Life Fitness T3 Service Manual page 52

Life Fitness T-Series Consumer Treadmills
ELECTRONIC OVERVIEW – MOTOR CONTROLLER PCB
Functional Description
The Motor Controller PCBs are designed to act as an interface between the Drive motor, Display Console, and the
Lift Motor. The desired belt speed and elevation is sent down to the motor controller and lift motor via the users
selected input into the console. The motor is driven by a fixed frequency variable duty cycle signal. If an error
condition is detected the main power relay is opened, the PWM pulse is terminated, and the console is informed.
The main power relay receives its bus voltage from the console through the emergency pull switch. This relay can
be energized by having the emergency pull switch is in its proper place. Opening of the relay does not remove
power to the console or the logic on the motor control board, but will interrupt power to the lift and drive motors.
P5,3
P5,2
P5,1
Connector and Pin Functions
Connector
Service LED
Test Point
6
P7
P4
TP7
P6,1
Location Pin
See illustration LED 1
above
LED 2
LED 3
LED 4
See illustration TP 1
above
TP 2
TP 3
TP 4
TP 5
TP 6
TP 7
P3
LED1,2,3,4
TP5
P6,2
Functional Description
Main loop monitor
Communication monitor
Home switch monitor
RPM monitor
+8 vdc for console
Ground return for TP1
+5 vdc for microprocessor on motor controller
15 vdc
15 vdc
Ground return for TP3 and TP5
Ground
Section 4
TP4
TP3
TP6
P1
TP1
TP2