Mitsubishi FR-A500 Series - 7.1 Option List

PROTECTIVE FUNCTIONS
197
Daily and Periodic Inspection
Interval
Periodic
Area of
Inspec-
tion
Inspection
Item
Description
Daily
1
year
2
years
Method Crlterlon Instrument
Inverter
module,
Converter
module
Check resistance
across terminals.
"
Disconnect cables
from inverter and
measure across
terminals R, S, T, P,
N and U, V, W, P, N
〈
L
1
, L
2
, L
3
,
+
,
−
and
U, V, W,
+
,
−〉
with a
meter range of 100
Ω
.
(Refer to page
198)
Analog meter
Relay
(1) Check for chatter
during operation.
(2) Check for rough
surface on
contacts.
"
"
(1) Auditory check.
(2) Visual check.
(1) No fault.
(2) No fault.
Main
circuit
Resistor
(1) Check for crack in
resistor insulation.
(2) Check for open
cable.
"
"
(1) Visual check.
Cement resistor,
wire-wound
resistor.
(2) Disconnect one
end and measure
with a meter.
(1) No fault.
(2) Error should
be within
±
10% of
indicated
resistance
value.
Meter, digital
multimeter
Control
circuit
Protec-
tive circuit
Operation
check
(1) Check balance of
output voltages
across phases with
inverter operated
independently.
(2) Perform sequence
protective operation
test to make sure of
no fault in protective
and display circuits.
"
"
(1) Measure voltage
across inverter
output terminals
U-V-W.
(2) Simulatively
connect or
disconnect
inverter protective
circuit output
terminals.
(1) Phase-to-
phase voltage
balance within
4V (8V) for
200V (400V).
(2) Fault must
occur because
of sequence.
Digital
multimeter,
rectifier type
voltmeter
Cooling
system
Cooling fan
(1) Check for unusual
vibration and noise.
(2) Check for loose
connection.
"
"
(1) Turn by hand with
power off.
(2) Re-tighten
No unusual
vibration, unusual
noise.
Display
(1) Check if LED lamp
is blown.
(2) Clean.
"
"
(1) Light indicator
lamps on panel.
(2) Clean with rag.
(1) Check that
lamps are lit.
Display
Meter
Check that reading is
normal.
"
Check reading of
meters on panel.
Must satisfy
specified and
management
values.
Voltmeter,
ammeter, etc.
General
(1) Check for unusual
vibration and noise.
(2) Check for unusual
odor.
"
"
(1) Auditory, sensory,
visual checks.
(2) Check for unusual
odor due to
overheating,
damage, etc.
(1), (2) No fault.
Motor
Insulation
resistance
(1) Check with megger
(across terminals
and ground
terminal).
"
(1) Disconnect cables
from U, V, W,
including motor
cables.
(1) 5M
Ω
or more
500V megger
Note: The value for the 400V class is indicated in the parentheses.
5