Tinius Olsen MP1200 - 7.3 DC MOTOR CALIBRATION

Tinius Olsen MP1200 Extrusion Plastometer Page 7-2
Operation Manual # 02002215
7.2.3 Verify WLD Motor Controller pot settings.
7.3 DC MOTOR CALIBRATION
7.3.1 After power up, the MP1200 will always prompt the user to send the WLD (no matter
where it currently is) to its HOME position. This allows the WLD to find the upper
sensor (proximity switch) which it uses for reference. One the home position is
located, the WLD will run up and turn out of the way and come to rest at its READY
position.
7.3.2 Verify the following values (change as required) and press ENTER to continue:
DAC = 32767 (cts for 0 V dc output) Upper Tvl = approximately 24 mm
Full Speed = 100% . Lower Tvl = approximately 212 mm
Slow Speed = 40%........................................Height Scale Factor = 1814.173 cts/mm
Minimum Output = 06%.................................Height Offset = approximately 205 mm
Accel/Decel = 300 counts
7.3.3 Upper Travel - The Upper Travel setting determines how far the weight platform
rotates. The Slow Speed setting is used for the upper swing-away region of the
travel.
7.3.4 Lower Travel – The Lower Travel setting determines how far below the proximity
switch the WLD can run. Do not set this too high or the WLD will go too far and
bottom out. If the value is too small it may not run far enough. The Fast speed
setting is used here.
7.3.5 The Height Offset relates the WLD height display to the actual position of the
platform relative to the top of the die. When the WLD is all the way down, the WLD
display reading is the Lower Travel value subtracted from the Height Offset. So
using the default values above, when the WLD is all the way down the WLD height
display will be 205-212 mm=-7 mm. The Height Offset may be tweaked as needed to
make the WLD display reading as close to the PPDT reading as possible.
7.3.6 Min speed is the smallest value to make the motor run without stalling.
7.3.7 The MP1200M has an Accel/Decel value in terms of counts to quickly ramp up/down
the speed but prevent instant full speed starting. This may mean a very small
overshoot when stopping.