Mitsubishi Electric FR-A500 Instruction Manual page 217

Area of
Inspec-
Inspec-
tion Item
tion
Terminal
Check for damage.
block
Inverter
module, Check resistance
Converter across terminals.
module
Main
(1) Check for chatter
circuit
during operation.
Relay (2) Check for rough
surface on
contacts.
(1) Check for crack in
resistor insulation.
(2) Check for break in
the cable.
Resistor
(1) Check balance of
output voltages
across phases with
Control
inverter operated
circuit
alone.
Operation
Protec- (2) Perform sequence
check
protective
tive
operation test to
circuit
ensure no fault in
protective and
display circuits.
(1) Check for unusual
Cooling Cooling vibration and noise.
system fan (2) Check for loose
connection.
(1) Check for LED
lamp blown.
Display
(2) Clean.
Display
Check that reading is
normal.
Meter
(1) Check for unusual
vibration and noise.
(2) Check for unusual
odor.
General
Motor
(1) Check with megger
Insulation (across terminals
resistance and earth (ground)
terminal).
Note: Values in parentheses indicate those for 400V class.
*Consult us for periodic inspection.
Interval
Description
Daily
year
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Periodic
Method
1 2
year
Visual check.
Disconnect all
cables from the
inverter and
measure across
terminals R, S, T,
P, N and U, V, W,
P, N <L , L , L , +,
1 2 3
- and U, V, W, +, ->
with a meter range
of 100 .
(1) Auditory check.
(2) Visual check.
(1) Visual check.
Cement
resistor, wire-
wound resistor.
(2) Disconnect one
end and
measure with a
meter.
(1) Measure
voltage across
inverter output
terminals U-V-
W.
(2) Simulatively
short or open
the protective
circuit output
terminals of the
inverter.
(1) Turn by hand
with power off.
(2) Visual check.
(1) Lamps indicate
indicator lamps
on panel.
(2) Clean with rag.
Check the
readings of meters
on the panel.
(1) Auditory,
sensory, visual
checks.
(2) Check for
unusual odor
due to
overheating,
damage, etc.
(1) Disconnect
cables from U,
V, W, including
motor cables.
208
Criterion Instrument
No fault
(Refer to page Analog
209) tester
(1) No fault.
(2) No fault.
(1) No fault.
(2) Error should
be within ±10%
Meter,
of indicated
digital
resistance
multimeter
value.
(1) Phase-to-
phase voltage
balance within
4V (8V) for
Digital
200V (400V).
multimeter,
(2) Fault must
rectifier type
occur because
voltmeter
of sequence.
No unusual
vibration, unusual
noise.
(1) Check that
lamps are lit.
Must satisfy
Voltmeter,
specified and
ammeter,
management
etc.
values.
(1), (2) No fault.
(1) 5M or more
500V
megger
Cus-
tomers
check