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CHAPTER 4 SETTINGS AND PROCEDURE
BEFORE OPERATION
This chapter describes the procedure prior to operation, part names, zero/gain adjustment, and wiring method of the
QD73A1.
4.1 Handling Precautions
This section describes the handling precautions for the QD73A1.
• Do not disassemble the module. Doing so may cause failure, malfunction, injury, or a fire.
• Shut off the external power supply (all phases) used in the system before mounting or removing the module.
Failure to do so may cause the module to fail or malfunction.
• After the first use of the product, do not mount/remove the module to/from the base unit, and the terminal
block to/from the module more than 50 times (IEC 61131-2 compliant) respectively.
Exceeding the limit may cause malfunction.
• Use the programmable controller in an environment that meets the general specifications in the user's
manual for the CPU module used.
Failure to do so may result in electric shock, fire, malfunction, or damage to or deterioration of the product.
• To mount the module, while pressing the module mounting lever located in the lower part of the module, fully
insert the module fixing projection(s) into the hole(s) in the base unit and press the module until it snaps into
place.
Incorrect mounting may cause malfunction, failure or drop of the module.
When using the programmable controller in an environment of frequent vibrations, fix the module with a
screw.
• Tighten the screws such as a module fixing screw within the specified torque range.
Undertightening can cause drop of the screw, short circuit or malfunction.
Overtightening can damage the screw and/or module, resulting in drop, short circuit, or malfunction.
*1 The module can be easily fixed onto the base unit using the hook at the top of the module.
However, it is recommended to secure the module with the module fixing screw if the module is subject to significant
vibration.
• Do not directly touch any conductive parts and electronic components of the module.
Doing so can cause malfunction or failure of the module.
• Prevent foreign matter such as dust or wire chips from entering the module. Such foreign matter can cause a
fire, failure, or malfunction.
• Do not drop the module case, or do not subject it to strong impact.
• Lock the control panel so that only specialists educated in electric installation can open it.
Screw Tightening torque range
Module fixing screw (M3 screw)
*1
0.36 to 0.48N • m
Connector screw (M2.6 screw) 0.20 to 0.29N • m