Pressroom Electronics PressCam 8, Installation And Operation Manual, Page: 49 / 56

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Calibrating the TLM Load Module
*If you have a Maximizer Load Monitor (Allen Bradley
based system), please refer to that manual for proper
calibration of the TLM .
Step 1: Now that you have found the best possible
sensor location, torque all of the sensors
down to 150 in/lbs on the sensor bolts. Do
not put the sensor enclosure covers on yet.
You will need to test each sensor location.
Step 2: Flip mode select switches to:
Perform the steps found on the “Tonnage
Setup” page of this manual to connect the
TLM to the Presscam 8, and configure
machine capacity.
Step 3: On the Presscam 8 Tonnage setup screen,
set the Low limit of each channel to 1 and
the High limit to the maximum limit for each
leg. Now you can watch the COUNTS column
on the screen and adjust the zero pot on the
TLM for ~0 counts.
NOTE: The Presscam 8 can only read positive
voltages, to avoid damage check to make
sure voltages going to the Presscam are
positive)
Step 4: Again connect your volt meter to the output
plug on channel one and common. Have
someone put pressure on channel one’s
sensor with their thumb. It should slightly
change as pressure is applied. This will verify
your sensor location. Normally we locate our
sensors:
Ch1 = Left Rear Ch3 = Left Front
Ch2 = Right Rear Ch4 = Right Front
Step 5: Coat the sensors with silicone if you are
calibrating a forging press. This will help
prevent water damage when the presses are
washed. Put the sensor enclosure covers on
each box.
Step 6: Without load cells in the press, cycle the
press and stop it at bottom dead center.
Measure between the ram and the bed to
determine the size of the spacers you will
need. Be careful to allow around a 1/8 inch
gap between the ram and the load cells.
* Damage to the press could occur if the ram
locks up the load cells due to an improper
measurement.
Step 7: Cycle the press so the ram goes to the top.
Insert the load cells and spacers. Keep the
load cells symmetrical with each other in the
bed of the press. Record their placement on
a calibration sheet.
Step 8: Cycle the press over and over. Each
time lower the adjustment until you reach
the tonnage rating of the press.
* The load will increase approximately 1 ton
for every 1/1000 inch as you begin to lower
the adjustment.
Step 9: Once you have evened out load distribution
(using shims) at the press capacity, you are
ready to adjust the gain pots on the TLM. Turn
the mode selector switches to:
Figure 8
Switches and controls used to calibrate
the TLM Load Module.
Tonnage Load Monitor
(optional)
Calibration