Cleveland Motion Controls DIN Rail Amplifier MWI-13262 Ultra Series Non-Isolated REV BA - Manual (Page 22)

DIN R AIL A MPLIFIER , MWI-13262 U LTRA S ERIES MAN-13262 U LTRA R EV BA
3.6 A DJUSTING A MPLIFIER C OURSE Z ERO
Two individual coarse offset adjustments have been provided. There is an adjustment for each Instrumentation
Amplifier channel because each transducer can have unique offset voltages. Keep in mind that the Coarse Zero
adjustments are usually only adjusted one time, typically when the amplifier is installed, or transducers are replaced.
1. Ensure that the IA gain settings have been set as described in section 2.5.
2. Set the Zero pot on the front cover to mid-way (approximately 9 turns from either clutch actuation).
3. Set the Gain POT from fully counter clockwise.
4. Temporarily place jumper switch J8 to the (2-3) position. This position excludes the RCH signal from
contributing to the analog outputs so that only the LCH zero is represented on the analog output.
5. Connect a DC Voltmeter to inspect the +/- 10 VDC output signal for the “Zero”
condition (NO calibration force on the transducers ).
6. Adjust the LCH coarse POT (P5) to achieve the desired “Zero” voltage. As this is a coarse adjustment, a
voltage within 50 millivolts of the intended “Zero” should be adequate.
7. Return jumper-switch J8 to the (1-2) position for normal operation (where the sum of both channels is
reported on the analog outputs).
8. Adjust the RCH offset using the RCH Coarse Zero POT (P3).
3.7 A
DJUSTING
T
HE
LCH-RCH B
ALANCE
This adjustment has been factory set for a “50/50” balance between channels. We recommend that you only adjust
the LCH-RCH balance if it is necessary to better match the signals from transducers having substantially different
output signals. To discourage unintended adjustment, the Balance POT is located behind the access cover and is
recessed slightly behind the LCH and RCH offset POTS, requiring a more deliberate placement of the adjustment
tool.
Turning the Balance POT clockwise, will boost the signal for the LCH and reduce the signal for the RCH. Because
of this, we recommend that you make any needed balance adjustments early in the calibration cycle. Adjust the
Balance POT by observing the affect of an unequal application of calibration force upon the analog outputs. When
adjusted correctly, the measured force reported by the analog outputs should be insensitive to the non-equal sharing
of force between transducers.
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