Edi 210 series User manual

THIS MANUAL CONTAINS TECHNICAL INFORMATION FOR THE MODEL 210; PCB Issue G.

INCLUDED ARE GENERAL DESCRIPTION, OPERATIONAL DESCRIPTION, INSTALLATION,

AND SPECIFICATIONS.

THE 210 SERIES SIGNAL MONITOR UNIT IS DESIGNED AND MANUFACTURED

IN THE USA BY EBERLE DESIGN INC., PHOENIX, ARIZONA, AN ISO 9001:2008 REGISTERED

COMPANY. INFORMATION CONTAINED HEREIN IS PROPRIETARY TECHNICAL

INFORMATION OF EBERLE DESIGN INC. PUBLICATION, REPRODUCTION OR USE IN WHOLE

OR PART IS NOT PERMITTED EXCEPT UNDER TERMS AGREED UPON IN WRITING.

REVISION: SEPTEMBER 2014

pn 888-0210-003C

Serial Number

CALTRANS

MODEL 210 SERIES

RMS Signal Monitor

Operations Manual

MAINTENANCE NOTE

EBERLE DESIGN INC. SIGNAL MONITORS HAVE BEEN CAREFULLY INSPECTED

AND TESTED TO ENSURE PROPER OPERATION. IT IS RECOMMENDED THAT THE

SIGNAL MONITOR BE TESTED AT LEAST ANNUALLY TO ENSURE COMPLIANCE

WITH THE PROPER SPECIFICATIONS.

- WARNING -

PIN 27 OF THE MAIN CONNECTOR (P6) PROVIDES THE CLOSED CONTACT OF

THE OUTPUT RELAY WHEN THE MONITOR IS IN THE NO-FAULT STATE. WHEN

THE MONITOR IS IN THE NO-FAULT STATE AND THE AUTO/FLASH SWITCH IS

IN THE FLASH POSITION, AC LINE VOLTAGE MAY BE PRESENT ON PIN 27.

THIS PIN WAS PREVIOUSLY DEFINED AS A “NO-CONNECT’ PIN IN LEGACY

EQUIPMENT. TO PREVENT POTENTIAL EXPOSURE TO ELECTRICAL SHOCK,

BEFORE INSTALLING THIS MONITOR THE USER IS CAUTIONED TO CHECK

THAT THE CABINET WIRING IS COMPATIBLE WITH THE USE OF THIS PIN AS A

SOURCE OF AC LINE VOLTAGE.

<blank>

 TABLE OF CONTENTS 
 
Section 1 GLOSSARY ........................................................................................................... 1 
Section 2 GENERAL DESCRIPTION..................................................................................... 2 
1 Basic Functions.....................................................................................................2 
1.1 Conflict Monitoring .........................................................................................2 
1.2 24VDC Monitoring..........................................................................................2 
1.3 Controller Watchdog Monitoring (WDT Error)................................................2 
Section 3 GENERAL CHARACTERISTICS........................................................................... 3 
1 Hardware Features................................................................................................3 
2 AC Line Brown-out Detection................................................................................3 
3 Non-Volatile Fault Memory....................................................................................3 
4 PCA (Program Card Absent) Indication.................................................................3 
5 Internal MPU Watchdog........................................................................................3 
6 Reset Input Detection............................................................................................4 
7 LED Test...............................................................................................................4 
8 Memory Test .........................................................................................................4 
9 Watchdog Monitoring Disabled Indicator...............................................................4 
10 Diagnostic Display Mode.....................................................................................4 
10.1 No-Fault Diagnostic Display.........................................................................4 
10.2 Fault Diagnostic Display...............................................................................5 
Section 4 INSTALLATION ..................................................................................................... 6 
1 Program Card Programming .................................................................................6 
2 Watchdog Programming........................................................................................6 
2.1 Watchdog Enable Switch...............................................................................6 
Section 5 FRONT PANEL DESCRIPTION............................................................................. 7 
1 Indicators...............................................................................................................7 
1.1 (G) AC POWER Indicator...............................................................................7 
1.2 (Y) VDC FAILED Indicator .............................................................................7 
1.3 WDT ERROR Indicator..................................................................................7 
1.4 CONFLICT Indicator ......................................................................................7 
1.5 PCA Indicator.................................................................................................7 
1.6 DIAGNOSTIC Indicator..................................................................................7 
1.7 CHANNEL STATUS Indicators......................................................................7 
2 Front Panel Controls .............................................................................................8 
2.1 RESET Button................................................................................................8 
Section 6 THEORY OF OPERATION .................................................................................... 9 
1 Introduction ...........................................................................................................9 
2 Main MPU Logic....................................................................................................9 
3 Serial Peripheral Interface (SPI)............................................................................9 
4 Internal MPU Watchdog........................................................................................9 
5 EEprom Memory ...................................................................................................9 
6 24Vdc Logic Inputs..............................................................................................10 

7 Display ................................................................................................................10 
8 Program Card and Switch Inputs.........................................................................10 
9 RMS-Engine........................................................................................................10 
10 Power Supply....................................................................................................10 
Section 7 MAINTENANCE................................................................................................... 11 
1 Trouble Shooting.................................................................................................11 
Section 8 SPECIFICATIONS................................................................................................ 13 
1 Electrical..............................................................................................................13 
1.1 Power Requirements....................................................................................13 
1.2 AC Voltage Monitors....................................................................................13 
1.3 DC Voltage Monitors....................................................................................13 
2 Timing Functions.................................................................................................13 
3 Mechanical..........................................................................................................13 
4 Environmental .....................................................................................................14 
Section 9 WIRING ASSIGNMENTS..................................................................................... 15 
1 Monitor Unit Connector (P6)................................................................................15 
2 Program Card Connector (P4) ............................................................................16 
3 Program Card Diagram.......................................................................................17 
Section 10 PARTS LIST....................................................................................................... 19 
Section 11 SCHEMATICS.................................................................................................... 23 
Section 12 ASSEMBLY DRAWING ..................................................................................... 32 
 

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 1

Section 1

GLOSSARY

A - Ampere

oC - Celsius

Component - Any electrical or electronic device

DC - Direct Current

DIP –Dual Inline Package

Firmware - A computer program or software stored permanently in PROM

FLASH –An IC Memory with nonvolatile, electrically erasable, programmable features

Hz - Hertz

IC - Integrated Circuit

Jumper - A means of connecting/disconnecting two or more conductive by soldering/desoldering a

conductive wire or by PCB post jumper

LED - Light Emitting Diode

LOGIC - Negative Logic Convention (Ground True) State

mA - milliAmpere

uH - microHenry

ms - millisecond

MCU - Micro Controller Unit

N.C. - Normally closed contact

N.O. - Normally open contact

PCB - Printed Circuit Board

RAM - Random Access Memory

RMS - Root-Mean-Square

ROM - Read Only Memory Device

s –second

Schmidtt Circuit –a circuit that provides hysterisis in the threshold

SW –Switch

uF - microfarad

VAC - Voltage Alternating Current

VDC - Voltage Direct Current

VRMS - Voltage Root Mean Square

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 2

Section 2

GENERAL DESCRIPTION

2.1 BASIC FUNCTIONS

The Signal Monitor is a device used in a traffic controller assembly to monitor traffic signals at an

intersection for conflicting proceed indications caused by malfunctions of the controller, load switches,

field wiring and loads, or miss-wiring of the cabinet. The Signal Monitor also provides error sensing of

the cabinet 24VDC supply and monitors the controller Watchdog output. The Signal Monitor is directly

interchangeable with a standard model 210 Signal Monitor and complies with all specifications outlined

in Chapter 4 (Model 210 Monitor Specifications) of the Caltrans Traffic Signal Control Equipment

Specifications (January 1989) and TEES March 12,2009.

When triggered by the detection of a fault condition which exists longer than the minimum period, the

Signal Monitor will enter the fault mode causing the Output relay contacts to close and enabling the

Stop-Time output to the controller. The cabinet assembly should be wired such that the closure of the

Output relay contacts will cause an automaticswitching of the field signal outputsfrom normal operation

to flashing operation. The Signal Monitor will then display the appropriate fault indications and will

remain in this fault mode until a reset command is issued.

2.1.1 CONFLICT MONITORING

The Signal Monitor is capable of monitoring 16 channels. Each channel consists of a Green and Yellow

field signal input. A Program Card is provided for assigning conflicting channels and inhibiting Yellow

monitoring for required channels. The Signal Monitor detects the presence of conflicting Green or

Yellow signals on the AC field terminations between any two or more channels assigned to conflict on

the Program Card. The monitoring circuitry is capable of detecting either full wave or positive and

negative half-wave field signal outputs at the specified voltage levels.

2.1.2 24VDC MONITORING

Sensing of the cabinet 24VDC supply is provided as specified in Section 4.2, Chapter 4 of the Caltrans

Traffic Signal Control Equipment Specifications. When the 24VDC input falls below the specified

voltage levels the Signal Monitor will enter the fault mode causing the Output relay contacts to close

and enabling the Stop-Time output to the controller. See Section 8.1.3.

2.1.3 CONTROLLER WATCHDOG MONITORING (WDT ERROR)

Sensing of the controller Watchdog output is provided as specified in Section 4.3 of the Caltrans Traffic

Signal Control Equipment Specifications. When a logic transition is not sensed for the specified period

(see Section 8.2) the Signal Monitor will enter the fault mode causing the Output relay contacts to close

and enabling the Stop-Time output to the controller.

An AC Line brownout condition will reset the WDT ERROR fault mode when the AC Line is restored.

The WDT Error indicator will remain illuminated until a Reset command is issued via the front panel

RESET button or External Reset input. This indicates to the technician that a WDT Error occurred but

was cleared by an AC Line brownout.

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 3

Section 3

GENERAL CHARACTERISTICS

3.1 HARDWARE FEATURES

The 210 series Signal Monitor is a dual microprocessor based unit. 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.

A nonvolatile EEPROM device is utilized to retain fault status information 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.

3.2 AC LINE BROWN-OUT DETECTION

When the AC Line voltage is below the "drop-out" level the Signal Monitor will suspend all fault

monitoring functions, close the Output relay contacts, and enable theStop-Time output to the controller.

The AC POWER indicator on the front panel will flash at a rate of 2Hz to indicate the brown-out status.

When the AC Line voltage returns above the "restore" level the monitor will resume normal operation

and the AC POWER indicator on the front panel will remain illuminated.

3.3 NON-VOLATILE FAULT MEMORY

The Signal Monitor stores the fault and channel indicator status at the time the fault occurs into a non-

volatile EEPROM device. Should an AC Line power interruption occur while the monitor is in the fault

mode, then upon restoration of AC Line power, the Output relay and Stop-Time output will remain in

the fault mode and the correct fault and channel indicators will be displayed.

3.4 PCA (PROGRAM CARD ABSENT) INDICATION

If the Program Card is absent or not seated properly in the edge connector, the Signal Monitor will enter

the fault mode causing the Output relay contacts to close and enabling the Stop-Time output to the

controller. The PCA indicator will illuminate to indicate this condition. A manual or external Reset is

required after the Program Card is properly seated.

3.5 INTERNAL MPU WATCHDOG

The Signal Monitor generates an internal watchdog pulse from its microprocessor. This occurs at least

once per cycle. If the internal hardware does not detect a watchdog pulse within approximately 325

milliseconds, the Signal Monitor will enter the fault mode causing the Output relay contacts to close

and enabling the Stop-Time output to the controller. The DIAGNOSTIC indicator on the front panel will

illuminate to indicate a monitor hardware and/or firmware failure. This type of failure is configured as

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 4

latching. With latching operation, only a loss of AC Line will restore operation. If the microprocessor

resumes operation the unit will not return to normal operation.

3.6 RESET INPUT DETECTION

A reset command from either the front panel Reset button or External Reset input will cause a one-time

reset command to the monitor. If the reset command is maintained longer than 500 milliseconds, the

monitor will resume monitoring functions and the Reset command will then provide input to the

Diagnostic Display mode (see Section 3.10).

3.7 LED TEST

The monitor will illuminate all front panel indicators for 500 milliseconds when a Reset command is

issued by the front panel Reset button or External Reset Input. This function provides a means to verify

the operation of all front panel indicators.

3.8 MEMORY TEST

The Signal Monitor verifies the proper operation of the memory devices (RAM, EPROM, & EEPROM)

required to operate the monitor. This test is performed when AC Line power is applied, a Reset

Command is issued to the monitor, and periodically during operation. If a memory error is detected, the

Signal Monitor will attempt to update the front panel display and then execute a STOP instruction. This

will cause the Output relay contacts to close and enable the Stop-Time output to the controller. The

DIAGNOSTIC indicator on the front panel will illuminate to indicate a monitor hardware and/or firmware

failure. Due to the nature of these hardware or firmware failures, other fault indicators that may be

concurrently illuminated may not be valid for trouble shooting purposes.

3.9 WATCHDOG MONITORING DISABLED INDICATOR

When the WDT ENABLE switch is in the OFF position to disable Watchdog Monitoring of the cabinet

Controller, or the AC Line voltage is below the Watchdog disable level, the Signal Monitor will flash the

WDT ERROR indicator on the front panel once every 2 seconds. This function informs the service

technician that the cabinet Controller Watchdog monitoring function is disabled.

3.10 DIAGNOSTIC DISPLAY MODE

The Signal Monitor provides two means of displaying the individual Green and Yellow field status. The

No Fault Diagnostic Display mode shows the individual colors while the monitor is not in the fault mode

(intersection operating). The Fault Diagnostic Display mode shows the individual colors that were active

at the time the monitor triggered to the fault mode (intersection in flash). The Fault Diagnostic Display

mode also provides a review of previous fault events.

3.10.1 NO-FAULT DIAGNOSTIC DISPLAY

When the Signal Monitor is not in the fault state, the unit can display the active Green and Yellow field

status individually. To enter this display mode depress and hold the Reset button. Each time the Reset

button is activated and held, the next set of colors will be displayed on the channel status indicators.

The display will continue to show the selected color as long as the Reset button is activated. This mode

only affects the monitor display and normal fault processing will continue to occur. The sequence is as

follows: Reset Fault Status LEDs Channel Status LEDs

#1 (G) AC POWER LED flashes Green field status 1-16

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 5

#2 (Y) VDC FAILED LED flashes Yellow field status 1-16

... (repeats back to top)

3.10.2 FAULT DIAGNOSTIC DISPLAY

Once the Signal Monitor has been triggered by a fault, the Green and Yellow field input status active at

the time of the current fault and the two previous faults may be displayed individually. This status is not

reset by an AC Line power interruption. To enter this display mode remove the Program Card. The

sequence is as follows:

Reset Event PCA LED Fault Status LEDs Channel Status LEDs

--- #1 Single flash Current Fault Status (newest) Current channel status

#1 #1 Single flash (G) AC POWER LED flashes Green field status 1-16

#2 #1 Single flash (Y) VDC FAILED LED flashes Yellow field status 1-16

#3 #2 Double flash Event #2 Fault Status Event #2 channel status

#4 #2 Double flash (G) AC POWER LED flashes Green field status 1-16

#5 #2 Double flash (Y) VDC FAILED LED flashes Yellow field status 1-16

#6 #3 Triple flash Event #3 Fault Status (oldest) Event #3 channel status

#7 #3 Triple flash (G) AC POWER LED flashes Green field status 1-16

#8 #3 Triple flash (Y) VDC FAILED LED flashes Yellow field status 1-16

... (repeats back to top)

To enter this display mode remove the Program Card. Depressing the Reset button advances the

display mode from the normal mode to the Green field input display. The (G) AC POWER LED will

pulse ON once per second to indicate this mode. The channel display LEDs will show the Green

channels active at the time of the fault. The PCA LED will pulse once per second to indicate the current

fault (#1, newest).

Depressing the Reset button again advances the display mode from the Green display mode to the

Yellow field input display. The (Y) VDC FAIL LED will pulse ON once per second to indicate this mode.

The channel display LEDs will show the Yellow channels active at the time of the fault.

Depressing the Reset button again advances the display mode from the Yellow display mode (of fault

#1) to the fault display mode for fault #2. The PCA LED will pulse twice per second to indicate the

previous fault (#2). Additional button closures will cycle through the colors for fault #2 and fault #3

(oldest). After the Yellow display for fault #3, the display will return to fault #1.

To exit this display mode, replace the Program Card. If the Program Card is removed while the Signal

Monitor has not been triggered by a fault, the fault status display mode will show the Green and Yellow

channels active when the Program Card was removed. If a PCA fault is displayed during the review,

the PCA LED will not flash during the Fault Status display step to indicate the fault number.

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 6

Section 4

INSTALLATION

4.1 PROGRAM CARD PROGRAMMING

The diode Program Card provides the means to assign non-conflicting channels and to disable sensing

of Yellow input signals. The card is initially supplied with 120 diodes mounted on the card. This permits

all channels to conflict with all other channels. To program a NON-CONFLICTING (permissive) channel

pair, remove the appropriate diode from the program card. To DISABLE sensing of a Yellow signal on

a channel, solder a wire jumper between the hole pairs labeled for that channel.

Example: If channel 2 Green or Yellow is permissive with channel 6 Green or Yellow, remove

the diode labeled "2-6". To disable Yellow signal sensing on channel 9, a jumper wire must be

soldered in between the pair of holes labeled "9" in the area designated "YELLOW DISABLE"

on the program card.

If the Program Card is removed or not seated properly in the edge connector, the Signal Monitor will

enter the fault mode causing the Output relay contacts to close and enabling the Stop-Time output to

the controller. The PCA indicator will illuminate to indicate this condition. A manual Reset is required

after the Program Card is properly seated.

4.2 WATCHDOG PROGRAMMING

4.2.1 WATCHDOG ENABLE SWITCH

The toggle switch SW2 labeled "WD ENABLE" provides control for the Watchdog Monitoring function.

When the switch is in the ON position, the Watchdog Monitoring function is enabled. When the switch

is in the OFF position, the Watchdog Monitoring function is disabled. The WDT ERROR LED will flash

once every two seconds to indicate that Watchdog Monitoring is disabled.

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 7

Section 5

FRONT PANEL DESCRIPTION

5.1 INDICATORS

5.1.1 (G) AC POWER INDICATOR

The AC POWER indicator will illuminate when the AC Line voltage level is above the brown-out

"restore" level. The indicator will flash at a rate of 2Hz when the AC Line voltage is below the "drop-

out" level. The indicator will extinguish when the AC Line voltage is less than 75 +_2 Vac.

If the Signal Monitor is in the Diagnostic Display mode, the (G) AC POWER indicator will flash ON once

per second to indicate the Channel Status display is showing Green channel status. See Section 3.10.

5.1.2 (Y) VDC FAILED INDICATOR

The VDC FAILED indicator will illuminate when a 24VDC fault condition is detected. This indicator

remains extinguished if the monitor has not been triggered by a 24VDC fault.

If the Signal Monitor is in the Diagnostic Display mode, the (Y) VDC FAILED indicator will flash ON

once per second to indicate the Channel Status display is showing Yellow channel status. See Section

3.10.

5.1.3 WDT ERROR INDICATOR

The WDT ERROR indicator will illuminate when a controller Watchdog fault is detected. If the WD

ENABLE switch is placed in the OFF position to disable Watchdog monitoring, or the AC Line voltage

is below the Watchdog disable level, the WDT ERROR indicator will flash ON once every 2 seconds.

5.1.4 CONFLICT INDICATOR

The CONFLICT indicator will illuminate when a conflicting proceed signal fault is detected.

5.1.5 PCA INDICATOR

The PCA indicator will illuminate if the Program Card is absent or not properly seated. A manual Reset

is required after the program card is properly seated. If the unit is in the Diagnostic Display mode, the

PCA indicator will flash ON (once, twice, or three times) to indicate the fault event number being

displayed. See Section 3.10.

5.1.6 DIAGNOSTIC INDICATOR

The DIAGNOSTIC indicator will illuminate when an internal hardware or firmware test function has

failed. This indicator is intended to inform the service technician of a monitor hardware or firmware

failure. Due to the nature of these hardware or firmware failures, other fault indicators that may be

concurrently illuminated may not be valid for trouble shooting purposes.

5.1.7 CHANNEL STATUS INDICATORS

During normal operation the Signal Monitor Channel Status indicators will display all active proceed

signals (Green or Yellow).

In the fault mode the Channel Status indicators will display all proceed signals active at the time of a

24VDC fault (VDC FAILED) or Watchdog fault (WDT ERROR). In the event of a Conflict only the

channels on which the fault occurred will be displayed.

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 8

5.2 FRONT PANEL CONTROLS

5.2.1 RESET BUTTON

Depressing the Reset button resets the Signal Monitor after it has been triggered by a fault. The monitor

will remain in the reset mode only if the fault condition has been restored to normal. In the event of a

monitor hardware or firmware fault (DIAGNOSTIC) the Reset button may not reset the monitor. A

power-up restart may be required.

The Reset button also provides control of the Diagnostic Display mode. For a complete description of

Diagnostic Display operation see Sections 3.10.

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 9

Section 6

THEORY OF OPERATION

6.1 INTRODUCTION

The Signal Monitor uses a dual microprocessor architecture consisting of an 68HC11D0 main

microprocessor unit (MPU) and a PIC18F24K222 based RMS-Engine. The RMS-Engine is a dedicated

single-chip high speed microcontroller used to sample the AC field inputs and calculate the true Root

Mean Squared (RMS) voltage. This true RMS voltage information is then transmitted to the main

microprocessor for fault processing.

The 68HC11D0 main microprocessor uses ahigh speed synchronous serial I/O system called the Serial

Peripheral Interface (SPI) to exchange data with the peripheral circuit blocks. It controls all functions of

the unit except for those of the RMS-Engine.

6.2 MAIN MPU LOGIC

The 68HC11D0 main microprocessor (U13) operates in the Expanded Multiplexed mode which allows

for external memory devices. The program firmware is contained in the 39SF010A CMOS Flash device

(U11) and program data storage is contained in the SRM2264 8Kx8 static RAM (U16). The expanded

address and data buss is used to link the memory devices with the microprocessor. A 74HC137 (U14)

selector also resides on the buss to generate chip select signals for the SPI devices.

6.3 SERIAL PERIPHERAL INTERFACE (SPI)

The Serial Peripheral Interface (SPI) is a high speed synchronous serial I/O system used to

interconnect the main microprocessor to the following circuit blocks: EEprom (U21), 24Vdc Logic

Processor (U41), Display Multiplexer (U1), Program Card and Switch inputs (U25.3), and the RMS-

Engine (U37).

Data is clocked out of the main microprocessor on the MOSI pin (U13.18) while data is clocked in on

the MISO pin (U13.17). The SCLK signal (U13.20) provides the synchronous clock. A peripheral device

must be selected by U18 before SPI transfers may take place.

6.4 INTERNAL MPU WATCHDOG

Circuit U4A and U4B comprise the internal MPU Watchdog circuit. If this circuit does receive an input

from the main microprocessor for at least 625 ms, the circuit will trigger and force the Output relay to

the fault mode, enable the Stop-Time output, and illuminate the DIAGNOSTIC indicator. This indicates

that the microprocessor has failed to operate its program loop. Under normal conditions the

microprocessor will clock this circuit every 20 ms.

If jumper E5 is installed this fault mode will only be reset by a complete power down cycle.

6.5 EEPROM MEMORY

The 25C640 Serial EEprom (U21) device provides 8192 bytes of nonvolatile memory. It is interfaced to

the main microprocessor through the SPI port. No battery is required to maintain the data in this device.

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 10

6.6 24VDC LOGIC INPUTS

The Cabinet 24VDC input, CU Watchdog input, and External/Manual Reset inputs are processed by a

PIC16F687 microprocessor U41. Opto-couplers U28, U31, U36, and U38 provide electrical isolation

between Logic Ground and Neutral.

6.7 DISPLAY

The front panel LED display is multiplexed by the row driver U3 and the column driver U1. The scan

rate is approximately 60 Hz. Display data is shifted into U3 while individual columns are selected by U1

using the SPI interface.

6.8 PROGRAM CARD AND SWITCH INPUTS

The program card andconfiguration switch inputs are scanned through a diode matrixusing row drivers

U32 and U33. Column drivers U34 and U35 select the column to be read. These devices transfer data

to the main MPU through the SPI interface.

6.9 RMS-ENGINE

The RMS-Engine is a Microchip PIC18F24K22 (U37) single-chip high performance RISC

microcomputer executing proprietary firmware that calculates true RMS voltages for each input

channel. The resulting data is transferred to the main MPU via the SPI interface. The analog to digital

converter (U39) provides the voltage measurement data for the RMS-Engine approximately every 6

microseconds. Analog multiplexers (74HC4051N) select the appropriate channel for sampling. Op amp

circuits U40 provide a buffer circuit.

6.10 POWER SUPPLY

The switching power supply is based on a MIC38C43 (U20) fixed frequency current-mode PWM

controller. The AC Line is full wave rectified and charges capacitor C78 to approximately 170 Vdc. The

PWM controller switches current from C78 through the transformer T1 using transistor Q4 at

approximately 200 KHz. The transformer couples this energy to the secondaries and provides the

following output voltages: VDD=+5 Vdc, VCC=+8 Vdc, VGG=-8 Vdc, VEE=-5 Vdc, VCCL=+16 Vdc,

and VDDS=+5 Vdc. Opto-coupler U26 provides feedback to the controller for regulation.

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 11

Section 7

MAINTENANCE

7.1 TROUBLE SHOOTING

SYMPTOMS:

Will not power on

CAUSES:

A) Blown fuse

B) Internal power supply is low

C) No AC input to the monitor

SOLUTIONS:

A) Remove the fuse and verify with an Ohm meter. Replace if necessary with a fuse with the

same current rating.

B) Check the unregulated voltage across filter capacitor C78 with an oscilloscope or volt meter.

It should read approximately 170 Vdc when the AC Line is equal to or greater than 110

Vrms. If the regulated supply (VDD) is less than 4.5 Vdc the internal power supply

monitoring circuit (U17) will hold the MPU in reset and the DIAGNOSTIC indicator on the

front panel should illuminate. Measure the regulated voltage across capacitor C28. If it

measures lower than 5 _+0.5 Vdc the regulated supply may be overloaded or shorted to

ground.

C) If the fuse is not blown then the monitor may not be getting AC Line or Neutral to the edge

connector of the monitor.

SYMPTOMS:

Faults when AC power is applied

CAUSES:

A) Program card is absent or not seated properly

B) AC Line level is low

C) Memory device fault

D) No internal watchdog pulses

SOLUTIONS:

A) The PCA indicator on the front panel will illuminate. Re-insert the program card with the

diode side of the card facing the front panel slot and depress the RESET switch. The rear

edge of the program card should be flush with the front panel.

B) Measure the AC Line voltage level with a volt meter. If it is below the required "drop-out"

level, the monitor will transfer the Output relay contacts and enable the STOP TIME output

to the controller. The AC POWER indicator on the front panel will flash at a rate of 2 Hz to

indicate the "brown-out" condition.

C) The memory devices are verified when AC Line power is applied or a Reset command is

issued. If a memory fault is detected the MPU executes a STOP instruction. This causes all

MPU activity to cease. Refer to Section 3.8.

D) Absence of internal watchdog pulses may be due to the following conditions: the MPU is

not executing or completing the program loop or the hardware to detect the internal

watchdog pulses is not functioning. Place an oscilloscope probe on U4.2. If there are no

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 12

pulses, depress the front panel reset switch to re-start the MPU. If the watchdog pulses are

now present on U4.2 then trace the remaining pulse detection hardware for the required

waveforms.

SYMPTOMS:

Required channels will not conflict

CAUSES:

Diode on the Program Card is open or absent

SOLUTIONS:

Check the program card to verify that the required diode is in place. If the diode is present then

verify all connections are good and the diode is working correctly.

210 SERIES SIGNAL MONITOR

OPERATIONS MANUAL

Eberle Design Inc. Page 13

Section 8

SPECIFICATIONS

8.1 ELECTRICAL

8.1.1 POWER REQUIREMENTS

Operating Line Voltage .................................................................................................. 75 to 135 Vrms

Operating Line Frequency ........................................................................................................ 60 _+3Hz

Power Consumption.......................................................................................................... 5W (nominal)

8.1.2 AC VOLTAGE MONITORS

Green Signal Inputs (no detect)...................................................................... less than 15 Vrms

(detect)...................................................................... greater than 25 Vrms

Yellow signal Inputs (no detect)...................................................................... less than 15 Vrms

(detect)...................................................................... greater than 25 Vrms

Watchdog Enable (enable).............................................................. greater than 103 _+2 Vrms

(disable).................................................................... less than 98 _+2 Vrms

AC Line Brown-out (drop-out) .................................................................................. 82 _+2 Vrms

(restore) .................................................................................... 87 _+2 Vrms

8.1.3 DC VOLTAGE MONITORS

+24VDC Input (fault).............................................................................. less than +18 Vdc

(no fault).................................................................... greater than +22 Vdc

External Reset Input (true) ................................................................................ less than 3.5 Vdc

(False)......................................................................... greater than 8.5 Vdc

Watchdog Input (true) ................................................................................ less than 3.5 Vdc

(false).......................................................................... greater than 8.5 Vdc

8.2 TIMING FUNCTIONS

Conflict (no fault)............................................................ less than 200 milliseconds

(fault)............................................................ greater than 500 milliseconds

(typical) ............................................................................. 350 milliseconds

VDC Failed (no fault)............................................................ less than 200 milliseconds

(fault)............................................................ greater than 500 milliseconds

(typical) ............................................................................. 400 milliseconds

Watchdog (no fault).......................................................... less than 1400 milliseconds

(fault).......................................................... greater than 1600 milliseconds

(typical) ........................................................................... 1500 milliseconds

AC Line Brown-out (drop-out) .................................................................... 80 _+17 milliseconds

(restore) ...................................................................... 80 _+17 milliseconds

Watchdog Disable (disable)...................................................................... 80 _+17 milliseconds

(enable)....................................................................... 80 _+17 milliseconds

8.3 MECHANICAL

Height .................................................................................................................................... 9.3 inches

Width.................................................................................................................................... 1.38 inches

Depth ................................................................................................................................. 10.17 inches