Checking, Maintenance, Initialization Of Parameters; Checking; Maintenance; Initialization Of Parameters - M-system M3LU2 Operating Manual

11. CHECKING, MAINTENANCE, INITIALIZATION OF PARAMETERs

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 10 – 12 (AC) or 11 – 12 (DC) with a multimeter.
(4) Input: Check that the input signal is within 0 to 100% of full-scale.
If the DC voltage (mV), thermocouple, RTD, resistance, potentiometer input or their extension wires is/are discon-
nected, 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.
■ 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.

11.3 INITIALIZATION OF PARAMETERs

You can reset the DIP-SW-configured parameters (I/O ranging and fine adjustments) to the default status. Reset the pa-
rameters in the following procedure.
(1) Turn off the power supply to the unit, open the housing cover and set the SW2-1 to OFF and SW2-2 to ON position.
(2) Close the cover and turn on the power while pressing MODE button.
(3) Wait until green LED blinks at the LD1, LD2 and LD3.
(4) Turn off the power, open the cover and reset the SW2-1 and SW2-2 to the previous position.
(5) Close the cover and turn on the power again.
M3LU2 OPERATING MANUAL EM-2653-B Rev.0 39