Mitsubishi FREQROL-U100 User Manual

(2)
Leakage
current
across
the line
The
harmonics
of leakage
current
which flows
through
stray
capacity
across
the
inverter output lines
may
cause an external
thermal
overload protector trip.
When the cable length is long (50m or more), the
ratio
of leakage
current
to the
motor's
rated
current
becomes large.
and
trip
is liable to occur.
• Countermeasures
• Use the electronic
thermal
relay on the inverter.
• Lower the
carrier
frequency.
Note
that
this will increase
the
motor
noise.
NFB
The~al
relay
M~r
power~
Inverter
.)
,
SUPPIC""O-
'
_
....
Capacitance
T
between
wires ':'
Routa of leakage current between wires
Against
the
trip
due to leakage current, the preferred method of
motor
overload
protection is a
thermistor
protection with
temperature
detectors in the
motor
or
motor
protection switch with bi-metal release, etc.
-44-

Mitsubishi FREQROL-U100 Specifications

General

Brand	Mitsubishi
Model	FREQROL-U100
Category	Inverter
Language	English