Mitsubishi Electric FREQROL HC Instruction Manual page 58

Area of
Inspection
Inspec-
Item
tion
Surrounding Check ambient temperature,
environment humidity, dust, dirt, etc.
General
Check for unusual vibration
Overall unit
and noise.
Power
Check that main circuit
supply
voltage is normal.
voltage
(1) Check with megger
(across main circuit
terminals and ground
terminal).
(2) Check for loose screws
General
and bolts.
(3) Check for overheat on
each part.
(4) Clean.
(1) Check conductors for
distortion.
Conductors,
(2) Check cable sheaths
cables
for breakage.
(3) Check for discoloration.
Terminal
Check for damage.
block
Main
Converter Check resistance across
circuit
module terminals.
(1) Check for liquid leakage.
(2) Check for safety valve
Smoothing
projection and bulge.
capacitor
(3) Measure
capacity.
(1) Check for chatter during
operation.
Relay
(2) Check for rough surface
on contacts.
(1) Check
resistor insulation.
(2) Check for open cable.
Resistor
(1) Ch eck for u nus ua l
Cooling vibration and noise.
Cooling fan
system (2) Ch eck
connection.
(1) Check for power lamp
Display blown.
(2) Clean.
Display
Check that reading is
Meter
normal.
Note:Values for the 400V class are indicated in parentheses.
Daily and Periodic Inspection
Interval
Periodic
Description
Daily
1
year
!
!
!
!
!
!
!
!
!
!
!
!
electrostatic
!
!
!
for crack in
!
!
!
for l oose
!
!
!
Method
2
years
See note on page 13.
V is u a l a n d a udi t o r y
checks.
Measure voltage across
hi gh power factor
converter terminals R, S,
T-P4, S4, T4.
!
(1) Disconnect all cables
from high power factor
converter and measure
across terminals R4,
S4, T4, P , N and
ground terminal with
megger.
(2) Retighten.
(3) Visual check.
(1), (2) Visual check.
Visual check
Disconnect cables from
converter and measure
!
across terminals R4, S4,
Ω
T4 P , N with tester ×1
range.
(1), (2) Visual check.
(3) Measure with capac-
ity meter.
(1) Auditory check.
(2) Visual check.
(1) Visual check. Cement
resistor, wirewound
resistor.
(2) Disconnect one end
and measure with
tester.
(1) Turn by hand with
power off.
(2) Retighten.
(1) Lamps indicate
indicator lamps on
panel.
(2) Clean with rag.
Check reading of meters
on panel.
- 47 -
Criterion Instrument
Ambient temperature:
-10°C to +50°C, non- Thermometer,
freezing. hygrometer,
recorder
Ambient humidity: 90%
or less, non-condensing.
No fault.
170 to 242V
Tester, digital
(323 to 506V) 50Hz
multimeter
170 to 253V
(323 to 506V) 60Hz
Ω
500VDC class
(1) 5M or more.
megger
(2), (3) No fault.
(1), (2) No fault.
No fault
(See the next page.) Analog tester
(1), (2) No fault.
Capacity
(3) 85% or more of
meter
rated capacity.
(1) No fault.
(2) No fault.
(1) No fault.
(2) Error should be
Tester, digital
within ±10%
multimeter
of indicated
resistance value.
(1) Smooth rotation.
(2) No fault.
(1) Check that lamps
are lit.
Must satisfy specified Voltmeter,
and management values. ammeter, etc.
Customer
setting