N700 Operating Instructions and Parts Manual
15. Maintenance and inspection
151
15.2
Daily inspection and regular inspection
Inspection cycle
Year
Inspection
Parts
Inspection
item
Inspection
item
Daily
1
2
Inspection methods
Decision standard
Meter
Surroundings
Check temperature
of surrounding,
humidity, dust.
O
Refer to 2.1 Installing.
Temperature range
is between -10
℃
and 50
℃
.
No dew present and
humidity is below
90%
Thermometer
hygrometer
recorder
Whole
equipment
Is there abnormal
vibration, abnormal
sound?
O
By watching, hearing.
No trouble
Whole
Power
voltage
Is main circuit
voltage normal?
O Measurement
of
inverter
terminal R,S,T phase
voltage
Within alternating
voltage allowable
change.
Tester,digital
multi-meter
Whole
(1) Megger check
Between circuit
terminal and
earth terminal
(2) Are all screws
terminals tight?
(3) Is there any sign
of over - voltage?
(4) cleaning
O
O
O
O
(1)
After you remove
connector J61 from inside
the inverter
Take out the wiring of
input/output of inverter
main circuit terminal and
control terminal, measure
between parts shortened
shortened terminal R, S, T,
U, V, W, P, PD, N, RB and
earth terminal with megger
(2)
Incremental clamping.
(3)
Watch
(1)
To be over 5M ohm.
(2) (3)
No abnormality.
DC500V
class megger
Connection
conductor/
electric line
(1) Is there warp in
conductor?
(2) Is there any
damage of
coating of wires?
O
O
(1) (2)
By watching
(1) (2)
No abnormality
Terminals
Is there any
damage?
O
By
watching.
No
abnormality.
Inverter parts
converter
parts
Resistance check
between each
terminal.
O
Take out connect of
inverter, measure terminal
between R, S, T and P, N
between U, V, W and P, N
with tester x 1 ohm range.
Refer to check
method of
6.5 inverter,
converter parts.
Analog form
tester
Smoothing
capacitor
(1) Is there any
liquid?
(2) Does relief valve
come out? Is
there any swell?
(3) Measure of
allowable static-
electricity.
O
O
O
(1), (2)
By watching.
(3)
Measure with capacity
measure
(1), (2)
No abnormality
(3)
Over 80% of rated
capacity.
Capacity meter
Relay
(1) Is there abnormal
sound in
operation?
(2) Is there damage
to the contacts?
O
O
(1)
By hearing
(2)
By watching
(1), (2)
No abnormality
Main circuit
Resistor
(1) Is there any
crack,
discoloration of
resistance
insulator.
(2) Confirm
existance of
breaking of wire.
O
O
(1)
By watching cementing
resistance. Curl type
resistance. Take out
connection to other side,
measure it with tester.
(1)
No abnormality
Error to be within
10% of Display
resistance.
Tester Digital
multimeter