Filter
Top Products
7
1
OUTLINE
Installation of the drive unit and enclosure design
1.4 Installation of the drive unit and enclosure design
When a drive unit enclosure 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 enclosure structure, size and
equipment layout. The drive unit uses many semiconductor devices. To ensure higher reliability and long period of operation,
operate the drive unit in the ambient environment that completely satisfies the equipment specifications.
1.4.1 Drive unit installation environment
As the drive unit installation environment should satisfy 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 drive unit, but also
causes a failure. Refer to the following points and take adequate measures.
(1) Temperature
The permissible surrounding air temperature of the drive unit is between -10 and +50°C. Always operate the drive unit 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 surrounding air temperature of the drive unit falls within the
specified range.
1) Measures against high temperature
Use a forced ventilation system or similar cooling system. (Refer to page 9)
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 enclosure.
Do not power OFF the drive unit. (Keep the start signal of the drive unit OFF.)
3) Sudden temperature changes
Select an installation place where temperature does not change suddenly.
Avoid installing the drive unit near the air outlet of an air conditioner.
If temperature changes are caused by opening/closing of a door, install the drive unit away from the door.
(2) Humidity
Normally operate the drive unit 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 enclosure from outside.
Provide a space heater in the enclosure.
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 drive unit. (Keep the start signal of the drive unit OFF.)
Environmental standard specifications of drive unit
Item Description
Surrounding air
temperature
-10 to +50°C (non-freezing)
Ambient humidity 90%RH or less (non-condensing)
Atmosphere Indoors (free from corrosive gas, flammable gas, oil mist, dust and dirt)
Maximum altitude 1,000m or less
Vibration
5.9m/s
2
or less at 10 to 55Hz (directions of X, Y, Z axes)