IOEM/REM Safey and Installation Guide
66
IOEM/REM Safey and Installation Guide
67
•
Signal line suppressors should consist of a three-element gas tube followed
by metal oxide varistors and suppressor diodes.
•
The protective elements should be matched such that high-energy surge
voltages trigger the gas surge arrester, while low energy or surge voltages
affect the MOV’s and suppressor diodes.
•
Lightning protection devices should be located as close to the IOEM and
REM as possible and wired in accordance with the
National Electric Code
in approved watertight enclosures.
CAUTION: This or any other installation procedure cannot protect against a
direct lightning strike. YSI Incorporated cannot accept liability for damage
due to lightning or secondary surges.
Sealants, Desiccants, and Securing IOEM and REM
Environmental conditions can promote the formation of condensation in and around
the IOEM and REM. It is very important to follow the steps below to prevent damage
to the electronic components and to extend the life of the IOEM and REM system.
1.
Place solid rubber grommets in bulkhead fittings that have no electrical
connections.
2.
If using optional conduit fittings (YSI p/n 065926UL) in place of bulkhead
fittings, industrial encapsulant (YSI p/n 065921 conduit sealer) must be
used to prevent moisture from entering the IOEM and REM enclosure.
Apply the sealant after all wiring and connections are complete. Failure
to use industrial encapsulant may result in damage to the IOEM and REM.
3.
Desiccant pack must be replaced whenever the IOEM and REM enclosure
is opened (Desiccant pack, YSI p/n 006506). Desiccant absorbs moisture
captured within the enclosure.
4.
Ensure that the rubber gasket is seated between front panel and enclosure
whenever enclosure is closed.
5.
Replace the front panel ensuring that the ribbon cable is not trapped in
the gasket channel before inserting mounting screws.
6.
Tighten mounting screws, making sure not to cross thread. The screws are
stainless steel and the receiving threads are brass. Do not over-tighten!
CAUTION: The IOEM and REM utilizes sensitive solid state devices that can
be damaged by static shock. Installers must observe accepted ESD (Electro-
Static Discharge) procedures while connecting wires to the IOEM and REM
control board.
Installation and Wiring
ATTENTION : les modèles d’IOEM (module d’expansion d’entré et de sortie)
et de REM (module d’expansion de relais) utilisent des appareils transistorisés
sensibles pouvant être endommagés par des décharges d’électricité statique.
Les installateurs doivent observer les procédures de protection acceptées contre
les décharges électrostatiques lors du câblage à la carte de l’IOEM et du REM.
Installation and Wiring
