Midmark 646 Podiatry Procedures Chair Wiring diagram

FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY

Model Numbers:

Service and

Parts Manual

TP204 20-42-FO-00015 Rev A1 C2169

004-10113-00 Rev. AA4 (2/14/19)

Podiatry

Procedures Chair

646

Serial Numbers:

V1977128 thru Present

Style B

ii© Midmark Corporation 2018 004-10113-00 (mo/dd/yr) TP204 20-42-FO-00015 Rev A1 C2169

ACCESS PROCEDURES

PC Board Cover .......................C-2

Upholstery ................................C-3

Foot Extension Covers..............C-4

Foot Slide Remove / Install ....... C-6

WIRING DIAGRAMS

646 (-001) .................................D-1

EXPLODED VIEWS

646 (-001) .................................E-1

Table of ContentsTable of Contents

General InfoSection A

Section E

GENERAL INFORMATION

Symbols ....................................... iii

Ordering Parts ............................. iii

Serial Number Location ............... iii

Specications ..............................iv

Model Identication /

Compliance Chart ...................... iv

Scheduled Maintenance /

Cleaning Chart ............................ v

TROUBLESHOOTING

Troubleshooting Chart ..............A-2

Diagnostic LED’s ......................A-5

Error Code Chart ......................A-8

Power to the Chair .................. A-10

Back Up / Down ...................... A-11

Tilt Up / Down .........................A-13

Crash Avoidance System .......A-15

QuickChair Function ...............A-16

Chair Receptacles ..................A-18

Foot Extension ........................A-19

TESTING & ADJUSTMENTS

Foot Control / Touch Pads ........ B-2

Actuators / Limit Switches:

Back ........................................B-5

Tilt ......................................... B-10

Foot Extension /

Limit Switch ..........................B-16

(*) Indicates multiple pages due to model / serial number break(s).

Section B

Section D Section C

iii© Midmark Corporation 2018 004-10113-00 (mo/dd/yr) TP204 20-42-FO-00015 Rev A1 C2169

General InformationGeneral Information

Symbols

DANGER

Indicates an imminently hazardous situation which

will result in serious or fatal injury if not avoided.

This symbol is used only the most extreme conditions.

WARNING

Indicates a potentially hazardous situation which

could result in serious injury if not avoided.

Caution

Indicates a potentially hazardous situation which may

result in minor or moderate injury if not avoided. It may

also be used to alert against unsafe practices

Equipment Alert

Indicates a potentially hazardous situation which could

result in equipment damage if not avoided.

Ordering Parts

The following information is required when ordering parts:

 • Serialnumber&modelnumber

 • Partnumberfordesiredpart

(Refer to Section E: Exploded Views & Parts Lists)

For warranty parts orders, call Midmark’s Technical Service

Department with the required information.

Hours:8:00amto5:00p.m.EST(MondaythruFriday)

Phone:1-800-Midmark(1-800-643-6275)

Serial Number Location

Serial Number

Label

MA10935i

iv© Midmark Corporation 2018 004-10113-00 (mo/dd/yr) TP204 20-42-FO-00015 Rev A1 C2169

Specications

Patient Weight (max): 450lbs(204kg)

Weight of Chair: 290lbs(131kg)

Power Cord Length: 8 ft (244 cm)

Foot Control Voltage: 10VAC,SELV(SafetyExtraLowVoltage)

Chair Receptacle

Maximum Load:

115VAC,3amps,50/60Hz

Duty Cycle

(Motor Run Time):

IntermittentOperation

(30secondsON-5minutesOFF)

Protection against

ingress of uids:

OrdinaryEquipment

Foot control only:IPX1

Classications: Class1,TypeB,AppliedPart

Electrical Requirements: See model identication chart below

Regulatory Compliance: See model identication chart below

Equipment not suitable for use in the presence of a ammable anesthetic mixture with air, oxygen, or nitrous oxide.

Model Identication / Compliance Chart

Model Description

Complies To: Electrical Ratings:

UL

60601-1

EN

60601-1-2

(EMC)

VAC

+/- 10%

Amps

Cycles

(Hz)

646-001 Two-FunctionChair

(Back & Tilt)

Non-Programmable

w/Receptacles

• •

115 6.0 60

Back Function

Full Down: 0° +1/2°

Full Up: 80° +3°

Tilt Function

Full Down: 0° +1/2°

Full Up: 30° +2°

MA10936i

Seat Height

21 in. (53 cm)

v© Midmark Corporation 2018 004-10113-00 (mo/dd/yr) TP204 20-42-FO-00015 Rev A1 C2169

Scheduled Maintenance / Cleaning Chart

Interval Inspection / Service Description

Weekly

Cleaning

Cleanupholsterywithappropriatedilutedbleachsolution10:1(water:bleach)

Wipepaintedmetal&plasticsurfaceswithacleansoftclothandmildcleaner.

ObviousDamage Visuallyinspectcomponentsfordamagethatcouldresultinunsafeoperation.

Semi-Annually

MechanicalOperation Checkallmechanicalfunctionsusingthefootcontrol.Repeatusingthetablemountedtouchpads.

Labels/Decals Replaceanymissingorillegiblelabels.

Hardware Allfastenersmustbepresentandfastenedsecurely.

ElectricalSystem

Inspectpowercordandallwiringfordamage.

Besureallelectricalconnectionsaretight.

Date of Service:

Location:

ServiceTechnician:

ModelNumber:

SerialNumber:

Notes:

A-1© Midmark Corporation 2018 004-10113-00 (mo/dd/yr) TP204 20-42-FO-00015 Rev A1 C2169

Section ASection A

Troubleshooting

Troubleshooting Chart .......................A-2

Power to the Chair ............................. A-5

Back Up / Down ................................. A-6

Tilt Up / Down ....................................A-8

Crash Avoidance System ................A-10

QuickChair Function ........................ A-11

Chair Receptacles ...........................A-13

Foot Extension.................................A-14

A-2© Midmark Corporation 2018 004-10113-00 (mo/dd/yr) TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Troubleshooting Chart

Problem Symptom Probable Cause Check Correction

No functions will operate.

PowerlightisOFF. Facilitysupplyvoltage. Powercordconnections&facility

circuitbreaker.

Securepowercordconnections.

Resetcircuitbreakerifnecessary.

PowerlightisON. Primaryfuse(s)blown. Inspectfuses. Replacefaultyfuse(s).

Power/QuickChairPCboard. Wireconnectionsbetween

powercordandPower/Quick

ChairPCboard.

Secure loose connections.

IfconnectionsareOK,replace

Power/QuickChairPCboard.

Footcontrol/touchpad. Tryactivatingfunctionsfromeach

touchpad/footcontrol.

Refer to: Foot Control / Touch Pads

No power at chair

receptacles.

Thereispowertothechair,butnopower

atthechairreceptacles.

Powercordconnection. Checkbothpowercordconnections. Secure both powercordconnections.

Receptaclecircuitbreaker(s). Checkifreceptaclecircuitbreaker(s)

tripped.

Resetreceptaclecircuitbreaker(s)

atrearofchairbase.

Loose/damagedwireconnections. Wireconnectionsbetween

receptaclepowercord&table

receptacles.

Secure/repairwireconnections.

Foot extension

malfunctioning.

Footextensionwillnotlockinplace.

- or -

Footextensionwillnotrelease.

Footextensionlockingmechanism

malfunctioning.

Footextensionlockingmechanism.

Refer to:

Locking Mechanism Inspection

Replacefaultycomponent(s).

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A-3© Midmark Corporation 2018

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

Problem Symptom Probable Cause Check Correction

Back function not operating

properly.

NoBackUporBackDown. Footcontrol/touchpad. Tryactivatingfunctionsfromeach

touchpad/footcontrol.

Refer to: Foot Control / Touch Pads

Loose/damagedwireconnections. CheckwireconnectionstoBack

actuator&Backlimitswitches.

Secureanylooseconnections.

Backactuator/MotorControlPCboard.

Refer to:

Back Actuator / Limit Switches

Followtestsequenceoutlinedin

Section B.

NoBackUp.

BackDown-OK.

-OR-

NoBackDown.

BackUp-OK.

Footcontrol/touchpad. Tryactivatingfunctionsfromeach

touchpad/footcontrol.

Refer to: Foot Control / Touch Pads

(No Back UP)

BackUplimitswitch.

(No Back Down)

BackDownlimitswitch.

Wire connections to limit switch. Replacelimitswitch/bracketassembly.

Refer to: Back Actuator / Limit Switches

Backactuator/MotorControlPCboard.

Refer to:

Back Actuator / Limit Switches

Followtestsequenceoutlinedin

Section B.

Backdriftsdown. Backactuator/motorcoupler.

Refer to:

Back Actuator / Limit Switches

Replacemotorcoupler.

Noisyoperation(grinding,squeaking,

etc.)

Backactuator.

Refer to:

Back Actuator / Limit Switches

Followinstructionsoutlinedin

Section B.

Backfunctionmovesslowly,

and/orwillnotliftpatient.

Patientexceeded450lbweightlimit. CheckifPatientexceeded450lb

weightlimit.

Informstathatmaxpatientweightis

450lbs.

Lowvoltagetotable.

Checksupplyvoltage.

Required:115VAC+10%

Connectadequatesupplyvoltage.

Backactuatormotor.

PerformActuator Motor Test

Referto:SectionB-BackActuator/

Limit Switches.

Followtestsequenceoutlinedin

Section B.

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A-4© Midmark Corporation 2018

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

Problem Symptom Probable Cause Check Correction

Tilt function not operating

properly.

NoTiltUporTiltDown. Footcontrol/touchpad. Tryactivatingfunctionsfromeachtouch

pad/footcontrol.

Refer to: Foot Control / Touch Pads

Loose/damagedwireconnections. Checkwireconnectionsto:tiltactuator,

tiltdownlimitswitch.

Secureanylooseconnections.

Tiltactuator/MotorControlPCboard.

Refer to: Tilt Actuator / Limit Switch

/ Sensor PC board

Followtestsequenceoutlinedin

Section B.

NoTiltUp.

TiltDown-OK.

-OR-

NoTiltDown.

TiltUp-OK.

Footcontrol/touchpad. Tryactivatingfunctionsfromeachtouch

pad/footcontrol.

Refer to: Foot Control / Touch Pads

(No Tilt Down)

CrashAvoidanceSystem.

Refer to: Tilt Actuator / Limit Switch

/ Sensor PC board

Followtestsequenceoutlinedin

Section B.

(No Tilt Down)

TiltDownlimitswitch.

Checkwireconnectionstolimitswitch. If connections are OK,

performLimit Switch Test

Refer to: Section B -

TiltActuator/LimitSwitch.

Tiltactuator/MotorControlPCboard.

Refer to: Tilt Actuator / Limit Switch

/ Sensor PC board

Followtestsequenceoutlinedin

Section B.

TiltUp/Down-OK,

but“beeps”infullUPposition

TiltUpSensorPCboard.

Perform Sensor PC Board Check

Refer to: Section B -

TiltActuator/LimitSwitch.

ReplaceSensorPCBoard

ifnecessary.

Seatdriftsdown. Tiltactuator/motorcoupler.

Refer to: Tilt Actuator / Limit Switch

/ Sensor PC board

Replacemotorcoupler.

Noisyoperation.

(grinding,squeaking,etc.)

Tiltactuator.

Refer to: Tilt Actuator / Limit Switch

/ Sensor PC board

Followinstructionsoutlinedin

Section B.

Tiltfunctionmovesslowly,

and/orwillnotliftpatient.

Patientexceeded450lbweightlimit. CheckifPatientexceeded450lbweight

limit.

Informstathatmaxpatientweightis

450lbs.

Lowvoltagetotable.

Checksupplyvoltage.

Required:115VAC+10%

Connectadequatesupplyvoltage.

Tiltactuatormotor.

PerformActuator Motor Test

Refer to: Section B -

TiltActuator/LimitSwitch.

Followtestsequenceoutlinedin

Section B.

646

all

A-5© Midmark Corporation 2018

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

Diagnostic LED’s (Run Mode)

Isolating a Malfunction

The646hassixLEDsandadiagnosticswitch(S1)locatedontheMotorControlPCboardfordiagnosticpurposes.TherearethreemodesthatusetheseLEDs;

RunMode,SwitchCheckMode,andErrorDisplayMode.YoucanswitchbetweenthesemodesbypressingandholdingtheS1switchforthreeseconds.

TheRunModeisthedefaultcongurationofthesystem.ItiswheretheothermodesreverttoiftheS1switchisnotpressedforfteenminutes.

Activity Denition

Green(OK)LEDFlashing Systemoperatingnormally

Red(RD)LEDFlashing Systemhasanerror

Motor Control

PC Board

646

all

A-6© Midmark Corporation 2018

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

646

all

Diagnostic LED’s (Switch Check Mode)

Isolating a Malfunction

TheSwitchCheckModeallowsforcheckingtheswitcheswithouttheuseofspecialequipment.ToentertheSwitchCheckMode,

pressandholdthediagnosticswitch(S1)forthreeseconds.TheMotorControlPCBoardwillgivetwoshortbeepsandthemajorityofthediagnostic

LEDs will turn on.

IntheSwitchCheckMode,activatingalimitswitchturnsoaLED,seetablebelow.PressingacontrolswitchontheFootcontrolwillelicitasinglebeepfrom

theMotorControlPCBoard.ThismodewilltimeoutandreverttotheRunModeafterfteenminutes.

Motor Control

PC Board

Activity Denition

Green(OK)LEDFlashing Systemrunning.

Green(GR)LEDO BackUplimitswitch“Open”

White(WT)LEDO BackDownlimitswitch“Open”

Orange(OR)LED (NotUsed)

Blue(BL)LEDO TiltUpSensor“Open”

Red(RD)LEDO TiltDownlimitswitch“Open”

A-7© Midmark Corporation 2018

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

Diagnostic LED’s (Error Display Mode)

Isolating a Malfunction

TheErrorDisplaymodeallowsforviewingofbothcurrentandpasterrorsdetectedbytheMotorControlPCBoard.Errorsaredetectablebythe

MotorControlPCBoardandtheseareindicatedbytheuseofLEDswithalastLED(Red)toindicateiftheerrorbeingdisplayediscurrent.

Toshowtheerrors:FromtheRunMode,pressthediagnosticswitch(S1)onceforthreesecondsandthenpressitagainforthreeseconds.Themostrecenterror

willbedisplayedbytheLEDs.Ifnoerrorshavebeendetected,noLEDswillturnon.PressingtheS1switchagainwilldisplaythenextmostrecenterror.

RepeatingswitchpresseswillcontinuedisplayingsubsequenterrorsuntiltheerrorlistiscompleteandtheLEDswillallbeo.PressingtheS1switchagainwill

repeatthisprocess.

TheLEDpatternforeacherrorisinthetablebelow.TheLEDswillturnoifaswitchisnotpressedforfteenminutes.

PressingandholdingtheS1switchforten secondswillclearallerrors.Note:TwoBeepswilloccur,oneafterthreesecondsandoneaftertenseconds.

Motor Control

PC Board

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Activity Code Denition

Green(OK)LEDFlashing

N/A

Systemrunning.

Green(OK)LEDO

N/A

ErrorCondition

Red(RD)LEDOn

N/A

Current Error

Green (GR) LED On

01

MicroOverTemperature

White(WT)LED 02

(NotUsed)

Green(GR),White(WT)LED’sOn

03

BackUpandDownlimitswitches“Open”

Orange(OR)LEDOn

04

TiltUpsensorand

Downlimitswitch”Open”

Green(GR),Orange(OR)LED’sOn

05

BackOverCurrent

White(WT),Orange(OR)LED’sOn

06

TiltOverCurrent

Green(GR),White(WT),Orange(OR)LED’sOn

07

BackOverVoltage

Blue (BL) LED On

08

TiltOverVoltage

Green(GR),Blue(BL)LED’sOn

09

NVMError

White(WT),Blue(BL)LED’sOn

10

MotorBusVoltageLow

Green(GR),White(WT),Blue(BL)LED’sOn 11 MotorBusVoltageHigh

Orange(OR),Blue(BL)LED’sOn 12 MicroLowVoltage

Green(GR),Orange(OR),Blue(BL)LED’sOn 13 Switch(es)pressedatstartup

White(WT),Orange(OR),Blue(BL)LED’sOn 14 MotorBusFuse(F1)Blown.

A-8© Midmark Corporation 2018

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

Error Code Chart

Error Code Error Denition Cause Check Action

01

MicroOverTemperature

MotorControlPCboard. CheckifMotorControlPCboardisoverheating. DisconnectpowertoallowMotorControlPCboard

to cool. See if error clears.

CheckMotorControlPCboardcomponentsfor

overheatingandreplacePCboard.

02

(NotUsed)

n/a n/a n/a

03

BackUpandDownlimit

switch(es) “Open”

Backuplimitswitch. CheckBackuplimitswitch.

Refer to: Back Actuator / Limit Switches

Replacelimitswitch/bracketassembly.

LooseorfaultyBackuplimitswitchwire

connections.

Checkwiresconnectionstolimitswitch.

Refer to: Back Actuator / Limit Switches

Secureorreplaceloosewireconnections.

Backdownlimitswitch.

CheckBackdownlimitswitch.

Refer to: Back Actuator / Limit Switches

Replacelimitswitch/bracketassembly.

LooseorfaultyBackdownlimitswitch

wire connections.

Checkwiresconnectionstolimitswitch.

Refer to: Back Actuator / Limit Switches

Secureorreplaceloosewireconnections.

04

TiltUpsensorandDownlimit

switch “Open”

TiltUpSensorPCboard. Refer to: Tilt Actuator / Limit Switch

/ Sensor PC board

Followtestsequenceoutlinedin

Section B.

TiltDownlimitswitch. Checkwireconnectionstolimitswitch.

If connections are OK,

performLimit Switch Test

Refer to: Section B -

TiltActuator/LimitSwitch.

05

BackOverCurrent

Patientweightexceeded450lbs. Checkifpatientweightexceededthe

450lb.weightlimit.

Informstathatmaximumpatientweightis450lbs.

Mechanicalbinding. Checkactuatormountsandhingeareafordamage. ReportanydamagetoMidmarkTechnicalService.

06

TiltOverCurrent

Patientweightexceeded450lbs. Checkifpatientweightexceededthe

450lb.weightlimit.

Informstathatmaximumpatientweightis450lbs.

Mechanicalbinding. Checkactuatormountsandhingeareafordamage. ReportanydamagetoMidmarkTechnicalService.

07

BackOverVoltage

Hardwaresensedtoomuchvoltage

acrossBackactuatormotor.

Backactuatormotor. ReplaceBackactuatormotor.

Iftheissuepersist,replaceMotorControl

PCboard.

MotorControlPCboard.

08

TiltOverVoltage

Hardwaresensedtoomuchvoltage

acrossTiltactuatormotor.

Tiltactuatormotor. ReplaceTiltactuatormotor.

Iftheissuepersist,replaceMotorControl

PCboard.

MotorControlPCboard.

09

NVMError

Savingtoorerasingfrommemoryfailed. MotorControlPCboard. Disconnectpowercordforatleastveseconds,

thenplugbackin.Seeiferrorclears.

ReplaceMotorControlPCboard.

646

all

A-9© Midmark Corporation 2018

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

646

all

Error Code Chart

Error Code Error Denition Cause Check Action

10

MotorBusVoltageLow

Lowsupplyvoltage. Checkfacilitysupplyvoltage. Contactelectriciantomodifyvoltage.

(ifnecessary)

11

MotorBusVoltageHigh

Highsupplyvoltage. Checkfacilitysupplyvoltage. Contactelectriciantomodifyvoltage.

(ifnecessary)

12

MicroLowVoltage

Loose wire connection.

MotorControlPCboardmalfunction.

MotorControlPCboard. Disconnectpowercordforatleastveseconds,

thenplugbackin.Seeiferrorclears.

Ensureappropriatevoltagesarebeingsuppliedto

MotorControlPCboard.

ReplaceMotorControlPCboard.

13

Switch(es)activatedatpower

up.

Footcontrol/touchpadactivatedat

powerup.

CheckifoperatordepressedFootcontrol/touch

padbuttonatpowerup.

Informstaofproperoperation.

DamageFootcontrol/touchpad

harness.

CheckFootcontrol/touchpadharness’s

Refer to: Foot Control / Touch Pads

Replacedefectiveharnness.

FaultyFootcontrol/touchpad. Tryactivatingfunctionsfromeachtouchpad/foot

control.

Refer to: Foot Control / Touch Pads

14

MotorBussFuse(F1)Blown

MotorControlPCboardfuseblown. TestF1fuseonMotorControlPCboard. Replaceblownfuse.

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

Power to the Chair

Thisillustrationshowsonlythecomponents/wiringthataectALLCHAIRFUNCTIONS.

No functions will operate ...................A-2

Facility Supply Voltage / Power / QuickChair PC board / Motor Control PC Board

Withthechair’spowercordproperlyconnected,facilitysupplyvoltage(115 VAC)issuppliedthrutwoprimaryfuses(F1 & F2)onthePower/QuickChairPCboard.

CurrentthenowsthruanEMIFiltertotheMotorControlPCboard.FuseF1ontheMotorControlPCboardprotectstheBackandTiltactuatormotors.

FuseF2ontheMotorControlPCboardprotectsthetransformerontheMotorControlPCboardandtheelectronicssuppliedbythetransformer.

TheMotorControlPCboardalsosupplies3.3VDCtothefootcontrolandthetwotouchpadsviaJ4andJ5onPower/QuickChairPCboard.

Note

The 646 has two power cords. One cord supplies voltage

to the Power / QuickChair PC board. The other cord

(not shown) supplies voltage to the chair receptacles.

Power Indicator Light

Whenvoltageisapplied

tothePower/QuickChair

PCboard,thepowerlight

isilluminated.

646

all

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

Back UP / DOWN Function

Thisillustrationshowsonlythecomponents/wiringthataecttheBackUP/DOWNfunction.

RefertothefollowingpageforadetaileddescriptionofBackUP/DOWNoperation.

No Back Up or Back Down ................A-3

No Back Up. Back Down - OK ........... A-3

No Back Down. Back Up - OK ........... A-3

Back drifts down ................................A-3

Noisy operation

(grinding, squeaking, etc) ................A-3

Function moves slowly, and/or

will not lift patient .............................A-3

646

all

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

Back Up Operation

WhentheBackUpfunctionisactivated,current

owsthruthefootcontrol/touchpadbackto

theMotorControlPCboard.Circuitryonthe

MotorControlPCboardsuppliesapproximately

48VDCtothebackactuatormotor.

Theactuatormotorrunsandraisestheback

section.

Actuator motor runs until:

1. Footcontrol/touchpadbuttonisreleased.

2. BackUplimitswitchistripped.

3. EmergencyStopbuttonispressed.

4. Overcurrentprotectiontripped.

5. Softwaretimeoutisreached(30seconds).

Back Down Operation

WhentheBackDownfunctionisactivated,

currentowsthruthefootcontrol/touchpad

backtotheMotorControlPCboard.Circuitry

ontheMotorControlPCboardsupplies

approximately48VDCtothebackactuator

motor.

Theactuatormotorrunsandlowerstheback

section.

Actuator motor runs until:

1. Footcontrol/touchpadbuttonisreleased.

2. BackDownlimitswitchistripped.

3. EmergencyStopbuttonispressed.

4. Overcurrentprotectiontripped.

5. Softwaretimeoutisreached(30seconds).

Back UP / DOWN Function

Is there power to the table?

WhenvoltageispresentatthePower/Quick

ChairPCboardthepowerlightisilluminated.

[Refer to ‘Power to the Table’’ for description

of current ow to the PC board].

Power to Foot Control / Touch Pads

CircuitryontheMotorControlPCboardsupplies

3.3VDCtothefootcontrol&touchpads.

* Refer to Section A: Crash Avoidance System

for a detailed description of “crash position”,

and the functions that are disabled.

Note

The Motor Control PC board continuously

monitors the back down limit switch.

If the back down limit switch is tripped (open),

the Back Down function will not operate.

Note

The Motor Control PC board continuously monitors

the back up limit switch.

If the back up limit switch is tripped (closed), the

Back Up function will not operate.

646

all

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

Tilt UP / DOWN Function

Thisillustrationshowsonlythecomponents/wiringthataecttheTiltUP/DOWNfunction.

RefertothefollowingpageforadetaileddescriptionofTiltUP/DOWNoperation.

No Tilt Up or Tilt Down ......................A-4

No Tilt Up. Tilt Down - OK .................A-4

No Tilt Down. Tilt Up - OK .................A-4

Seat drifts down ................................. A-4

Noisy operation

(grinding, squeaking, etc) ................A-4

Function moves slowly, and/or

will not lift patient .............................A-4

646

all

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

Tilt Down Operation

WhentheTiltDownfunctionisactivated,current

owsthruthefootcontrol/touchpadbackto

theMotorControlPCboard.Circuitryonthe

MotorControlPCboardsuppliesapproximately

48 VDC to the tilt actuator motor.

Theactuatormotorrunsandlowerstheseat

sectiontoaatposition.

Actuator motor runs until:

1. Footcontrol/touchpadbuttonisreleased.

2. TiltDownlimitswitchistripped.

3. Footextensionswitchistripped.

4. EmergencyStopbuttonispressed.

5. Overcurrentprotectiontripped.

6. Softwaretimeoutisreached(30seconds).

Tilt Up Operation

WhentheTiltUpfunctionisactivated,current

owsthruthefootcontrol/touchpadbackto

theMotorControlPCboard.Circuitryonthe

MotorControlPCboardsuppliesapproximately

48 VDC to the tilt actuator motor.

Theactuatormotorrunsandreclinestheseat

section.

Actuator motor runs until:

1. Footcontrol/touchpadbuttonisreleased.

2. TiltSensorPCboarddetectsupperlimit.

3. EmergencyStopbuttonispressed.

4. Overcurrentprotectiontripped.

5. Softwaretimeoutisreached(30seconds).

Note

The Motor Control PC board continuously monitors

the Tilt Sensor PC board.

When the Tilt Sensor PC board detects that the

seat section has reached its upper limit, the

current flow to the tilt actuator is interrupted, and

movement stops. (The Tilt Sensor PC board

performs like a normally closed limit switch).

Note

The Motor Control PC board continuously

monitors the tilt down limit switch and the foot

extension switch.

If either the tilt down limit switch, or the foot

extension switch is tripped (open), current flow

to the tilt actuator is interrupted, and movement

stops.

* Refer to Section A: Crash Avoidance System

for a detailed description of “crash position”,

and the functions that are disabled.

Tilt UP / DOWN Function

Is there power to the table?

WhenvoltageispresentatthePower/Quick

ChairPCboardthepowerlightisilluminated.

[Refer to ‘Power to the Table’’ for description

of current ow to the PC board].

Power to Foot Control / Touch Pads

CircuitryontheMotorControlPCboardsupplies

3.3VDCtothefootcontrol&touchpads.

646

all

TP204 20-42-FO-00015 Rev A1 C2169

Models:

Serial Numbers:

Always verify model & serial number 004-10113-00 (mo/dd/yr)

Crash Avoidance System

TheCrashAvoidanceSystempreventsdamagetothetablebydisablingtheTiltDownfunctionifa

potentialcrashsituationisdetected.

ThisillustrationshowsonlythecomponentsthataremonitoredbytheCrashAvoidanceSystem.

No Tilt Down function - Tilt Up OK

(chair “beeps”) .................................A-4

When is Tilt Down function disabled?

TheMotorControlPCboardcontinuouslymonitorsthe

TiltDownandFootExtension*limitswitches.

Ifeithernormallyclosedswitchistripped,theTiltDown

functionisdisabled.

[* The foot extension switch is tripped when upward

pressure is applied to the foot section].

[The Tilt Sensor PC Board is shown

for reference only. It does not aect

the Crash Avoidance System]

[Only the wires that aect this function are shown]

646

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Midmark 646 Podiatry Procedures Chair Wiring diagram

Midmark 646 Podiatry Procedures Chair Wiring diagram

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