iv
Environ-
mental
conditions
Installation
location
Use the inverter within the ambient temperature range from -10 to +50°C.
The heat sink and braking resistor of the inverter may become hot under
certain operating conditions, so install the inverter on nonflammable
material such as metal.
Ensure that the installation location meets the environmental conditions
specified in Chapter 8, Section 8.4 "Operating Environment and Storage
Environment."
Installing an
MCCB or
RCD/ELCB
Install a recommended molded case circuit breaker (MCCB) or
residual-current-operated protective device (RCD)/earth leakage circuit
breaker (ELCB) (with overcurrent protection) in the primary circuit of each
inverter to protect the wiring. Ensure that the circuit breaker capacity is
equivalent to or lower than the recommended capacity.
Installing an MC
in the secondary
circuit
If a magnetic contactor (MC) is installed in the inverter's output (secondary)
circuit for switching the motor to commercial power or for any other
purpose, ensure that both the inverter and the motor are completely stopped
before you turn the MC on or off.
Remove a surge killer integrated with the magnetic contactor in the
inverter's output (secondary) circuit.
Installing an MC
in the primary
circuit
Do not turn the magnetic contactor (MC) in the primary circuit on or off
more than once an hour as an inverter failure may result.
If frequent starts or stops are required during motor operation, use terminal
[FWD]/[REV] signals or the RUN/STOP key.
Protecting the
motor
The electronic thermal feature of the inverter can protect the motor. The
operation level and the motor type (general-purpose motor, inverter motor)
should be set. For high-speed motors or water-cooled motors, set a small
value for the thermal time constant.
If you connect the motor thermal relay to the motor with a long wire, a
high-frequency current may flow into the wiring stray capacitance. This
may cause the thermal relay to trip at a current lower than the set value. If
this happens, lower the carrier frequency or use the output circuit filter
(OFL).
Discontinuance of
power-factor
correcting
capacitor
Do not connect power-factor correcting capacitors to the inverter’s primary
circuit. (Use the DC reactor to improve the inverter power factor.) Do not
use power-factor correcting capacitors in the inverter’s output (secondary)
circuit. An overcurrent trip will occur, disabling motor operation.
Discontinuance of
surge killer
Do not connect a surge killer to the inverter's output (secondary) circuit.
Reducing noise
Use of a filter and shielded wires is typically recommended to satisfy EMC
Directive.
Refer to Appendices, App. A "Advantageous Use of Inverters (Notes on
electrical noise)" for details.
Measures against
surge currents
If an overvoltage trip occurs while the inverter is stopped or operated under
light load, it is assumed that the surge current is generated by open/close of
the phase-advancing capacitor in the power system.
* Connect a DC reactor to the inverter.
Combina-
tion with
peripheral
devices
Megger test
When checking the insulation resistance of the inverter, use a 500 V megger
and follow the instructions contained in the FRENIC-Multi Instruction
Manual (INR-SI47-1094-E), Chapter 7, Section 7.5 "Insulation Test."
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