Teledyne MODEL T703 9.2.5. POWER SUPPLY AND CIRCUIT BREAKER

Theory of Operation Teledyne API T703 Calibrator Operation Manual
160
9.2.4.5. External Digital I/O
The external digital I/O performs two functions.
The STATUS outputs carry logic-level (5V) signals through an optically isolated 8-pin connector on the rear
panel of the calibrator. These outputs convey on/off information about certain calibrator conditions such as
CONC VALID. They can be used to interface with certain types of programmable devices.
The CONTROL outputs can be used to initiate actions by external peripheral devices in conjunction with
individual steps of a calibration sequence (see Section 6.5.1.6).
The CONTROL inputs can be initiated by applying 5V DC power from an external source such as a PLC or data
logger (Section 6.5.1.5). Zero and span calibrations can be initiated by contact closures on the rear panel.
9.2.4.6. I2C Data Bus
I2C is a two-way, clocked, bi-directional, digital serial I/O bus that is used widely in commercial and consumer
electronic systems. A transceiver on the motherboard converts data and control signals from the PC-104 bus to
I2C. The data is then fed to the relay board, optional analog input board and valve driver board circuitry.
9.2.4.7. Power-up Circuit
This circuit monitors the +5V power supply during calibrator start-up and sets the analog outputs, external digital
I/O ports, and I2C circuitry to specific values until the CPU boots and the instrument software can establish
control.
9.2.5. POWER SUPPLY AND CIRCUIT BREAKER
The T703 calibrator operates in two main AC power ranges: 100-120 VAC and 220-240 VAC (both ± 10%)
between 47 and 63 Hz. A 5 ampere circuit breaker is built into the ON/OFF switch. In case of a wiring fault or
incorrect supply power, the circuit breaker will automatically turn off the calibrator.
NOTE:
The T703 calibrator is equipped with a universal power supply that allows it to accept any AC power
configuration, within the limits specified in Table 2-2.
CAUTION
Should the power circuit breaker trip correct the condition causing this situation before
turning the calibrator back on.
07223B DCN6378