Quinton Q55 User manual

551 65
ieal
min
Service Manual
Qui
,
..

Other quality products a.vailable from Quinton:
TREADMILLS
ARTIFICIAL KIDNEY A-V CANNULAE
DIAG NOSTle ELECTRONIC INSTRUMENTS
GASTROINTESTINAL I NSTRUMENT.S
HOME EXERCISE NT AND ACCESSORIES
@ 1983 by Quinton Co.
All rights reserved.
Publication No. 0208-830

Quinton
PUBLICATION CHANGE NOTICE
instrument co.
PUBLICATION(SJ AFFECTED:
Q55/Q65 Medical Treadmill Service Manual
Publication Number 0208-830
Serial Numbers Affected: All
DATE:
May 2, 1984
1. Section 2.4, page 2-1. Insert the following warning preceeding the step 2
paragraph:
Qr02 -0029 lOB)
I WARNING I
EXCESSIVE RISK CURRENT (LEAKAGE) MAY RESULT IF
THIS EQUIPMENT IS CONNECTED TO OTHER THAN SINGLE
PHASE GROUNDED CENTER TAP SUPPLY.

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TABLE OF CONTENTS
SECTION 1. INTRODUCTION
1.1
1.2
1.3
1.3.1
1.3.2
1.3.3
1.4
1.5
1.6
1.6.1
1.6.2
1.7
1.7.1
1.7.2
1.8
1.9
SCOPE ....................................................................................................................... 1-1
ORGANIZATION ..•..•.•...•.•.••.••••..••••••••..•.......•....••.....•..•.• 1-1
Q55/Q65 PRODUCT DESCRIPTION •••••••••••••••••••••••••••••••••••••••••••• 1-1
Q2000 Stress Test Monitor ....................................................................................................... 1-1
Mode1645 Programmable Treadmill Controller ••••••••••••••••••••••••••••••••••• 1-2
Treadmill Controller .................................................................................................................. 1-2
TREADMILL CONTROLLERS ............................................................................ 1-2
ACCESSORIES ........................................................................................................................... 1-2
OPTIONS .....••...•••••....•.••••••••••••••••••....•.....•.............
Power Options
............................................................
.1-2
.1-2
Hardware Options (Q55/Q65) .....•....•..••..••..•............................ 1-3
SPECIFICATIO NS ...•..•.••.••••.••••••.•.••••••.••....
Q 55 SpecificatioIlS .••.....•..•.••.••.•.••.••....•.......
.1-3
.1-3
Q65 Specifications ...........•.•..••••.••.••..•...•..•....•.....••........... 1-3
OPERATOR MANUAL ••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1-4
REFERENCES ...•••••••••••••.••••••••••••••.•••.•.••.••••..•..•.......•... 1-4
SECTION 2. OPERA TIO N
2.1
2.2
2.3
2.4
INTRODUCTIO N
RECEIVING
•••••
...........................................................
...
........................................................
.2-1
•2-1
UNPACKING AND INSPECTION •••••••••••••••••••••••••••••••••••••••••••••• 2-1
INSTALLATION CHECKOUT PROCEDURE ••••••••••••••••••••••••••••••••••••• 2-1
SECTION 3. THEORY OF OPERATION
3.1
3.2
3.3
3.4
3.5
3.5.1
3.5.2
3.5.3
3.5.4
3.6
3.7
3.8
3.9
3.10
3.11
INTRODUCTION ..•••.••...•....•.••.••••.••••.•....•.....•..•.••••••.•••••• 3-}
PRINTED CIRCUIT BOARD (PCB) ••••••••••••••••••••••••••••••••••••••••••••• 3-1
POWER SUPPLY .•••.•.....••.•••••••••••••.....••.•.......••.••.••.•....•••• 3-}
DRIVE MOTOR ..•..•..••.•..•••••••.•...•••..•.•.•..•.....•..•.••••••••••••. 3-3
INPUT SHAFT, OUTPUT SHAFT, BELTS AND PULLEYS ••••••••••••••••••••• 3-3
Input Shaft. . . . . . . . . . . . •. . . . . • . . . . . . . . . . . . . . . . . . . . . . . . .....•...•..•••.••.. 3-4
Output Shaft .........•.•..•........•..............................•...•..... 3-4
Variable Speed Belt .......•.....•.•........................•..••.••..••...... 3-4
Treadmill Drive and Idler Pulleys ••••••••••••••••••••••••••••
WALKING BELT AND BELT TRACKING SWITCHES ••••••••••
. ............. . 3-4
. .............• 3-4
SPEED CHANGE MOTOR ASSEMBLY •••••••••••••••••••••••••••••••••••••••••• 3-5
TACHOMETER ASSEMBLY ......................
GRADE MOTOR ...•••••••.••••••••••••••...••••
PINION SHAFT AND RACK GEARS •••••••••••••
GRADE POTE NTIOMETER ••••••••••••••••••••••
....................... . 3-5
· .....
. ................. . 3-5
· ....................... . 3-5
· ....................... • 3-5
SECTION 4. TROUBLESHOOTING
4.1
4.2
4.3
INTRODUCTIO N •.••••••.•••••••••••••••••....•.••.••....•.....•••..•...•.•• 4-1
DIAG NOSTIC AIDS •••.••.•••••••••..•.••••••••••••.......•..•.•..•...•..•••. 4-1
TROUBLESHOOTING PROCEDURE •••••••••••••••••••••••••••••••••••••••••••• 4-1

SECTION 5. CORRECTIVE MAINTENANCE
5.1
5.2
5.2.1
5.2.1.1
5.2.1.2
5.2.1.3
5.2.1.4
5.2.1.5
5.2.1.6
5.2.1.7
5.2.1.8
5.2.1.9
5.2.2
5.2.2.1
5.2.2.2
5.2.2.3
5.2.2.4
5.2.2.5
5.2.3
5.2.3.1
5.2.3.2
5.2.3.3
5.2.3.4
5.2.3.5
5.2.4
5.2.4.1
5.2.4.2
5.2.4.3
5.2.5
5.2.6
5.2.6.1
5.2.6.2
5.2.6.3
5.3
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.4
5.4.1
5.4.2
5.4.3
5.4.4
5.5
INTRODUCTION •••••••••••••••••••••••••••••••••••••••••••••••••••• " •••••• 5-1
DISASSEMBLY AND REASSEMBLY PROCEDURES •••••••••••••••••••••• ' ••••••• 5-1
Access Under the Treadmill Hood ••••••••••••••••••••••••••••••••••••••••••••• 5-1
Drive Motor 2M2 Replacement •••••••••••••••••••••••••••••••••••••• , •••••• a_* .5-1
Speed Change Motor 2A2 Replacement •••••••••••••••••••••••••••••••••••••••• 5-1
Speed Change Motor Capacitor 2A2Cl Replacement ••••••••••••••••••••••••••••• 5-2
Tachometer 2A3 Optical Sensor Replacement ••••••••••••••••••••••••••••••••••• 5-2
Tachometer Beam Chopper Replacement ••••••••••••••••••••••••••••••••••••••• 5-2
Grade Motor 2Ml and/or Grade Motor Gearbox Replacement ••••••••••••• ~ ••••••• 5-2
Grade Potentiometer 2RI Replacement •••••••••••••••••••••••••••••••••••••••• 5-3
Printed Circuit Board (PCB) 2Al Replacement ••••••••••••••••••••••••• , •••••••• 5-4
Drive Motor Contactor 2Kl Replacement •••••••••••••••••••••••••••••••••••••• 5-4
Disassembly to Remove the Input Shaft Assembly ••••••••••••••••••••••••••••••• 5-4
Input Shaft Assembly Replacement •••••••••••••••••••••••••••••••••••••••••••• 5-4
Replacement of a Seized Bearing on the Input Shaft ............................... 5-5
Reinstallation of a Loose Bearing on the Input Shaft ••••••••••••••••••••••••••••• 5-6
Speed Change Spindle Assembly Replacement. •••••••••••••••••••••••••••••••••• 5-6
V-Belt and/or Machined Pulley Replacement •••••••••••••••••••••••••••••••••••• 5-6
Disassembly to Remove the Output Shaft Assembly ••••••••••••••• ~. ir~ ~:.;~ tl' ••• "~ ••. 5~6,\
Output Shaft Assembly Replacement •••••••••••••••••••••••••••••• ' .'~,,: ~ :c ••• ;• ~ 5~7 ...
Replacement of a Seized Bearing on the Output Shaft ••••••••••••• .,. ••••••• · ••••• 5-7
Reinstallation of a Loose Beari ng on the Output Shaft •••••••••••••••• ~ •••••••••• 5-7
Variable Speed Belt Replacement ••••••••••••••••••••••••••••••••• ~ ,-.':' •••••••• 5-8
.. '. - '.
Tlming Belt Replacement •••••••••••••••••••••••••••••.••••••••• ~ .: ••••••••.•• 5-8
Disassembly to Remove the Rack Gears or Pinion Shaft •••••••••••••••••••••••••• 5-8
Rack Gear Reassembly •••••••••••••••••••••••••••••••••••••••••••••••••••••• 5-8
Replacement of a Jammed Rack Gear •••••••••••••••••••••••••.•••••••••••••••• 5-9
Pinion· Shaft Replacement •••••••••• e •• · ••••••••••••••••••• e •••••••••••••••••••• 5~9
Belt Tracking Switch Replacement •••••••••••••••••••••••••••••••••••••••••••• 5-10
Disassembly to Remove the Walking Belt or Drive or Idler Pulley •••••••••••••••••• 5-10
Walking Belt Replacement ••••••••••••••••••••••••••••••••••••••••• ~ • ~ ••••••• 5-10
Drive or Idler Pulley Replacement •••••••••••••••••••••••••••••••••••••••••••• 5-10
Removing a Burr from the Deck ••••••••••••••••••••••••••••••••• ,• -.'f
r"',
~,.'., • • • • t 5-10
ADJUSTMENT AND ALIGNMENT PROCEDURES ••••••••••••••••••• ':~ ••••••••• '5-11
Timing Belt Tension Adjustment •••••••••••••••••••••••••••••••••••••• ~ ••••••• 5-11
Walking Belt Tension or Track Adjustment ••••••••••••••••••••••••••••••••••••• 5-11
Adjusting the Setscrews on the Speed Change Yoke •••••••••••••••••••••••••••••• 5-11
Torque Limiter ,Adjustment ••••••••••••••••••••••••••••••••••••••••••••••••••• 5-12
Tachometer Beam Chopper Alignment ••••••••••••••••••••••••••••••••••••••••• 5-12
CALIBRATION PROCEDURES ••••••••••••••••••••••••••••••••• ' •••••••••••••• 5-13
Speed Calibration ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 5-13
Grade Calibration ........................................................... 5-14
Trip Level.(Low Volts) Calibration ••••••••••••••••••••••••••••••••••••.•••••••• 5"-15
Grade Potentiometer Calibration •••••••••••••••••••••••••••••••.•••••••••••••• 5-15
. POST-MAINTENANCE PROCEDURE ••••••••••••••••••••••••••••••••••••••••• 5-15
SECTIO N 6. DRA WI N GS ••••••••••••••••••••••••• , •••••••••••••••••••••••••••••••••••• 6-1

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LIST OF FIGURES
Figure 1-1
Figure 1-2
Figure 1-3
Figure 3-1
Figure 3-2
Figure 3-3
Figure 4-1
Figure 5-1
Figure 5-2
Table 3-1
System Q (Q2000 with Q55) ............................................... 1-1
Model 645 Programmable Treadmill Controller •••••.•••••••••••••.••••.•••• 1-1
Q65 with
Treadmill Controller, PIN 14544-002 .•••.••••••••••••.•.••••••••. 1-2
Q55/Q 65 Medical Treadmill Components ••••••••••••••••••••••••••••••••••. 3-2
Q55/Q65 Medical Treadmill Functional Block Diagram •••••..••.••••••••••••• 3-7
Input Shaft, Output Shaft, Belts and Pulleys ••••••••••••••.•••••••••...••••• 3-3
Waveform at 2AIP7, Pin 1 ............................................... 4-18
Loosening the Variable Speed Belt •••••••••.••••••••.••••••••••.•••••••••• 5-5
Speed Change Spindle Assembly· •••••••••.•••••••••••••••••••••••••••••.•• 5-11
Drive Motor Specifications ............................................... 3-3

Thank you for purchasing this product from Quinton Medical Co.
With
proper care and operation, it will provide outstanding
performance, both now and in the years to come.
To assure
safe operation and efficient use of your time, please read
the entire operator manual before operating the equipment.
If you have questions
or problems regarding either operation or
service, please contact your local representative or our Seattle
office.
If you discover damage to your equipment, refer to Section 2 for
instructions on damaged shipments and freight claims.

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SECTION 1. INTRODUCTION
1.1 SCOPE
This service manual includes information on
how
to install and maintain Quinton's Q55 and
Q65 Medical Treadmills. The manual does not
include
information regarding any of the three
treadmill controllers that can be used with the
treadmill: the Q2000 Stress Test Monitor (PIN
0207-001 through 0207-006), the Model 645
Programmable Treadmill Controller (PIN
0222-001 through 0222-003) or Quinton's
Treadmill
Controller (PIN 14544-001 or -002).
1.2 ORGANIZATION
The information in this service manual is
organized as follows:
Sect ion 1 contains a general description of the
Q55 and Q65 Medical Treadmills and lists
options, accessories, specifications and
references.
Section 2 contains information on rece lYIng,
uncrating, inspecting and installing the
Q55/Q65 Medical Treadmill. An installation
checkout procedure is included.
Section 3 contains the theory of operation for
the Q55/Q65. It contains a general description
of the treadmill to the functional block
diagram level.
Section 4 addresses troubleshooting the
Q55/Q65. It describes diagnostic aids built
into the treadmill unit and includes fault logic
diagrams to assist in troubleshooting. If a
failure
occurs on the printed circuit board
(PCB), component replacement should occur at
the factory. For this reason, detailed
troubleshooting procedures for the PCB are
not provided.
Section 6 contains corrective maintenance
procedures. The section includes alignment,
adjustment, disassembly, repair and
reassembly procedures.
Section 7 contains assembly drawings,
cross-indexed
to reference designations.
1.3 055/065 PRODUCT DESCRIPTION
The Q55 and Q65 Medical Treadmills are
designed to function as Unit 2 of Quinton's Q
Series of stress test products. One of the
following Quinton instruments functions as
Unit I, the treadmill controller.
1.3.1 02000 Stress Test Monitor
In Quinton's System Q, the treadmill is a
peripheral
to the Q2000 Stress Test Monitor.
Figure
1-1 shows the System Q (Q2000 with
Q55).
Figure 1-1 System 0 (02000 with 055)
In System Q, the Q55 or Q65 depends entirely
upon the Q2000 for operational control. The
operator can use the dedicated treadmill
controls on the Q2000 front panel to change
speed or grade. The operator can also use a
stored treadmill protocol, programmed by the
operator, to control speed, grade and duration
for each stage of the protocol.
Figure 1-2 Model 645 Programmable Tread-
mill Controller
1-1

1.3.2 Model 645 Programmable Treadmill
Controller
Quintons Model 645 Programmable Treadmill
Controller (PTC) can also be used to run the
Q55 or Q65. The 645 PTC is a
microprocessor-controlled system that can
automatically control the Q55 or Q65 during a
stress test. The 645 PTC can store up to 12
protocols, two of which are permanently
stored. The other 10 protocols can be
programmed by the operator. Controls on the
645 PTC also allow manual control of the
treadmill. The 645 PTC displays metabolic
information as well as speed and grade
indication. Figure 1-2 shows the Model 645
Programmable Treadmill Controller.
1.3.3 Treadmill Controller
A third control device that can be used with
the Q55/Q65 is Quinton's Treadmill
Controller. Figure 1-3 shows the Q65 with
the Treadmill Controller. In this
configuration, treadmill control is totally
manual.
Figure 1-3 065 with Treadmill Controller, PIN
14544-002
1.4 TREADMILL CONTROLLERS
Any of the following treadmill controllers can
be used to operate the Q55/Q65 treadmill.
Treadmill Controller
Q2000 Stress Test Monitor
230V, 60Hz
230V, 50Hz
100V, 60Hz
100V, 50Hz
208V, 60Hz
115 V, 60Hz
1-2
Part Number
0207-001
0207-002
0207-003
0207-004
0207-005
0207-006
645 Programmable Treadmill Controller
Handrail Mount 0222-001
Table Top 0222-002
Rack Mount 0222-003
Treadmill Controller
Q55 Treadmill
Q65 Treadmill
1.5 ACCESSORIES
14544-001
14544-002
The following accessories are shipped with the
Q55/Q65. Your Quinton sales or service
representative will inventory these items
during installation.
Accessory
Handrail Assembly
Handgrip,
Fabric
Operator Manual
1.6 OPTIONS
Part Number
12976-001
13802-001
0208-841
The following options are available for the
Q55/Q65:
1.6.1 Power Options
Q55 Option
230V, 60Hz, Single phase
230V, 50Hz, Single phase
100V, 60Hz, Single phase
100V, 50Hz, Single phase
208V, 60Hz, Single phase
l15V, 60Hz, Single phase
Q65 Option
230V, 60Hz, Single phase
208V, 60Hz, Single phase
Part Number
0208-001
0208-002
0208-003
0208-004
0208-005
0208-006
Part Number
0221-001
0221-005
Treadmill users are advised that an
autotransformer should not be used to increase
115 Vac to 230 Vac to run the treadmill.
Consult your local licensed electrician to
correct the voltage at your facility.

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1.6.2 Hardware Options (a55/a65)
Option
Overhead Mask Support
Side Handrail, Short
Side Handrail, Long
Emergency Off Switch
Ca theter Arm Support
1.7 SPECIFICATIONS
1.7.1 a55 Specifications
Performance
Part Number
13689-001
13690-001
13691-001
13675-001
0043-002
Maximum rated load: 350 Ib (159 kg), Bruce
Protocol
Belt speed range: 1 to 10 mph (1.6 to 16 kph),
continuously adjustable
Elevation range: 0 to 2596 grade (0 to 14°)
Power options:
100 Vac, 1 PH, 50 or 60 Hz, 24 A
115 Vac, 1
PH, 60 Hz, 24 A
230 Vac, 1 PH, 50 or 60 Hz, 12 A
208 Vac, 1 PH, 60 Hz, 12 A
Minimum
branch circuit requirements:
100 Vac -30 A
115Vac-30A
208 Vac- 15 A
230 Vac-15 A
NOTE
The branch circuit must be dedicated to
the Q55 only. If used with a Q2000, do
not connect the Q55 and the Q2000 to
the same circuit.
En vironmental
Operating temperatures: 60 to 95°P (15 to
35°C)
Storage temperatures: 0 to 120
0P (-18
to 49°C)
Humidity: 30 to 9096, noncondensing
Physical
Nominal walking area: 20 x 55 in (51 x 140 cm)
Ploor space required: 28 x 76 in (71 x 193 cm)
Walking
surface height: 5.3 in (13.5 cm)
Handrail height: 43 in (l09 cm) above floor
Weight: 400
lb (l81 kg)
Shipping weight: 500 Ib (227 kg)
1.7.2 a65 Specifications
Perf ormance
Maximum rated load: 400 Ib (l81 kg), Bruce
Protocol
Belt speed range: 1.5 to 15 mph (2.4 to 24
kph), continuously adjustable
Elevation range: 0 to 2596 grade (0 to 14°)
Power options:
230 Vac, 1 PH, 60 Hz, 16 A
208 Vac, 1 PH, 60 Hz, 16 A
Minimum
branch circuit requirements:
230 Vac -20 A
208 Vac -20 A
NOTE
The branch circuit must be dedicated to
the Q65 only. Do not connect the Q65
and the Q2000 to the same circuit.
Environmental
Operating temperatures: 60 to 95°P (I5 to
35°C)
Storage temperatures: 0 to 1200P (-18 to 49°C)
Humidity: 30 to 9096, noncondensing
Physical
Nominal walking area: 20 x 65 in (51 x 165 cm)
Ploor space required: 28 x 86 in (71 x 218 c m)
Walking surface height: 5.3 in (13.5 cm)
Handrail height: 44 in (Ill cm) above floor
Weight: 425 Ib (193 kg)
Shipping weight: 600 Ib (272 kg)
1-3

1.8 OPERATOR MANUAL
A comprehensive operator manual is supplied
with this equipment. You may order
additional copies by writing to Quinton
Instrument Company, 2121 Terry Avenue,
Seattle, Washington 98121; or by calling our
Customer Service Department at (800)
426-0347.
1.9 REFERENCES
The following references were used in the
preparation of this manual:
1. Operator manual for the Model Q55/Q65
Medical Treadmill, PIN 0208-841
2. Operator manual for the Quinton Model
Q2000 Stress Test Monitor, PIN 0207-840
3. Service manual for the Quinton Model
Q2000 Stress Test Monitor, PIN 0207-830
4. Technical
Programmable
0222-830
1-4
manual for the Model 645
Treadmill Controller, PIN

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SECTION 2. OPERATION
2.1 INTRODUCTION
This section contains the reCeIVing, unpacking
and inspection, and installation procedures.
2.2 RECEIVING
Before leaving the factory, the Q55/Q65 is
thoroughly inspected and tested for proper
operation. To minimize shipping damage, the
Q55/Q65 is shipped in a specially designed
packing crate. The Q55 weighs 500 lb. (272
kg) and
the Q65 weighs 600 lb. (272 kg).
Quinton
Instrument Company's responsibility
for this shipment ends upon delivery to the
carrier, who assumes responsiblity for safe
delivery. Therefore, when damage or loss to
merchandise shipped FOB Factory is sustained
in transit, claims must be made by the
customer and directed to the carrier.
When shipments are sent FOB Destination,
Quinton Instrument Company will file the
claim, provided we are furnished with an
acceptable inspection report from the carrier.
If a claim is disallowed because of failure to
obtain the report, repair charges will be billed
to the customer.
Upon receipt of the shipment, the containers
or units should be inspected for external
damage. Discrepancies should be noted on the
waybill, which should then be signed by the
carrier's agent. Failure to adequately describe
external evidence of loss or damage on the
waybill may result in the carrier refusing to
honor the claim.
2.3 UNPACKING AND INSPECTION
The front handrail assembly and the operator
manual arc shipped with the Q55/Q65 Medical
Treadmill as standard equipment. These items
are not listed on the waybill.
1. Inspect the shipping crate for evidence of
damage.
2. Pull the nails out of the lower skirting of
the crate.
3. Cut the bands.
4.
Lift the top of the crate straight up off
the pallet.
5. Remove the plastic sheeting.
6. With the aid of a second person, lift the
flat end of the treadmill no more than 6 inches
off the pallet.
Lifting from the wrong end of the
treadmill or lifting more than 6 inches off
the pallet or floor can damage the
treadmill.
Limit switches on the underside of the
treadmill can break if the treadmill is not
lifted carefully off the pallet.
7. Ease one of the front wheels off the
pallet.
8. Ease the second wheel off the pallet.
9. Roll the treadmill into the desired
position.
10. Install the handrail by positioning on the
two supports provided on the headframe.
2.4 INSTALLATION CHECKOUT PROCEDURE
WARNING I
Do not start belt when anyone is
standing on it.
1. Verify that the service outlet voltage
matches the voltage on the nameplate. If
using the Q2000 as the treadmill controller,
verify that the treadmill alld the Q2000 are on
separate branch circuits.
2. Plug the Q55/Q65 power cord into the
service outlet.
2-1

3. Inspect treadmill connector 2A4W2Jl for
damage,
then connect the control cable (PIN
13102-001)•
4. If using the Q2000 as the treadmill
controller, perform the following steps. If no
error codes appear during performance of the
test, the treadmill is operational.
a. Ensure that the checkout procedure in
Section 2.3 of the Q2000 Operator Manual
(P IN 0207-840) has been performed.
b. Run treadmill calibration (Steps 1, 2 and 7
of Section 4.4 of Q2000 Service Manual)
and
store data.
c. Press MASTER RESET.
d.
If AUTO TM red LED is on, press AUTO
TM to return treadmill to manual
operation.
e. Press START.
f. Using speed and grade, increase and
decrease ( ...... and".) controls. Verify that
the treadmill can be controlled manually
2-2
through the entire range specified for
both speed and grade.
g.
Press STOP and verify that treadmill
stops.
5. If using Model 645 Programmable
Treadmill Controller as the treadmill
controller, perform the checkout procedure in
Section 2.3 of the Model 645 Programmable
Treadmill Controller Technical Manual (PIN
0222-830).
6. If using Quinton's Treadmill Controller,
perform the following steps.
a. Ensure that CABLE CO NN LED is on.
b. Press RUN
to start the treadmill.
c. Using SPEED and ELEV (grade) increase
and decrease keys, verify that the
treadmill can be controlled manually
through
the entire range specified for
both speed and grade.
d. Press STOP and verify
that treadmill
stops.

-
-
-
-
SECTION 3.
,
THEORY OF OPERATION
3.1 INTRODUCTION
The Q55/Q65 Medical Treadmill uses one
motor
to drive a walking belt, one motor to
change the speed of the walking belt and one
motor to change the grade (elevation) of the
treadmill .. , The treadmill is considered Unit 2
of Quinton's Q Series of stress test products.
It can be controlled by any of the following
treadmill controllers (the controller is
considered Unit
I): the Q2000 Stress Test
Monitor,
the Model 645 Programmable
Treadmill
Controller or Quinton's Treadmill
Controller. The Q55 and Q65 are functionally
identical and use identical cable interfaces to
the various types of controllers. The Q55
operates between I and 10 mph (l.6 and 16
kph), and the Q65 operates between 1.5 and 15
mph (2.4 and 24 kph).
A
drive motor provides the motive force to
turn the treadmill drive pulley and move the
walking belt. An arrangement of shafts, belts
and pulleys, including a variable speed belt,
allows a moveable
sheave on the input shaft to
affect the rate of rotation of the output shaft
and the walking belt.
A reversible speed change motor moves the
speed change spindle assembly and moveable
sheave along the input shaft to effect changes
in
the speed of the walking belt. A
tachometer is linked to the output shaft to
monitor the speed of the walking belt.
A
grade motor turns a pinion shaft to raise and
lower the headframe of the treadmill on two
x:ack gears. A grade potentiometer linked to
the pinion shaft by a chain and sprockets
allows grade change to be monitored.
A printed
circuit board (PCB) assembly
contains electrical and electronic elements
necessary for motor control and treadmill
controller interface. Signals from the
controller initiate start/stop, speed increase
or decrese, grade change and grade direction
change. Feedback signals from the
tachometer, grade potentiometer, drive
motor,
treadmill control cable and walking
belt are routed through the PCB to the
treadmill controller.
Figure 3-1 shows treadmill components and
figure 3-2 shows the functional block diagram
for
the Q55/Q65 Medical Treadmill. Figure
3-2 is
located at the end of Section 3.
3.2 PRINTED CIRCUIT BOARD (PCB)
Motor control relays, fuses and electronic
circuits are mounted on the printed circuit
board (PCB) 2Al. Mounted on the back of the
PCB bracket are drive motor contactor 2Kl
and
transformer 2Tl. Connector 2AIPll on
the PCB provides the interface between the
treadmill controller (Unit I) and the treadmill
(Unit 2). Circuits on the PCB and electrical
components are described in this section as
they relate to the treadmill subassemblies that
they control or monitor.
3.3 POWER SUPPLY
Line voltage is available to treadmill control
circuits on the PCB when the power cord is
plugged in. Power
is routed directly through
connectors 2AIPI and 2AIP6 to the motors
and fan. Line voltage is
stepped down through
transformer 2Tl before it goes to the power
supply
circuit on the PCB. Transformer 2Tl
also provides electrical isolation from primary
power.
The power supply
circuit uses a diode bridge
rectifier, filters and voltage regulators
2Al VR I and 2Al VR2 to supply +24 Vac to the
power supply monitor circuit and +12 Vdc and
+23 Vdc to other PCB circuits.
A +24 Vac power supply monitor circuit uses a
rectifier/filter, a low voltage comparator, a
pulse
stretcher and an output driver to sense
and
indicate low line voltage. Sensitivity can
be adjusted by the trip level potentiometer.
When .low line voltage is sensed, the LO
VOLTS LED on the PCB lights and feedback is
sent to the treadmill controller.
A +23 Vdc continuity test circuit on the PCB
also monitors
the treadmill control cable
connection to ensure that there is no break in
continuity. A CABLE
OK LED lights on the
PCB unless there is a break in the plug
connection circuit. Feedback goes to the
treadmill controller if a break is detected.
The cooling fan 2Fl is on any time the drive
motor is on.
3-1

3·2
4-----
3---
2----r-
1---+
5 6 7 8 9 10 11 12 13
1 Headframe
2 Tachometer
assembly
3 Drive motor
4 Printed circuit board
5 Grade motor
6 Grade potentiometer
7 V-belts
8 Pinion shaft
9 Cooling fan
10 Input shaft
11 Fixed sheave
12 Variable speed belt
13 Moveable sheave
14 Rack gear
15 Speed change
spindle assembly
16 Speed change motor
17 Timing belt
18 Output shaft
19 Drive pulley
20 Walking belt
.......... ----14
---15
--16
------17
--18
19
----20
Figure 3-1 055/0S5 Medical Treadmill Components

Table 3-1 Drive Motor Specifications
QUINTON
FREQUENCY
PART
USED
(SINGLE
NUMBER ON VOLTAGE PHASE)
13657-001 Q55 208-240 Vac 60 Hz
13657-002
Q55 110-120 Vac 60 Hz
13657-003 Q55
200-240 Vac
50 Hz
13657-004
Q55
100-120 Vac 50 Hz
14560-001
Q65
208-240 Vac
60 Hz
3.4 DRIVE MOTOR
The drive motor 2M2 provides the motive
force to turn the treadmill drive pulley and
move
the walking belt. Table 3-1 shows motor
specifications for different motors used in the
Q55 and Q65. All are continuous duty, single
phase
motors that have internal overload
protection.
Drive motor contactor 2K 1 turns on or shuts
off the drive motor when a signal from the
treadmill controller energizes the motor
contactor driver latch circuit on the PCB.
The +23 Vdc motor contactor driver/latch
circuit responds to a START or STOP signal
from
the treadmill controller. It uses a driver
and a latch to keep the motor started or
stopped. A signal from the motor overload
latch circuit or the EMERGENCY OFF switch
overrides any commands to start or stop the
motor.
The +
12 Vdc motor overload latch circuit uses
optical isolator 2Al U5 to monitor a thermal
sensor in the motor or motor contactor. When
the motor overloads, the optical isolator
actuates this circuit to disable the motor
contactor driver/latch circuit. The treadmill
will not restart until the motor's thermal
sensor has cooled and reset and the START
switch is pressed. The circuit also lights the
MOTOR LED on the PCB and sends feedback
to the treadmill controller if an overload
condition
occurs. The MOTOR LED will stay
on until the thermal overload has cleared and
the treadmill has been restarted.
3.5 INPUT SHAFT, OUTPUT SHAFT, BELTS
AND PULLEYS
HP
1 1/2
1 1/2
1 1/2
1 1/2
3
FULL
FULL
LOAD LOAD
RPM
CURRENT
1725 7
1/2 amps
1725
15 amps
1425 8
amps
1425 16
amps
3540
15 amps
An input shaft, an
pulleys function as
Q55/Q65. Figure
arrangement. The
describe shaft, belt
detail.
3
2
1
Drive motor output
shaft
2 V-belts
3 Machined pulley
4 Input shaft
5 Input shaft fixed
sheave
INSULATIO N
CLASS
MOUNT
B
Resilient
B
Resilient
B
Resilient
B
Resilient
B
Solid Base
output shaft, belts and
a transmission on
the
3-3 illustrates this
following paragraphs
and pulley operation in
7
n
--8
;....--9
;;..---10
r--o----11
-------12
14 13 8 Speed change
~ spindle assembly
15 9 Variable speed belt
10 Timing belt
11 Output shaft
12 Drive pulley
13 Output shaft fixed
sheave
6 Input shaft moveable
sheave 14 Output shaft
moveable sheave
15 Output pulley
Input Shaft, Output Shaft, Belts
and Pulleys
7 Input pulley
Figure 3-3
3-3

3.5.1 Input Shaft
The input shaft is equipped with a machined
pulley,
the fixed and moveable sheaves that
comprise the input pulley, and the speed
change spindle assembly. Two V-belts link the
drive motor output shaft with the input shaft.
The input shaft turns at a fixed rate.
The speed change spindle assembly consists of
a fork, a speed change spindle and a yoke. As
the speed change motor turns the spindle, the
fork moves laterally on the input shaft in
tandem with the moveable sheave. 'The
~unction .o.f the speed change spindle assembly
IS to posItIon the moveable sheave on the input
shaft.
3.5.2 Output Shaft
The output shaft is equipped with a spring, the
moveable and fixed sheaves that comprise the
output pulley, and a timing pulley, The output
shaft turns at a variable speed depending on
the pitch diameter of the output pUlley.
3.5.3 Variable Speed Belt
A variable speed belt links the input pulley and
the output pulley. Because the four sheaves in
the arrangement are graded, the variable
speed belt can be forced in or out between
pairs of sheaves to increase or decrease pitch
diameter. Spring tension against the moveable
sheave on
the output shaft tends to force the
belt outward, increasing the pitch diameter of
the output pulley. When the speed change fork
moves
the moveable sheave on the input shaft
~nward, the pitch diameter of the input pulley
Increases and causes a concurrent decrease in
the pitch diameter of the output pulley. This
turns the output shaft at an increased rate.
3.5.4 Treadmill Drive and Idler Pulleys
The timing pulley on the output shaft drives
the treadmill drive pulley. The drive pulley, in
turn, drives the walking belt and the treadmill
idler pulley.
3.6 WALKING BELT AND BELT TRACKING
SWITCHES
The walking helt is the tread mill conveyor
belt. Two factory-set limit switches on the
underside of the treadmill deck monitor the
lateral movement of the walking belt. If the
walking belt comes close to touching an edge
3-4
of the treadmill drive pulley, one of the
switches actuates. If a switch actuates, the
BELT LED on the PCB automatically lights
and a message is sent to the treadmill
controller that a hazardous condition exists.
On the Q2000, the message TREADMILL BELT
TRACKING ERROR
appears on the screen.
On the 645 PTC, the BELT TRACKING LED in
the SELF TEST box lights. On the Treadmill
Controller panel, the BELT TRACK LED lights.
3.7 SPEED CHANGE MOTOR ASSEMBLY
The speed change motor assembly 2A2 consists
of a reversible, spli t-capacitor gear motor
2A2M I and the speed change capaci tor
2A2CI. The speed change motor is linked by a
chain and sprockets to the speed change
spindle assembly that moves the assembly
laterally along the input shaft. The speed
change capacitor provides the phase shift
necessary to start the motor. The motor
cannot be operated unless the drive motor is
also on.
Relay
drivers 2Al V3 on the PCB receive logic
level signals from the treadmill controller and
deliver appropriate voltage to the appropriate
speed change motor relay. Speed change
motor relay 2AIK3 controls speed increse, and
speed change motor relay 2AIK4 controls
speed decrease. Relay 2AIK3 is also a lockout
relay to prevent both relays from energizing
simultaneously.
3.8 TACHOMETER ASSEMBLY
Tachometer assembly 2A3 uses an optical
emitter and a sensor that run on +12 Vdc from
the PCB. The sensor measures the rate of
light beam interruptions caused by a rotating
beam chopper. The resulting variable
frequency pulses are converted by the
tachometer circuit into a dc voltage
proportional to the speed of the treadmill.
The . tachometer circuit uses frequency
d.oublmg pulse amplifier 2AI VI and a low pass
fIlter (also 2A 1V 1) to convert the variable
frequency pulses received from the
tachometer. The output of the filter is
l'eferenced to +12 Vdc. The tachometer
current source then changes the voltage signal
to a current signal and transmits the current
signal back to the treadmill controller.
Tachometer gain potentiometer 2AIR13
allows
calibration of the tachometer current

-
source so that 1 milliampere represents a rate
of 1 mile per hour.
3.9 GRADE MOTOR
Grade motor 2Ml is a right angle gear motor.
The motor
shaft is linked to a pinion shaft by a
chain
and sprockets. The chain turns a
sprocket on the pinion shaft to raise and lower
the headframe of the treadmill on two parallel
rack gears.
Relay drivers 2Al U3 on the PCB receive logic
level signals from the treadmill controller and
deliver
appropriate voltage to grade change
relay
2AIKl or grade direction change relay
2AIK2.
Grade change relay 2AIKl starts or stops the
grade motor. It works with relay 2AIK2 to
increase or decrease grade, depending on the
polarity of the direction control windings.
Grade
direction change relay 2A 1 K2 controls
the polarity of the direction control windings
in
the grade motor. The change in polarity
does not
cause the grade motor to turn,
although it alters the direction that the grade
motor shaft will spin. The.2 second delay
circuit on the PCB delays the signal to relay
2AIK2 to ensure that the grade motor stops
completely before changing direction.
3.10 PINION SHAFT AND RACK GEARS
The pinion shaft and rack gears allow the
entire headframe assembly to tilt for grade
increase or decrease. The pinion shaft rotates
two sprockets at either end to move up and
down a
parallel pair of rack gears. Mechanical
stops at the top of the rack gears prevent
upward overtravel, while the deck prevents
downward overtravel. The pinion shaft has a
torque limiting device to prevent damage to
the grade motor if it continues to turn at the
upper or lower limits of travel.
3.11 GRADE POTENTIOMETER
Grade potentiometer 2R 1 monitors the
rotation of the pinion shaft to indicate
changes in grade. The potentiometer is linked
to the pinion shaft by a pair of sprockets and a
chain. The
potentiometer runs on + 12 Vdc
from the PCB. The voltage signal from the
potentiometer is changed by the grade current
source on the PCB to a current feedback
signal
that goes to the treadmill controller.
Grade zero potentiometer 2AIR29 allows
calibration of the grade current source when
the grade angle is zero so that an increase in
voltage represents an increase in grade.
Grade gain
potentiometer 2AIR30 allows
calibration of the grade current source so that
a I milliampere change represents a 296
change in grade.
3-5/3-6 Blank