Midmark 646 Podiatry Procedures Chair Wiring diagram

646 Podiatry Procedures Chair
Midmark
Brand
Midmark
Model
646 Podiatry Procedures Chair
Category
Office & computer chairs
Type
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.
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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
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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
646
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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.
A-10© 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)
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
A-11© 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)
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
A-12© 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)
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
A-13© 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)
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
A-14© 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)
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
A-15© 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)
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

646 Podiatry Procedures Chair
Midmark
Brand
Midmark
Model
646 Podiatry Procedures Chair
Category
Office & computer chairs
Type
Wiring diagram
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