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Teledyne API Model T360/T360M Operation Manual Principles of Operation
213
7.4.5.1. HEATER CONTROL
The two heaters attached to the sample chamber housing and the GFC wheel
motor are controlled by solid state relays located on the relay board.
The GFC wheel heater is simply turned on or off, however control of the bench
heater also includes circuitry that selects which one of its two separate heating
elements is activated depending on whether the instrument is running on 100
VAC, 115 VAC or 230 VAC line power.
7.4.5.2. GFC WHEEL MOTOR CONTROL
The GFC wheel operates from an AC voltage supplied by a multi-input
transformer located on the relay board. The step-down ratio of this transformer is
controlled by factory-installed jumpers to adjust for 100 VAC, 115 VAC or 230
VAC line power. Other circuitry slightly alters the phase of the AC power
supplied to the motor during start up based on whether line power is 50Hz or 60
Hz.
Normally, the GFC Wheel Motor is always turning while the analyzer is on. A
physical switch located on the relay board can be used to turn the motor off for
certain diagnostic procedures.
7.4.5.3. ZERO/SPAN VALVE OPTIONS
Any zero/span valve options installed in the analyzer are controlled by a set of
electronic switches located on the relay board. These switches, under CPU
control, supply the +12VDC needed to activate each valve’s solenoid.
7.4.5.4. IR SOURCE
The Relay board supplies a constant 11.5VDC to the IR Source. Under normal
operation the IR source is always on.
7.4.5.5. STATUS LEDS
Eight LEDs are located on the analyzer’s relay board to show the current status
on the various control functions performed by the relay board (see Figure 7-17).
They are:
07272B DCN6552