Precor GEN06 Series C952 Service Manual page 111

120V and 240V configurations in the United States.
CAUTION: The treadmill requires a 20-amp individual branch circuit grounded per
NEC (National Electric Code) guidelines or local region electric code.
120v power, when measured from hot to neutral, should read between 90 and 132v. 240v
power, when measured from hot to neutral should read between 180 and 264v. This input
voltage is applied through the power entry plug and wired to the breaker switch. The 120v
breaker switch only interrupts the hot line and the 240v breaker switch interrupts both the hot
and neutral lines. The power is then fed through a line filter which removes high frequency
noise from the line voltage. After the power is cleaned by the line filter it can be applied to the
lower electronics module (IFT drive).
Review electrical requirements, see
Lower Electronics Module (IFT module)
The lower control module consists of an AC drive motor controller, an AC lift motor controller
and a +8.5 Vdc power supply to power the console.
The electronic circuits in the console operate on +5 Vdc, however the lower control module
sends +8.5 Vdc due to the optional external equipment such as Fitlinxx products connected to
the CSAFE (communication standard for all fitness equipment) port. Sending a higher voltage
(+8.5 Vdc) and regulating the voltage down to +5 Vdc ensures enough supply power to sup-
port both the console and the optional external equipment.
It is important to note that the lower control module (IFT module) has different part numbers
for the 120 Vac unit the 240 Vac treadmill.
AC Drive Motor Controller
The AC drive system controls the three phase AC drive motor. In an AC motor, speed is con-
trolled by frequency independent of voltage or current, torque is controlled by the voltage/-
current applied to the motor 3 phase windings. The windings (stator) and rotor core of the
motor are designed to spin at a specific speed at the design frequency. The lower control mod-
ule generates the correct frequency to drive the motor at the command speed. Since the
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"General Information" on
8 Theory of Operation
Treadmill Base Operation
page 3.
105