations o Signal Generator Lights amp LEDs fed via this Output will Fast Flash at 2 Hz e F FLASH OUTPUT o Associated Stations Bathroom Pull Cord Stations o Signal Generator Lights amp LEDs fed via this Output will Slow Flash at 1 Hz e S STEADY OUTPUT o Associated Stations Bedside Patient Call Cord Stations o Signal Generator Lights amp LEDs fed via this Output will illuminate Steadily INPUT FUNCTION CURRENT SENSING Each Current Sensing Output has the capability to continuously monitor the amount of current that is drawn from it All other functions of the NC 102D depend upon this function e When no Stations or a particular type are actuated little or no current will be drawn from the associated Current Sensing Output This is defined as the Idle state e Whenever a Station or Detector is actuated a measurable increase in current will be detected via the associated Current Sensing Output This is defined as the Active state e In order to be sensed as Active a minimum amount of current nee
17. blem it is probably related to Field Wiring disconnect the wiring from the HI or NSTN Output and check for shorts to Earth Ground and to all other field wires Once you find a problem here you will have to systematically trace the system wiring in order to find the source of the problem LAMP FUNCTION ISSUES Did you check the Power Supply If not do that first then perform the Quick Field Test procedure as outlined previously If that test passes but you are still experiencing Dome Lamp Zone Lamp Function problems check the following L1 SYSTEM CAN ONLY HANDLE A FEW LAMPS Particularly if the project is a retrofit re using using Non Cornell Dome Lamps spot check a few Dome Lamp Light Bulbs e Cornell uses Type 1820 bulbs that are rated for 28 Volts 100 mA 0 1A If your system is all Cornell and needs to be UL Listed you need Cornell Lamps e If you find bulbs that are not Type 1820 Obtain a copy of the specifications for such bulbs from the manufacturer or check the current draw on a single bulb If it varies significantly from the 1820 Bulb specifications you probably need to replace ALL bulbs and or Dome Lamps Too much current draw can limit operational capacity of the system while too little can affect Current Sensing operation e Ifthe bulbs are OK then there may be a problem in the field wiring associated with the Dome Lamps check for wire to wire shorts and wire to Gro
18. cate the Active State of the associated Inputs and Outputs The NC102D also has a full RS232 diagnostic screen output for system troubleshooting This feature is reserved for internal use by Cornell Communications Inc and for particular custom configurations Revised 06 01 07 RDG page 1 4 CORNELL MODEL NC 102D CALIBRATION PROCEDURE WHEN SHOULD CALIBRATION BE PERFORMED A NEW SYSTEM INSTALLATIONS Cornell recommends that the Calibration procedure should be performed for new systems regardless of the equipment used in the system B IDLE CURRENT ON S F OR P The NC 102D will require calibration when there will be any idle current on any of the Current Sensing Outputs P F or S with no calls entered into the system An example of idle current is when one or more Cornell Z 103 zone lights are installed in the system The circuitry within the Z 103 draws current even when no lights are illuminated C ADDITIONS CHANGES TO AN EXISTING SYSTEM If Z 103 Zone Lights or other idle current devices are added to an existing system or removed or if the NC 102D replaces an older model controller re calibration will be necessary WHAT SWITCHES ARE USED IN THE CALIBRATION PROCEDURE The following descriptions assume that the NC 102D is mounted with e 14 Position Terminal Strip at Bottom e Large Integrated Circuit Chip at Top The following two switches will be utilized e S1 Sliding CAL s
19. connection with some other wiring S4 The Sounder Board within the Annunciator or Duty Station may be bad Connect ONLY ONE Annunciator or Duty Station Sounder that you know works to the HI output of the NC 102D it s best to do this right at the NC 102D eliminating the field wiring and repeat the Quick Field Test procedure as outlined on the previous page e If this fails there is probably a problem with the HI or NSTN Output of the NC 102D e If this passes move on to Step S5 Revised 06 01 07 RDG page 3 5 CORNELL MODEL NC 102D INSTALL TROUBLESHOOTING GUIDE S5 You may be exceeding the load capability of the NC 102D Sounder Output Both the HI and NSTN Outputs are designed for a maximum current draw of approximately 500 mA If the installation has several Annunciators and or Duty Stations check the following e If there are only a few Annunciators and Duty Stations check them one at a time One bad unit may be causing excessive load preventing the others from working properly e If there are many Annunciators and or Duty Stations the combined load on the HI or NSTN Output may be exceeding the capability of that output Measure the DC Current if it s excessive or borderline disconnect a few Duty Stations Annunciators If doing so fixes the problem you may need to find a way to make the change permanent S6 If Steps S1 thry S5 do not diagnose the pro
20. ction When the minimum trigger current is sensed at any of the Current Sensing Outputs the NC 102D determines the highest priority present and actuates the corresponding tone pulse pattern via HP These tone pulse patterns are as follows P Priority Smoke Code HI 2 pulses per second to tone boards F Flash Bath Call HI 1 pulse per second S Steady Routine Call HI 1 pulse every 6 seconds The output patterns continue to be produced until all stations at each priority level are manually reset As high priority calls are cleared the pulse pattern will de escalate example if calls at all three priority levels are present When all Code Call Stations are cleared the Bath Tone will be produced When all Bath Stations are cleared the Routine Call Tone will be produced When all Bedside Stations are cleared the output will be silenced Output levels Idle GND through a 3 0K 1 2W resistor Active 24Vdc gated 2KHz 50 duty cycle signal Maximum current supplied source during active state 500mA 24Vdc NSTN NURSE STATION SOUNDER DRIVER MUTABLE OUTPUT Normal use Negative Sounder output for Dual Status 4500 Series Systems Function This output operates in a similar manner to the HI Output see above except that it produces a switched Negative and is mutable see TMIN below The pulse patterns are the same Output levels Idle Hi Z open collector Activ
21. d to be replaced Revised 06 01 07 RDG page 3 2 CORNELL MODEL NC 102D INSTALL TROUBLESHOOTING GUIDE BATTERY PROBLEMS BATTERY CONFIGURATION ERRORS If a new Power Supply contains Batteries ensure that they are properly configured Where any Power Supply contains Batteries test them to make sure that they are good If you work with sealed Gell Cell Immobilized Electrolyte Batteries on a regular bases Cornell suggests that you should purchase an Electronic Battery Load Tester Measuring Voltage is OK but sometimes cells that put out proper voltage when measured fail when under load Some symptoms of Battery Problems are as follows e Total System Failure If system resumes normal operation when batteries are disconnected check for cells that are internally short circuited e The System functions for a day or two then experiences total failure e The lights and LEDs function normally but the Sounder Audio is not working In the last two cases particularly new systems or where a new Battery Back Up Power Supply has been installed the batteries may be wired properly but the Power Supply is either e Turned off Breaker Off Tripped Unit ran on batteries until they either went dead or the voltage dropped too low e Set at Wrong Voltage If Power Supply is set for 12 Volts but Batteries are at 24 Volts the system probably ran on battery until they dropped to about 12 Volts charger circuits unable to re
22. ds to be drawn from each Current Sensing Output This is defined as the Minimum Trigger Current e Lastly certain types of devices when connected to the system will cause a small amount of current to be continuously drawn from the Current Sensing Outputs that are used within the system This situation will be referred to as Idle Current In order to ignore such Idle Current loads a Calibration function has been designed into the NC 102D VISIBLE INDICATION On Nurse Call Systems that are equipped with NC 102D Controllers Visible Indication is accomplished via Annunciator LEDs and via Corridor Dome Lamps and Zone Lamps For Most Annunciators a single LED will be provided for each room which illuminates according to the Signal Generator Output Functions as described above Steady Slow Flash or Fast Flash Proper operation of these LEDs depends upon the stations being properly interconnected as shown in the proper typical dual or triple status Cornell Wiring Diagrams Where Single Corridor Dome Lamps are used they are usually interconnected to the same circuits that drive the Annunciator LEDs and behave in the same manner Where Multi Lamp Corridor Dome Lamps and Zone Lamps are used they are usually wired such that a separate lamp sometimes color coded is utilized for each status condition being used In this case multiple status conditions can be indicated simultaneously Additional Visible Indication Outputs are
23. e GND Max continuous input current sinking during active state 500mA 24Vdc TMIN TONE MUTE INPUT WORKS IN CONJUNCTION WITH NSTN ABOVE No current Standard Cornell Annunciators are designed to utilize this input This input controls the nurse station tone output NSTN If this input is activated the NSTN output will go into the idle state until another call is entered into the system Input levels Idle Hi Z Active Pulse from 5Vdc to GND for a 10ms duration max Revised 06 01 07 RDG page 4 3 CORNELL MODEL NC 102D CONTROLLER PIN DEFINITIONS SCREW TERM DESCRIPTION DUTY STATION LED OUTPUTS Since Cornell Duty Stations are equipped with two LEDs and the NC 102D is capable of supporting up to three different unique status condition indications the following four outputs allow installers to select the desired operation of the Duty Station LEDs If Dual Status Duty Stations are being used pick two of these that best fit your application DN DUTY NORMAL OUTPUT Normal use Indication of Routine Bed Station Status Conditions If the S Current Sensing Output is active this output is active GND Output levels Idle Hi Z open collector Active GND Max continuous input current sinking during active state 500mA 24Vdc DE DUTY EMERGENCY OUTPUT Normal use Combined Indication of both Bath and Code Smoke Status Conditions If any F or P Current Sensing Outputs are active th
24. is output will flash at the rate corresponding to the cadence of the highest priority P 2Hz or F 1Hz Output levels Idle Hi Z open collector Active P 2Hz to GND 50 duty cycle or F 1Hz to GND 50 duty cycle Max continuous input current sinking during active state 5 00mA 24Vdc DF DUTY FLASH OUTPUT Normal use Indication of Bath Emergency Status Conditions where P is not used If the F Current Sensing Output is active this output is active 1Hz Output levels Idle Hi Z open collector Active 1Hz to GND 50 duty cycle Max continuous input current sinking during active state 5 00mA 24Vdc DP DUTY PRIORITY OUTPUT Normal use Indication of Code Smoke Status Conditions where F is not used If the P Current Sensing Output is active this output is active 2Hz Output levels Idle Hi Z open collector Active 2Hz to GND 50 duty cycle Max continuous input current sinking during active state 5 00mA 24Vdc Revised 06 01 07 RDG page 4 4 CORNELL MODEL NC 102D CONTROLLER PIN DEFINITIONS SCREW TERM DESCRIPTION AAUX ALARM AUXILLIARY OUTPUT Normal use General Alarm Output for supplemental indication or interface to other systems relay driver etc If any S F or P priority calls are in the system this output is active GND Output levels Idle Hi Z open collector Active GND Steady this output DOES NOT match F P cadence
25. ker was turned Off you have probably found the problem If it was tripped you are probably on the trail of some greater problem e If 120 VAC most of U S A IS present o Check any fuses overload protection associated with the Power Supply refer to instructions for particular power supply o Try Disconnecting the Batteries If so equipped batteries sometimes experience internal Short Circuiting When the charger circuits attempt to charge shorted batteries this sometimes causes overload protection to kick in causing shutdown If this is the case replace the batteries always date mark new batteries o Try disconnecting the Supply s DC output Many power supplies use foldback output protection When an overload or short occurs on the output the unit shuts down If disconnecting the field wiring appears to restore operation one of two cases is likely An overload or short circuit is present in the system downstream of the power supply more testing will be needed to find it Ifthe Power Supply fails under load something may be wrong with it or with it s overload protection circuitry However even if you know that the power supply is bad it is almost always prudent to check the remainder of the system for unusual loads and for shorts and ground faults before replacing it e Ifahigher Voltage 208 220 VAC is present ensure that the power supply was intended to operate on this AC vol
26. mimic this as well E If this happens the F Current Sensing Output is good If not the NC 102D is probably bad and should be repaired or replaced Also refer to Cornell Model NC 102D Controller Pin Definitions for more information If the ALL steps of the Quick Field Test see previous page pass then the NC 102D is probably working properly and the problems are most likely due to Field Wiring or failure of some other component Skip to the appropriate section based upon the type of problem you are experiencing SOUNDER FUNCTION ISSUES Perform the Quick Field Test procedure as outlined above If that test passes but you are still experiencing Sounder Function problems check the following S1 NO SOUND Check the Volume Control if it has one make sure that it has not been turned too far down Sometimes users make unauthorized adjustments S2 NO SOUND AND SYSTEM DOES NOT USE DOME LAMPS Assisted Living etc The problem may be a Current Sensing Issue See Current Sensing Issues section S3 CONTINUOUS SOUND Whenever Sounder is connected to NC 102D Check the following e NC 102D not calibrated particularly if you have Z 103 Z 203 Zone Lamps If it is not calibrated the quiescent current draw of these can cause false tripping of the sounders e Bad Sounder Sounder Board in Annunciator Duty Station e Stray Voltage on HI wiring caused by cross
27. n a steady manner D The Annunciator Sounder should Chirp once every 6 seconds The HI and NSTN LEDs at the Outputs should mimic this as well E If this happens the S Current Sensing Output and associated logic is good If not the NC 102D is probably bad and should be repaired or replaced Revised 06 01 07 RDG page 3 4 CORNELL MODEL NC 102D INSTALL TROUBLESHOOTING GUIDE 5 Test the F Mid Bath Priority Current Sensing Input as follows A Place one lead of the Lamp on the 24V Terminal B Place the other Lamp Lead on the F Terminal Once you do this the following should occur C The Lamp and the LED at the F Terminal should flash once per second D The Annunciator Sounder should beep once per second The LEDs at the HI and NSTN Outputs should mimic this as well E If this happens the F Current Sensing Output and associated logic is good If not the NC 102D is probably bad and should be repaired or replaced 6 Test the P High Priority Current Sensing Input as follows A Place one lead of the Lamp on the 24V Terminal B Place the other Lamp Lead on the P Terminal when you do this the following should occur C The Lamp and the LED at the P Terminal should flash rapidly twice per second D The Annunciator Sounder should beep twice per second The LEDs at the HI and NSTN Outputs should
28. provided for use in conjunction with Duty Stations These are intended to cover the particular combination of priorities present in each system Revised 06 01 07 RDG page 1 2 CORNELL MODEL NC 102D FUNCTIONAL DESCRIPTION AUDIBLE INDICATION SCHEME On Nurse Call Systems that are equipped with NC 102D Controllers Audible Indication is accomplished via Piezo Sounders or Tone Boards that are built into Annunciators and Duty Stations The NC 102D contains several Outputs and Inputs that are intended for Audible Indication Functions Actuation of these outputs depends upon calls sensed via the Current Sensing Outputs The NC 102D simultaneously monitors all three of the Current Sensing Outputs Based upon internal control logic functions the Audible Output Circuits only respond to the highest priority status condition that is present at any given time e The P Priority Audible Output Function will take precedence over any F or S Audible Output Functions This occurs Whenever the P Current Sensing Output is Active regardless of any other Current Sensing Output e The F Flash Audible Output Function will take precedence over any S Audible Output Function This occurs Whenever the P Current Sensing Output is Idle AND When the F Current Sensing Output is Active regardless of the state of the S Current Sensing Output e The S Steady Audible Output Function will occur
29. rstanding of the call traffic patterns in their facility Ask them to note how many LEDs are lit up at their annunciator during the busiest times of the day with the associated time for a week or so and see if there is a corresponding pattern Revised 06 01 07 RDG page 3 3 CORNELL MODEL NC 102D INSTALL TROUBLESHOOTING GUIDE e Have any components become disconnected from their associated heat sink Missing Lost clip or screw Voltage regulators and transistors can overheat which can cause temporary shutdown once they cool down the power supply resumes operation Similar events can happen when such components are failing e Is there any sort of problem with the AC Circuit that feeds the Power Supply Although this is not common it DOES happen In particular be aware of arrangements where the circuit or phase within the breaker panel also feeds some sort of high current load If this is the case find out if there is any time correlation between system failures and when such high current loads are feeding the Power Supply NC 102D PROBLEMS AND TROUBLESHOOTING The NC 102D is considerably more robust than the older NC 101 and NC 102A models that it replaced However from time to time failures do occur and failures problems with other system components can and do affect the NC 102D This section of the Troubleshooting and Installation Guide deals with problems that are directly related to the Controller itself and some tips that you
30. such components are failing but remember If a component is properly heat sinked and still overheats the overheating may be a symptom of some other problem Revised 06 01 07 RDG page 3 8 CORNELL MODEL NC 102D CONTROLLER PIN DEFINITIONS CALIBRATE SWITCH S1 F g CAL Jul SSSSSs es a g NOT USED o m 6 poo DS1 DS2 pe a LARGE peo DIAGNOSTIC LED I C CHIP d NC 102D CIRCUIT BOARD RESET BUTTON Salans BUTTON FUSE OLDER VERSIONS _ THERMAL OVERLOAD A Self Resetting Breaker Fl Eee lee FREER EE E OO O G Oo 4 4 DIAGNOSTIC LED S CH GND 24V NSIN TMIN AAUX DP DF DN DE HI S F P GSSVPSSSPVSPSVVVssys DIAG TERMINAL DESCRIPTION LED NORMAL OPERATION OF ASSOCIATED LED DS1 GRN ON 5V INTERNAL POWER IS OK DS2 RED REFER TO CALIBRATION PROCEDURE CH CHASSIS GROUND NONE GND POWER SUPPLY GROUND NONE 24V POWER SUPPLY 24VDC DS3 GRN ON WHEN 24 VDC IS PRESENT NSTN NURSE STATION TONE NOT USED DS4 GRN ON WHEN TONE OUTPUT IS ACTIVE TMIN TONE MUTE IN NOT USED NONE AAUX ANY CALL AUX OUT DSS GRN ON WHEN ANY CALL IS ACTIVE DP P CALL SIGNAL DS6 GRN FAST FLASH ON ANY P TYPE CALL DF F CALL SIGNAL DS7 GRN SLOW FLASH ON ANY F TYPE CALL DN S CALL SIGNAL DS8 GRN LIT STEADY ON ANY S TYPE CALL DE F OR P CALL SIGNAL DS9 GRN FLASH AT F P RATE HIGHEST ACTIVE HI TONE A
31. tage Most Commercial Lighting Circuits operate on 208 or 220 VAC while outlets are on 120 VAC Most Cornell Power Supplies are not designed for 208 220 you probably need to replace the power supply after obtaining a proper 120 VAC feeder for it WRONG OUTPUT VOLTAGE ALL Cornell 4000 and 4500 Series Nurse Call Systems are designed to operate on 24 Volts DC Measure the Power Supply Output Voltage and observe the following e Approximately 23 to 28 Volts is acceptable depending upon how far the power supply is from the measurement location If your measurement is significantly different check the following o Make sure that the Power Supply is set at the correct Voltage Most recent Cornell Power Supplies are configurable for both 12 and 24 Volt operation if you are getting 12 Volts set it for 24 See Power Supply Instructions o Older Cornell Linear Power Supplies these have Big Transformer sometimes utilized center tapped transformers two 12 Volt secondary windings rather than one 24 Volt If one winding goes bad the supply output is affected you will probably measure approximately 12 Volts DC with significant AC ripple o If the Voltage is too high over approximately 28 Volts Attempt to adjust the output Voltage Some Cornell Power Supplies are equipped with trim potentiometers for this purpose Ifthe Output Voltage cannot be adjusted the regulator circuitry may be bad and the Power Supply may nee
32. und shorts L2 If there is a problem with the proper function of all dome lamps or with all lamps associated with a particular station type then there is probably some sort of a Field Wiring problem wiring to S F P Current Sensing Outputs shorted together wiring landed to wrong output or stations mis wired CALL SENSING ISSUES Perform the Quick Field Test procedure as outlined previously If that test passes but the system NC 102D does not seem to properly respond to active calls check the following C1 If your system LACKS DOME LAMPS Assisted Living etc the NC 102D may not be seeing the required Minimum Trigger Current To fix this situation try the following e If your system is Cornell 4000 Series do the following o Atone of the LED boards in the Annunciator ADD a 1 K Ohm 2 Watt Resistor between the TONE Terminal and the 24V Terminal Revised 06 01 07 RDG page 3 6 CORNELL MODEL NC 102D INSTALL TROUBLESHOOTING GUIDE o If there is more than one LED Board in the Annunciator connect the TONE Terminal of each additional board to the Tone Terminal where the resistor was added parallel them together e If your system is Cornell 4500 Series Voice System with Handset do the following o Atone of the LED boards in the Annunciator ADD a 1 K Ohm 2 Watt Resistor between the TO Terminal and the 24V Terminal o If there is more than one LED Board
33. witch located at Top Center of circuit board e S2 Small Momentary Pushbutton RST located at Top Left of circuit board Near jumper block CALIBRATION PROCEDURE Follow the following steps EXACTLY in order to calibrate the NC 102D Controller l CHECK SYSTEM FOR ACTIVE CALLS Make sure there are no active calls in the system 2 SET S1 Move the sliding switch S1 labeled CAL to the right AWAY from the adjacent Red LED PRESS AND RELEASE S2 Momentarily press the system reset switch S2 labeled RST 4 OBSERVE RED DIAGNOSTIC LED DS located adjacent to Switch S1 After Switch S2 is released LED DS2 should perform the following sequence of events e Initially it will illuminate in a Steady manner for a few seconds e It will start blinking rapidly you will clearly see the on off flashing this flashing indicates that system calibration is complete 5 TURN CALIBRATION SWITCH S1 OFF Move the sliding switch S1 labeled CAL to the Left TOWARDS the adjacent Red LED 6 OBSERVE RED DIAGNOSTIC LED DS2 Same Red LED as before After Switch S1 is turned off this LED should also turn off END OF PROCEDURE The NC102D system is now ready for operation Revised 06 01 07 RDG page 2 1 CORNELL MODEL NC 102D INSTALL TROUBLESHOOTING GUIDE The purpose of this document is to aid the Installer or Service Person in properly installing and troubleshooting the NC 102D
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