© Precor Incorporated, Unauthorized Reproduction and Distribution Prohibited by Law Page 28
AC Lift System – Motion Control
The motor used in the lift system is a "Permanent Split Capacitance"
type, single phase AC motor. What this means is that the motor
incorporates the use of a capacitor to provide the torque required to
lift the weight of the user as well as the weight of the unit. Power to
the lift motor is provided directly from the AC coming into the unit.
In order to turn the motor in 2 directions, the AC motor has 2 separate
windings, one for up and one for down. AC1 has a continuous connection to
the center / common connection of the motor.
The system has a 2A fuse to protect the components from over-current
failure.
When a control signal is applied to the "UP" input, TRIAC 1control line
is active and turns on the up triac. This directs the AC2 connection to
the up winding of the motor, causing the motor to spin in the up
direction.
When a control signal is applied to the "DOWN" input, TRIAC 2 control
line is active, turns on the down triac. This directs the AC2 connection
to the down winding of the motor, causing the motor to spin in the down
direction.
To Next Page
Loading...
Need help?
General