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M3LM OPERATING MANUAL EM-2663-B Rev.4
11. CHECKING, MAINTENANCE
11.1 CHECKING
(1) Terminal wiring: Check that all cables are correctly connected according to the connection diagram.
(2) DIP SW setting: Check that the switches are set to appropriate positions.
(3) Power input voltage: Check voltage across the terminal 11 – 12 with a multimeter.
(4) Input: Check that the input signal is within 0 – 100% of full-scale.
If the potentiometer or its extension wires are broken, the output goes over 100% (below 0% with downscale protection)
due to burnout function. Confirm the status indicator LED pattern and check leadwires in such a case.
(5) Output: Check that the load resistance meets the described specifications.
11.2 MAINTENANCE
Perform the periodic calibration as stated below.
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CALIBRATION
Warm up the unit for 10 minutes or more, apply 0, 25, 50, 75 and 100% input to the unit, and make sure that the output
is 0, 25, 50, 75 and 100% respectively within the prescribed accuracy. In case the output is deviated from the accuracy,
perform the fine zero/span adjustment.
