20 Digital Multicircuit Protector S8M
Safety Precautions
!CAUTION
■ Precautions for Safe Use
Mounting
Take adequate measures to ensure proper heat dissipation to
increase the long-term reliability of the S8M. Install the S8M so that
the air flow circulates around it, because the S8M is designed to
radiate heat by means of natural air flow.
Improper mounting will interfere with heat dissipation and may
occasionally result in deterioration or damage of internal parts. Do
not use any mounting method other than a standard one.
Side-by-side mounting of two or more S8M is possible. The switch
mode power supply connected to inputs and any other sources of
heat, however, must be separated as shown below.
Wiring
Minor electric shock during operation may occasionally occur.
Always attach the terminal cover when using the S8M.
Minor fire may possibly occur. Ensure that input and output terminals
are wired correctly.
Increases in the temperature of internal parts resulting from heating
of wiring materials may result in deterioration or damage to internal
parts. Use wiring materials suitable to the current being used. The
following wiring materials, torque and strip length are recommended
to prevent heating and possible fires in wiring materials.
Recommended Wire Types
Do not apply more than 100 N force to the terminal block when
tightening screws.
Be sure to remove the sheet covering the S8M for machining before
power-ON so that it does not interfere with heat dissipation.
Installation Environment
Do not use the S8M in locations subject to shocks or vibrations. In
particular, install the S8M as far away as possible from contactors or
other devices that are vibration sources. Additionally, install a PFP-M
End Plate on each end of the S8M.
Install the S8M well away from any sources of strong, high frequency
noise and surge.
Operating Life
The life of the S8M is determined by the life of the electrolytic
capacitors used inside. Here, Arrhenius Law applies, i.e., the life will
be halved for each rise of 10
°C or the life will be doubled for each
drop of 10
°C. The life of the S8M can thus be increased by reducing
its internal temperature.
Ambient Operating and Storage
Environment
Store the S8M at a temperature of −25 to 65°C and a humidity of
25% to 90%.
Internal parts may occasionally be deteriorated or damaged. Do not
use the S8M in areas outside the derating curve (i.e., in the area
shown by shading ( ) in the derating curve diagram on
page 6).
Surrounding air temperature for UL 508 Listing and UL60950-1
Recognition is 50
°C.
Use the S8M at a humidity of 25% to 85%.
Do not use the S8M in locations subject to direct sunlight.
Do not use the S8M in locations where liquid, foreign matter, or
corrosive gases may enter the S8M.
Minor electric shock, fire, or Product failure may
occasionally occur. Do not disassemble, modify, or repair
the Product or touch interior of the Product.
Minor burns may occasionally occur. Do not touch the
Product while power is being supplied or immediately
after power is turned OFF.
Fire may occasionally occur. Tighten terminal screws to
the specified torque.
Power input terminals: M4 1.08 N·m (9.6 in. lb.)
Branch output terminals: M3.5 0.8 to 1.0 N·m
(7.2 to 8.8 in. lb.)
Minor electric shock, fire, or Product failure may
occasionally occur. Do not allow any pieces of metal or
conductors or any clippings or cuttings resulting from
installation work to enter the Product.
The Product will be damaged. Do not incorrectly connect
the polarity of power input terminals.
(See note 1.)
(See note 2.)
(See note 3.)
(See note 1.)
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