MITSUBISHI ELECTRIC FR-S520 - Manual (Page 183)

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(3) Installation
Avoid hostile environment where oil mist, fluff, dust etc. are floating, and install
the inverter in a clean place or put it within an enclosed box where floating
bodies will not enter. When placing the inverter inside a box, determine the
cooling system and box dimensions so that the ambient temperature of the
inverter will fall within the permissible temperature range (refer to page 166 for
the specified value).
The inverter may become hot locally, so do not mount it to combustible material
such as wood.
Mount the inverter to a wall in a vertical direction.
(4) Setting
By setting the operation panel, the inverter can be run at the speed as high as
120Hz. Therefore, wrong setting will lead to hazardous conditions. Using the
maximum frequency setting function, set the upper limit.
(The maximum frequency in the external operation mode is factory-set to
60Hz.)
Setting the DC injection brake operation voltage and operation time to values
higher than the factory settings can cause the motor to overheat (electronic
overcurrent protection trip).
(5) Power supply
When the inverter is installed near a large-capacity power transformer (500kVA
or more at the wiring length of 10m (32.81feet) or less) or the power capacitor is
to be switched, an excessive peak current will flow in the power supply input
circuit, damaging the inverter. In such a case, always install the FR-BEL or FR-
BAL power factor improving reactor.
1500
1000
500
0
Wiring length (m (feet))
10 (32.81)
Power supply
equipment
capacity (kVA)
Power factor
improving reactor
installation range
If a surge voltage occurs in the power supply system, this surge energy may
flow into the inverter, causing the inverter to display OV1, OV2 or OV3 and
come to an alarm stop. In such a case, also install the FR-BEL or FR-BAL
power factor improving reactor.