Toshiba LC531 Series Instruction Manual page 11

Important Notes on Handling and Operation
Be sure to strictly observe the precautions given herein to maintain the performance and
functions of LC531/LC532 single-loop controller of the Toshiba Unified Controller nv Series,
and use it safely over a long period of time to come.
• Toshiba is not liable to any responsibility whatsoever for any inconveniences arising from
using the product contrary to the precautions specified in this manual or to the procedures
for installation and operation specified in laws and ordinances.
• Important points in general
• Place of installation
Secure enough space for maintenance in installing the product. An improper posture during maintenance work
could cause human injuries and technical errors.
• Input power
The rated source voltages are 24 VDC +10%/-15%. (See the unit specifications.)
Voltages higher than above, if applied, could cause damage to the product.
Exercise care to prevent connection of wires of higher voltages to the power input terminal board and to be sure of
the polarities in wiring it. A power input voltage outside the specified range will cause malfunctions and inaccuracy.
• Input signals
Do not apply voltages outside the specified range to the signal input terminals. Do not apply external voltages to
the output terminals. This is important to protect the product from ill effects on its characteristics and from damage.
• Cleaning
To clean the panel, wipe it with tissue paper or a soft cloth dipped in lukewarm water. Do not use organic solvents
or chemicals because such substances could cause discoloration.
• Dielectric test
Observe the following in making a dielectric test on the product.
Apply the AC voltage (500 VAC) between the power terminal and grounding terminal on the terminal board and
check that nothing abnormal occurs.
Before conducting a dielectric test, disconnect the power wires and input/output signal wires to protect the product
from damage due to test voltage leakage and technical errors.
The test voltages are much higher than the rated voltages. Therefore, dielectric tests should be limited to a
minimum.
• Prohibition of modifying or disassembling the product
If the product needs repairs, contact our nearest service representative.
Do not modify or disassemble the product.
Normal operation cannot be guaranteed if the product is modified or disassembled. Never modify or disassemble
the product because it could cause electric shock, malfunctions, and/or failures.
• Recommended parts replacement
The service life of the product is approximately 10 years (varying depending on the conditions of use).
To maintain reliable performance during its service life, it is recommended that the aluminum electrolytic capacitor
(together with the power board) be replaced with a new one.
The board inside the product employs the aluminum electrolytic capacitor, which is an expendable part and whose
service life varies greatly with the ambient temperature. It lasts about 10 years at an instrument ambient
temperature of 35C. The service life of the capacitor decreases by about one half as ambient temperature
increases 10C.
Unified Controller nv Series Single-Loop Controller LC531/LC532 Instruction Manual
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