SCIFIT ISO7000R User Manual download pdf (Page 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.

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SCIFIT ISO7000R User Manual Page 6