Mitsubishi Electric MEsoftstart/I01 Users, Installation & Instruction Manual page 25

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Dust, dirt, oil mist
Dust and dirt may cause such faults as poor contacts, reduced insulation and cooling effect due to the moisture-absorbed
accumulated dust and dirt and in-cabinet temperature rise due to a clogged filter. In an atmosphere where conductive powder
floats, dust and dirt may cause such faults as malfunction, deteriorated insulation and short circuit in a short time.
Since oil mist may cause similar conditions, it is necessary to take adequate measures.
Countermeasures:
Place the soft starter in a totally enclosed cabinet.
o
Take measures if the in-cabinet temperature rises. (Refer to paragraph 2.2.2.1)
o
Purge air.
o
Pump clean air from outside to make the in-cabinet air pressure higher than the outside air pressure.
o
Corrosive gas, salt damage
If the soft starter is exposed to corrosive gas or to salt (e.g. near the sea), the printed circuit board and components will corrode,
the relays and switches can deteriorate resulting in unreliable contact.
When it is required to operate the soft starter in this environment, take the measures suggested in the paragraph 2.2.2.3.
Explosive, flammable gases
It is not recommended to install and use the soft starter in an environment where flammable gasses are present. The soft starter
is not explosion proof and it will have to be contained in a certified explosion-proof cabinet If possible, avoid installation in such
environments and install the soft starter in a non-hazardous place.
High altitude
The soft starter may be used at its recommended current rating, at altitudes lower than 1400m above sea-level. For the
installation at an altitude above 1400 m, de-rate the rated current of the soft starter at 0.67% per 100 m.
If it is used at a higher altitude than 2500m above sea level, thin air will reduce the cooling effect and low air pressure will
deteriorate dielectric strength and a higher rated soft starter model should be selected.
Vibration, impact
The soft starter is not designed to withstand periods of high vibration or high impact. The vibration resistance of the soft starter
vibration spectrum is tested at 0.02g²/Hz from 10 to 50Hz, reducing linearly on a log-linear plot to 0.0001g²/Hz at 500Hz for
the directions of X, Y, Z axes. Applying vibration and impacts for a long time may loosen the structures and cause poor contacts
of connectors, even if those vibration and impacts are within the specified values. (Refer to IEC 60068-2-6).
Especially when impacts are applied repeatedly, caution must be taken because such impacts may break the installation feet.
Countermeasures:
Provide the cabinet with rubber vibration isolators.
o
Strengthen the structure to prevent the cabinet from resonance.
o
Install the cabinet away from the sources of the vibration.
o
25 Installation Instructions

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