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Tonnage Load Monitor (optional)
Term Defi nitions
Alarm. A reading that is out of the high or low limit range
causing the relay to de-energize. Once alarmed, the
relay opens to stop the press/machine.
Balance. The balance adjustment equalizes the sensor
to the monitor. The balance pot is used to bring the
display to zero.
Calibration Number. A reference value dialed in during
the calibration process. When the calibration number is
correct, the gain/span settings are correct.
Calibration. The process in which the Tonnage Monitor
mounted on the machine is adjusted to read the same
tonnage as the reference load cells in the bed of the
press.
Cam Input. A switching input to the unit allowing tonnage
to be read at a certain position in the stroke. It is usually
obtained from a rotary cam wheel or a programmable
limit switch. (Only 24 VDC devices.)
Compression. The force generated by the sensor or
load cell by compressing. It is usually found in the rear
of a C-Frame press or on a Pitman arm.
Gain / Span. Gain, also called Span, is the amplifi cation
used by the monitor. A small amount of elongation of
the sensor needs a large amount of gain to show a high
reading. The gain is adjusted during calibration.
Reverse Load. The “snap through” or damaging
negative forces occurring in the machine. Typically, the
snap through rating is 10% of the capacity of the press.
Shut Height. The distance from the top of the bed of the
press to the bottom of the ram when on BDC. Most OBI/
OBS presses have a shut height of approximately fi fteen
inches and a ram adjust of approximately four inches.
Track Mode. When using the track mode, the output
will adjust between 0 and 9VDC. The value goes back
to 0V when there is no load.
Peak Mode. When using the Peak Mode the output will
hold the highest force seen during the time the probe
switch is on. Most PLC units use this mode.
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