Magnetek IMPULSE VG+ Series 3, Instruction Manual, Page: 90 / 183

IMPULSE•VG+ Series 3 Instruction Manual – 07/25/05
5-37
Setting up an External Display Device
NOTE: This procedure assumes that the System Tare and Calibration procedure has been
completed. The setup of parameter C10-03 and C10-07 should be returned to the
factory default settings for this procedure or may be skipped entirely if the displayed
weight does not need to be read on the keypad of the hoist drive. C10-03 and C10-07
= 0. The external display device should be configured to accept a 0 - 10VDC input
where 0 V = no load and 10V - Full load or 125% load. (This may be site specific.)
1. Program the desired analog output terminal (FM or AM) for ‘Load Weight’
Example: H4-01 = 29 (Terminal FM) or H4-04 = 29 (Terminal AM).
2. Remove the load from the bottom block. If there is a spreader beam or other lifting device that is
constantly attached to the bottom block, it may be left in place. If the lifting device changes, it
should be removed for this procedure and the weight of the lifting device used for each lift
should be manually subtracted from weight that is calculated by the drive.
3. Lift no-load and monitor the ‘Weight Measurement’ on U1-29 on the keypad. The keypad
digital display should read 0; however, if it does not, lower C10-06 until the keypad digital
display reads zero. Re-test as necessary to get as close to 0 as possible.
4. After lifting no-load again, read the weight displayed on the display device. If the displayed
weight is greater than 0, begin to add a negative bias to terminal FM by adjusting H4-03 down
from 0.00. It will be in -xx.x format. To switch from a positive bias to a negative bias, move the
cursor to the far left digit and press the up arrow key, which will display the - sign. As the
negative bias is increased, the weight displayed on the digital display device will decrease.
Continue to add negative bias until the weight deployed on the digital display device reads as
closed to 0 as possible without going negative.
5. Pick up a known load of approximately 50% or greater and read the weight displayed on the
display device. If the indicated weight does not match the actual weight, adjust H4-02 or H4-05
(Terminal FM or AM Gain) to obtain the required reading. H4-02 and H4-05 are gain multiplier
parameters for the respective analog output and will raise or lower the 0-10V dc signal to the
display device.
6. Re-test with no load. If the weight displayed on the display device does not equal zero, re-adjust
the negative bias at H4-03.
7. This procedure may be repeated as many times as necessary until the correct combination of
gain and bias is found to make the system within tolerance at the high and low end of maximum
capacity of the hoist.