6-5
6-1 Inspection and Maintenance
6
Inspection and Maintenance
Measurement Methods of I/O Voltage, Current, and Electric Power
Below are general measurement devices for I/O voltage, current, and electric power.
Measure effective values of fundamental wave for voltage, and all effective values for electric
power.
Display Digital
Operator
Check that the display
is clear.
Check that there are
no missing parts.
Check that the LED
indicators are lit
properly.
3
3
3
Visual
inspection
Normal operation
Display can be
read ⎯⎯
Inspection
part
Inspection
item
Inspection point
Inspection
period
Inspection
method
Criteria
Standard
replacement
period
Meter
Daily
Periodic
*1. The life of the capacitor depends on ambient temperatures. Refer to the product life curve in Appendix-2.
When the capacitor stops operating at the end of the product's life, the Inverter must be replaced.
*2. Clean the Inverter periodically. Accumulated dust in or on the cooling fan or heat sink can cause the Inverter
to overheat.
Power
supply
R/L1
S/L2
T/L3
I
R
IS
IT
ER
ES
ET
W11
W12
R/L1
S/L2
T/L3
U/T1
V/T2
W/T3
IU
IV
IW
EU-V
EV-W
EW-U
W01
W02
U
V
W
Motor
General-purpose Inverter
Measurement
item
Measurement point Measurement device Note
Measurement value
reference
Power
supply
voltage
E
I
Phase-to-phase voltage
between R-S, S-T, and
T-R
(E
R) (ES) (ET)
Moving-iron voltmeter
or
Rectifier voltmeter
Effective
value of
fundamental
wave
Commercial current
(200-V class)
200 to 240 V, 50/60 Hz
(400-V class)
380 to 480 V, 50/60 Hz
Power
supply
current
I
I
Current R, S, T
(IR) (IS) (IT)
Moving iron ammeter
All effective
values
Input
electric
power
W
I
Between R-S, S-T
(W
11) + (W12)
Electrodynamic wattmeter
All effective
values
Two-wattmeter method
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