Measurement-computing eZ-TOMAS version 7.1.x Manual do Utilizador descarregar pdf (Página 35)

eZ-TOMAS & eZ-TOMAS Remote 887591 Edit Menu 3-9

Tach Section of the Input Channels Tab

Rotation

is the shaft’s rotation direction, either clockwise or counter-clockwise. The direction

indicated is as viewed from the driver end of the machine train.

Pulse/Rev

is the number of pulses per 360 degree revolution. (Default: 1)

RPM Mult.

Used to enter an RPM multiplier value. This is useful if your tachometer is measuring an

RPM that is proportional to another value of interest, such as in a gear train. For

example, you want to see the RPM for shaft “X” which is known to turn at 2.5 times the

RPM of gear “Z;” but it is impractical for a tachometer to measure the RPM of the shaft

by any direct means. In this case, we would enter a multiplier of 2.5 for the gear’s RPM

to obtain the shaft’s RPM.

Auto Tach

If a Analog Input Channel is defined as a Tachometer Input. You can either manually

specify a trigger level or use the Auto-Tach detection option.

During acquisition eZ-TOMAS can automatically detect and adjust the analog tach’s

trigger settings. This can be useful when the tach signal changes voltage levels during

machine operation.

Trig Dir

is the “negative’ [down arrow] or “positive” [up arrow] direction of the moving shaft.

Trig Volt

defines the Tach pulse for tach signals. A

keyway

will generate a Negative Tach pulse.

Typical Tach signals will generate at least a 1 V pulse. You can check the voltage value

using a Time display.

Mode

Used to select one of three available modes: Voltage, Counter, or Period.

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Measurement-computing eZ-TOMAS version 7.1.x Manual do Utilizador Página 35