Inverter Replacement - Mitsubishi Electric FR-V520-1.5K to 55K Instruction Manual

Precautions for maintenance and
inspection
6.5.8

Inverter replacement

The inverter can be replaced with the control circuit wiring kept connected. Before replacement, remove the screws
in the wiring cover of the inverter.
1) Remove the mounting screws in both ends of the control circuit terminal block.
2) With both hands, pull down the terminal block from behind the control circuit terminals.
3) When installing the terminal block to a new inverter, exercise care not to bend the pins of the control circuit ter-
minal block connector.
CAUTION
Before starting inverter replacement, switch power off, wait for more than 10 minutes, and then check the
voltage with a tester and such to ensure safety.
6.5.9 Measurement of main circuit voltages, currents and powers
! Measurement of voltages and currents
Since the voltages and currents on the inverter power supply and output sides include harmonics, measurement
data depends on the instruments used and circuits measured.
When instruments for commercial frequency are used for measurement, measure the following circuits with the
instruments given on the next page.
3-phase 200V power input
3-phase
power
supply
Instrument
types
CAUTION
Use an FFT to measure the output voltage accurately.
A tester or general measuring instrument cannot measure accurately.
Input voltage
Input current
Inverter
Ar
W11 R
Vr
As
W12
S
Vs
At
W13
T
Vt
P
+
Examples of Measuring Points and Instruments
U Au
W21
Vu
V Av
Vv
Aw
W W22
Vw
N
V
-
97
Output voltage
Output current
To motor
: Moving-iron type
: Electrodynamometer type
: Moving-coil type
: Rectifier type