Precautions For Using Inverters; Precautions In Introducing Inverters - Fuji Electric FRENIC-HVAC User Manual

2.8 Precautions for Using Inverters

2.8.1

Precautions in introducing inverters

This section provides precautions in introducing inverters, e.g. precautions for installation
environment, power supply lines, wiring, and connection to peripheral equipment. Be sure to observe
those precautions.
 Installation environment
Install the inverter in an environment that satisfies the requirements listed in Table 2.4 in Section 2.7.1.
Fuji Electric strongly recommends installing inverters in a panel for safety reasons, in particular, when
installing the ones whose enclosure rating is UL open type.
When installing the inverter in a place out of the specified environmental requirements, it is necessary
to derate the inverter or consider the panel engineering suitable for the special environment or the
panel installation location.
The special environments listed below require using the specially designed panel or considering the
panel installation location
Unusual
environments
Highly concentrated
sulfidizing gas or
other corrosive gases
A lot of conductive
dust or foreign
material (e.g., metal
powders or shavings,
carbon fibers, or
carbon dust)
A lot of fibrous or
paper dust
High humidity or
dew condensation
Vibration or shock
exceeding the
specified level
Possible problems
Corrosive gases cause parts
inside the inverter to
corrode, resulting in an
inverter malfunction.
Entry of conductive dust
into the inverter causes a
short circuit.
Fibrous or paper dust
accumulated on the heat
sink lowers the cooing
effect.
Entry of dust into the
inverter causes the
electronic circuitry to
malfunction.
In an environment where a
humidifier is used or where
the air conditioner is not
equipped with a
dehumidifier, high
humidity or dew
condensation results, which
causes a short-circuiting or
malfunction of electronic
circuitry inside the inverter.
If a large vibration or shock
exceeding the specified
level is applied to the
inverter, for example, due to
a carrier running on seam
joints of rails or blasting at a
construction site, the
inverter structure gets
damaged.
2-46
Sample measures
Any of the following measures may be
necessary.
- Mount the inverter in a sealed panel with
IP6X or air-purge mechanism.
- Place the panel in a room free from
influence of the gases.
Any of the following measures may be
necessary.
- Mount the inverter in a sealed panel.
- Place the panel in a room free from
influence of the conductive dust.
Any of the following measures may be
necessary.
- Mount the inverter in a sealed panel that
shuts out dust.
- Ensure a maintenance space for
periodical cleaning of the heat sink in
panel engineering design.
- Employ external cooling when mounting
the inverter in a panel for easy
maintenance and perform periodical
maintenance.
- Put a heating module such as a space
heater in the panel.
- Insert shock-absorbing materials
between the mounting base of the
inverter and the panel for safe mounting.
Remarks