LINK Systems OmniLink 5000 - Manual (Page 73)

April 17, 2000 Man ual Revisio n 1.0
8.5
Vibratory motion in the machine often introduces stroke to stroke variations of one or two percent in
the load cell tonnage readings. When this happens it is impractical to try to refine the load on the
machine any closer than within one or two percent of rated tonnage.
l) After loading the machine to the tonnage at which it is to be calibrated as per step “k” of this
calibration procedure, access the T/M Configuration menu of the OmniLink 5000 Tonnage Monitor
Module and select Calibration and Channel Description (refer to Section 5.3) to enter the Dynamic
Calibration mode.
For a two channel OmniLink 5000 tonnage monitor module:
Turn the RUN/PROG keyed selector switch to the RUN position and make single strokes of the
machine. The display will update the channel and total tonnage display each stroke. Between
strokes, switch the RUN/PROG keyed selector switch to the PROG position and enter cal. #s for
both channels until channel 1 and channel 2 tonnages of the OmniLink 5000 tonnage monitor
module are within one or two percent of one-half (1/2) the sum of the load cell readings.
For a four channel OmniLink 5000 tonnage monitor module:
Turn the RUN/PROG keyed selector switch to the RUN position and make single strokes of the
machine. The display will update the channel and total tonnage display each stroke. Between
strokes, switch the RUN/PROG keyed selector switch to the PROG position and enter cal. #s for
all channels until all four channel tonnages of the OmniLink 5000 tonnage monitor module are
within one or two percent of one-fourth (1/4) the sum of the load cell readings
m) Retain the calibration numbers so that periodic checks for calibration can be made. It is suggested
that a copy of these numbers be retained inside the control enclosure and that a second copy be kept
in files.
n) Reduce the load gradually, and verify that the tonnages displayed by the OmniLink 5000 tonnage
monitor module "track" within one or two percent of those of displayed on the load cells. Failure of
this indicates a non-linearity which could be due to incorrect strain gauge location, improper strain
gauge mounting, or incorrect tie rod tension (in frames of this construction).
o) Press the EXIT softkey and return to the Tonnage Monitor menu.
p) Remove the load cells and associated "stack" elements from the machine.
Calibration is complete.