6
II.
Theory of Operations
The following is a theory of operation that encompasses all the electrical
components, their functions, and how they interact with each other.
Independent electrical components found in SCIFIT’s Cordless product line:
1.
Lower PCB (Power Supply)
2.
Upper PCB (Display)
3.
Generator/Electromagnetic Brake
4.
12 Volt Battery
5.
Wall Pack Receptacle
6.
Hand Grip Heart rate PCB (HG HR)
7.
Wireless Heart rate PCB (Polar)
Component Functions
1. Lower PCB (Power Supply)
A.
Converts the12 to 400 volts AC from the generator into 12 volts DC
using switching power supply technology.
B.
Provides 12 volts DC to upper PCB.
C.
Accepts 12 volts DC from either the battery or wall pack
transformer if unavailable from the generator
D.
Receives Pulse Width Modulation (PWM) signal from the upper
PCB for brake control.
E.
Contains Hi-power MOSFET circuitry that controls the brake.
2. Upper PCB (Display)
A.
Accepts commands from a user.
B.
Displays information to the user.
C.
Regulates 12 volts DC from lower PCB down to 8 volts DC and 5
volts DC.
D.
Operates the 8 and 5 volt DC serial communications (c-safe and
cardio-key)
E.
Provides 5 Volts DC to the contact and wireless heart rate jacks.
F.
Receives signals from the contact and wireless heart rate PCB’s.
G.
Contains 5 volt DC display (LED) drivers.
H.
Contains the 5 volt DC memory and processor components.
I.
Provides PWM signal to lower PCB for brake control.
3. Generator/Electromagnetic Brake
Generator:
o
A three (3) phase generator that produces 0 to 400 volts AC
depending on the RPM’s.
o
Provides AC voltage to the lower PCB.
Summary of Contents for ISO7000R
Page 66: ...66...
Page 67: ...67 See page 68 for breakdown of item numbers 59 and 60...
Page 69: ...69 See page 70 for breakdown of item number 64...
Page 71: ...71...
Page 74: ...74 B Assembly Drawings and Part List 570 005000 thru 570 005295...
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Page 76: ...76 See page 77 for breakdown of item numbers 59 and 60...
Page 78: ...78 See page 79 for breakdown of item number 64...
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