Mitsubishi Electric FR-F500 Series Instruction Manual page 195

Area of
Inspection
Inspec-
Item
tion
Inverter
module, Check resistance
Converter across terminals.
module
(1) Check for chatter
Main
during operation.
circuit
Relay (2) Check for rough
surface on
contacts.
(1) Check for crack in
resistor insulation.
(2) Check for open
Resistor cable.
(1) Check balance of
output voltages
across phases
with inverter
operated
Control independently.
circuit Operation (2) Perform
Protec- check sequence
tive circuit protective
operation test to
make sure of no
fault in protective
and display
circuits.
(1) Check for unusual
vibration and
Cooling
Cooling fan noise.
system
(2) Check for loose
connection.
(1) Check if LED
Display lamp is blown.
(2) Clean.
Display
Check that reading is
Meter
normal.
(1) Check for unusual
vibration and
noise.
General
(2) Check for unusual
odor.
Motor
Check with megger
Insulation (across terminals and
resistance earth (ground)
terminal).
Note: Values in parentheses are those of the 400V class.
*For periodic inspection, consult Mitsubishi.
Interval
Periodic*
Description
Daily
1
year
$
$
$
$
$
$
$
$
$
$
$
$
$
PROTECTIVE FUNCTIONS
Method
2
years
Disconnect cables
from inverter and
measure across
terminals R, S, T, ↔
P, N and U, V, W, ↔
$
(Refer to page 182)
P, N 〈L ↔ +, −
, L , L
1 2 3
and U, V, W, ↔ +, −〉
with a meter range of
100Ω.
(1) Auditory check. (1) No fault.
(2) Visual check. (2) No fault.
(1) Visual check. (1) No fault.
Cement resistor, (2) Error should be
wire-wound
resistor.
(2) Disconnect one
end and measure
with a meter.
(1) Measure voltage (1) Phase-to-phase
across inverter
output terminals
U-V-W.
(2) Simulatively (2) Fault must
connect or
disconnect
inverter protective
circuit output
terminals.
(1) Turn by hand with
power off. No unusual
(2) Visual check vibration, unusual
noise.
(1) Light indicator (1) Check that
lamps on panel.
(2) Clean with rag.
Must satisfy
Check reading of specified and
meters on panel. management
values.
(1) Auditory, sensory,
visual checks.
(2) Check for unusual
(1), (2) No fault.
odor due to
overheating,
damage, etc.
Disconnect cables
from U, V, W,
5M Ω or more
$
including motor
cables.
181
Crlterlon Instrument
Analog meter
within ±10% of
Meter, digital
indicated
multimeter
resistance
value.
voltage balance
within 4V(8V)
for 200V(400V).
occur because Digital
of sequence. multimeter,
rectifier type
voltmeter
lamps are lit.
Voltmeter,
ammeter, etc.
500V megger
5