MITSUBISHI ELECTRIC Mitsubishi Programmable Logic Controller QD75D - Manual (Page 79)

4 - 7
MELSEC-Q
4 INSTALLATION, WIRING AND MAINTENANCE OF THE PRODUCT
4.2 Installation
4.2.1 Precautions for installation
The precautions for installing the QD75 are given below. Refer to this section as well
as "4.1.3 Handling precautions" when carrying out the work.
Precautions for installation
!
DANGER
Completely turn off the externally supplied power used in the system before cleaning or
tightening the screws.
Failure to turn all phases OFF could lead to electric shocks.
! CAUTION
Never disassemble or modify the module.
Failure to observe this could lead to trouble, malfunctioning, injuries or fires.
Completely turn off the externally supplied power used in the system before installing or
removing the module.
Failure to turn all phases OFF could lead to module trouble or malfunctioning.
Do not mount/remove the module onto/from base unit more than 50 times (IEC61131-2-
compliant), after the first use of the product. Failure to do so may cause the module to
malfunction due to poor contact of connector.
Use the PLC within the general specifications environment given in this manual.
Using the PLC outside the general specification range environment could lead to electric
shocks, fires, malfunctioning, product damage or deterioration.
Hold down the module mounting lever at the bottom of the module and securely insert the
module fixing projection into the fixing holes of the base module. Improper mounting of the
module may lead to malfunctioning, faults, or dropping.
When using the module in the environment subject to much vibration, secure the module with a
screw.
Tighten the screw within the range of the specified tightening torque.
Insufficient tightening may lead to dropping, short-circuit, or malfunctioning.
Excessive tightening may damage the screw or module, leading to dropping, short-circuit, or
malfunctioning .