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Theory of Operation
Power Board (PCB) Theory
General Description
The power board and processor board function together as part of the e-box to
control the T2100 Treadmill. The power board contains the following:
• Mains components
• Isolation transformer
• Elevation and drive interface circuitry
• Interface to processor board
Precautions
Handling of this power board or harness should be done by qualified service personnel
observing customary EST protections procedures.
Initial Board Conditions
The power board initial conditions are all at 0V.
Power Input Requirements
The T2100 Treadmill is used on single phase AC. The specific power ratings are
200-240VAC, 50-60 Hz, 16A.
Power Distribution/Isolation
The power board receives 200 to 240VAC power (nominal 220V). The isolation
transformer supplies 12V to two switching regulators. The switching regulators supply
+5V to both the isolated side and the non-isolated side of the processor board. Bypass
caps are distributed across the board to minimize EMI and power supply noise.
Power Inlet, Drive Power Outlet & Mains
The power comes in on the terminal block, gets fused and filtered, and is distributed
to the isolation transformer, out to the drive system and to a +24V power supply.
Externally accessible T 0.5AL fuses are provided for the control portion of the circuitry.
A 2.5 Amp internal fuse is dedicated to protecting the +24V power supply. The 20 Amp
internal fuses are for the drive section and are intended to protect the wiring from
major faults within the drive system. Spacings for creepage and isolation are critical in
this whole section.
Power Supplies
There are two identical power supplies. One is for the microcontroller power and the
serial link, the other is for signal interface to the control drive. The isolated serial link
supply provides 5-volt power to operate a manual controller and the control circuitry
on the processor board.
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T2100 Treadmill
2021403-120F
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Troubleshooting
