beautypg.com

Life Fitness 93T User Manual

Page 169

background image

4-6

P1

P3

JW1

P5

P6

SERVICE
LED

LED1

LED2

JW7

JW6

P2

P4

Life Fitness Model 97Te, 95Te, 97Ti, 95Ti and 93T Arctic Silver Treadmills

ELECTRONIC OVERVIEW – MOTOR CONTROLLER PCB


FUNCTIONAL DESCRIPTION

The Motor Controller PCB is a single phase AC input PWM variable frequency three (3) phase AC output motor
controller. Specifically the controller input is configured as a full wave bridge for 230 volt AC input, and as a voltage
doubler for 120 volt AC input. The resultant DC bus voltage is processed through a microprocessor controlled six
switch DC to AC inverter. The output is three phase power with pulse width modulation of both voltage and
frequency.

NOTE: The motor controller design utilizes a ‘hot’ supply. This means the entire board will be at elevated potentials
relative to earth ground any time the circuit is active. All measurements should be conducted with isolated
equipment. Additionally there is considerable energy stored within the circuitry for up to 90 seconds after power is
removed from the circuit. Personnel working with this equipment should be trained and adequate precautions
should be used whenever working with this equipment.