N700 Operating Instructions and Parts Manual
15. Maintenance and inspection
152
Inspection cycle
Year
Inspection
Parts
Inspection
item
Inspection
item
Daily
1
2
Inspection methods
Decision standard
Meter
Control
circuit
protection
circuit
Operation
check
(1) Confirm balance
of each output
phase voltage
with inverter
single operation.
(2) Operate
sequence
protection moving
test. And no
abnormality.
O
O
(1)
Measure inverter output
terminal U, V, W phase
voltage.
(2)
Short or open protection
circuit output of inverter.
(1)
Phase voltage
balance 400V class
is within 8V.
(2)
On sequence, to
operate abnormality.
Digital
multimeter
rectification
type voltmeter
Cooling
system
Cooling fan
(1) Is there abnormal
vibration,
abnormal sound?
(2) Is there loosening
of connecting
parts?
O
O
(1) Revolve by hands in
the state of tone-on idle.
(2) By watching.
(1)
Revolving smooth.
(2)
No abnormality.
Display
(1) Is the LED lamp
illuminated?
(2) Cleaning.
O (1)
Lamp indicates lamp on
operator.
(2)
Cleaning with cloth.
(1)
Confirm light.
Display
Meter
Is direction value
Normal?
O
O
Confirm indication value of
board meter.
Satisfy normal
value, control value.
Voltage meter,
current meter
Whole
(1) Is there abnormal
signal, abnormal
sound?
(2) Is there any
abnormal occur?
O
O
(1)
By hearing, feeling,
watching.
(2)
Abnormal odor from
overheat, damage etc.
confirmation.
(1)(2)
No abnormality.
Motor
Insulated
resistance
(1) Megger check
( terminal
collection earth
terminal)
O
(1)
Remove connection to U,V
and W and disconnect
motor wiring.
(1)
To be over 5M ohm.
DC 500V
Megger
Table 15- 1 Daily inspection and regular inspection
(Note) Lifetime of the capacitors depends on the ambient temperature.
Please refer to chapter 15.4 [Capacitor Life Curve].
15.3
Withstand Voltage test
Never perform a withstand voltage test on the inverter.
The inverter main circuit uses semiconductors. Semiconductors can deteriorate when a withstand
voltage test is performed.
