Panel Design; Inverter Installation Environment - Mitsubishi Electric F700 Instruction Manual

Panel design

2.1 Panel design
When an inverter panel is to be designed and manufactured, heat generated by contained equipment, etc., the
environment of an operating place, and others must be fully considered to determine the panel structure, size and
equipment layout. The inverter unit uses many semiconductor devices. To ensure higher reliability and long period
of operation, operate the inverter in the ambient environment that completely satisfies the equipment specifications.
2.1.1

Inverter installation environment

As the inverter installation enviromnet should satisfiy the standard specifications indicated in the following table,
operation in any place that does not meet these conditions not only deteriorates the performance and life of the
inverter, but also causes a failure. Refer to the following points and take adequate measures.
Environmental standard specifications of inverter
Item
Ambient temperature
Ambient humidity
Atmosphere
Maximum Altitude
Vibration
(1) Temperature
The permissible ambient temperature of the inverter is between -10 and +50°C. Always operate the inverter within
this temperature range. Operation outside this range will considerably shorten the service lives of the
semiconductors, parts, capacitors and others. Take the following measures so that the ambient temperature of the
inverter falls within the specified range.
1) Measures against high temperature
• Use a forced ventilation system or similar cooling system. (Refer to page 26.)
• Install the panel in an air-conditioned electrical chamber.
• Block direct sunlight.
• Provide a shield or similar plate to avoid direct exposure to the radiated heat and wind of a heat source.
• Ventilate the area around the panel well.
2) Measures against low temperature
• Provide a space heater in the panel.
• Do not power off the inverter. (Keep the start signal of the inverter off.)
3) Sudden temperature changes
• Select an installation place where temperature does not change suddenly.
• Avoid installing the inverter near the air outlet of an air conditioner.
• If temperature changes are caused by opening/closing of a door, install the inverter away from the door.
(2) Humidity
Normally operate the inverter within the 45 to 90% range of the ambient humidity. Too high humidity will pose
problems of reduced insulation and metal corrosion. On the other hand, too low humidity may produce a spatial
electrical breakdown. The insulation distance specified in JEM1103 "Control Equipment Insulator" is defined as
humidity 45 to 85%.
1) Measures against high humidity
• Make the panel enclosed, and provide it with a hygroscopic agent.
• Take dry air into the panel from outside.
• Provide a space heater in the panel.
2) Measures against low humidity
What is important in fitting or inspection of the unit in this status is to discharge your body (static electricity)
beforehand and keep your body from contact with the parts and patterns, besides blowing air of proper humidity
into the panel from outside.
3) Measures against condensation
Condensation may occur if frequent operation stops change the in-panel 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 in 1).
• Do not power off the inverter. (Keep the start signal of the inverter off.)
24
Description
-10 to +50°C (non-freezing)
90% RH maximum (non-condensing)
Free from corrosive and explosive gases, dust and dirt
1,000m or less
2
5.9m/s or less (JIS C 0040 compliant)