Humidity Operate the inverter within the ambient air humidity of usually up to 95% with circuit board coating. Too high humidity will pose breakdown. The humidity conditions for the insulation distance defined in JEM 1103 standard "Insulation Distance from Control problems of reduced insulation and metal corrosion. On the other hand, too low humidity may cause a spatial electrical Equipment" is 45 to 85%. Measures against high humidity • Provide dry air into the enclosure from outside. • Make the enclosure enclosed, and provide it with a hygroscopic agent. • Provide a space heater in the enclosure.
Measures against low humidity your body (static electricity) beforehand, and keep your body away from the parts and patterns. Air with proper humidity can be blown into the enclosure from outside. Also, when installing or inspecting the unit, discharge Measures against condensation Condensation may occur if frequent operation stops change the in-enclosure temperature suddenly or if the outside air temperature changes suddenly. Condensation causes such faults as reduced insulation and corrosion. • Take the measures against high humidity. • Do not power OFF the inverter.
(Keep the start signal of the inverter OFF.) Dust, dirt, oil mist Dust and dirt will cause such faults as poor contacts, reduced insulation and cooling effect due to the moisture-absorbed accumulated dust and dirt, and in-enclosure temperature rise due to a clogged filter. In an atmosphere where conductive powder floats, dust and dirt will cause such faults as malfunction, deteriorated insulation and short circuit in a short time. Since oil mist will cause similar conditions, it is necessary to take adequate measures. Countermeasure • Place the inverter in a totally enclosed enclosure. Take measures if the in-enclosure temperature rises. (Refer to page 26 .) • Purge air.
Corrosive gas, salt damage Pump clean air from outside to make the in-enclosure air pressure higher than the outside air pressure. If the inverter is exposed to corrosive gas or to salt near a beach, the printed board patterns and parts will corrode or the relays and switches will result in poor contact. In such places, take the measures given in the previous paragraph. Explosive, flammable gases caused by explosive gas, dust or dirt, an enclosure cannot be used unless it structurally complies with the guidelines and has As the inverter is non-explosion proof, it must be contained in an explosion-proof enclosure. In places where explosion may be passed the specified tests.
This makes the enclosure itself expensive (including the test charges). The best way is to avoid installation in such places and install the inverter in a non-hazardous place. High altitude Use the inverter at an altitude of within 2500 m. For use at an altitude above 1000 m, consider a 3% reduction in the rated current per 500 m increase in altitude. If it is used at a higher place, it is likely that thin air will reduce the cooling effect and low air pressure will deteriorate dielectric strength. Vibration, impact Y, Z axes.
Applying vibration and impacts for a long time may loosen the structures and cause poor contacts of connectors, The vibration resistance of the inverter is up to 5.9 m/s 2 at 10 to 55 Hz frequency and 1 mm amplitude for the directions of X, even if those vibration and impacts are within the specified values. Especially when impacts are applied repeatedly, caution must be taken because such impacts may break the installation feet. 24 2. INSTALLATION AND WIRING 2.3 Installation of the inverter and enclosure design