Power Board (Pcb) Theory; General Description; Precautions; Initial Board Conditions - GE T2100 Service Manual

Power Board (PCB) Theory

General Description

Precautions

Initial Board Conditions

Power Input Requirements

Power Distribution/Isolation

Power Inlet, Drive Power Outlet & Mains
5-4
Theory of Operation: Power Board (PCB) Theory
The power board and processor board function together as part of the e-
box to control the GE T2100 Treadmill. The power board contains the
following:
Mains components
!
Isolation transformer
!
Elevation and drive interface circuitry
!
Interface to processor board
!
Handling of this power board or harness should be done by qualified
service personnel observing customary EST protections procedures.
The power board initial conditions are all at 0V.
The GE T2100 Treadmill is used on single phase AC. The specific power
ratings are 200-240VAC, 50-60 Hz, 16A.
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.
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 0.5ASB 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 25 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.
GE T2100 Treadmill
2021403-031
Revision A