Display Of The Life Of The Inverter Parts; Checking The Inverter And Converter Modules; Cleaning - Mitsubishi Electric 700 Series Instruction Manual

Inspection items
7.1.4

Display of the life of the inverter parts

The self-diagnostic alarm is output when the life span of the control circuit capacitor, cooling fan and each parts of the inrush
current limit circuit is near its end. It gives an indication of replacement time.
The life alarm output can be used as a guideline for life judgment.
Parts
Main circuit capacitor
Control circuit capacitor
Inrush current limit circuit
Cooling fan
POINT
Refer to page 177 to perform the life check of the inverter parts.
7.1.5

Checking the inverter and converter modules

<Preparation>
(1) Disconnect the external power supply cables (R/L1, S/L2, T/L3) and motor cables (U, V, W).
(2) Prepare a tester. (Use 100Ω range.)
<Checking method>
Change the polarity of the tester alternately at the inverter terminals R/L1, S/L2, T/L3, U, V, W, P/+ and N/-, and check for
electric continuity.
NOTE
1. Before measurement, check that the smoothing capacitor is discharged.
2. At the time of electric discontinuity, the measured value is almost
to the smoothing capacitor, the tester may not indicate
several to several tens-of ohms depending on the module type, circuit tester type, etc. If all measured values are
almost the same, the modules are without fault.
<Module device numbers and terminals to be checked>
Tester Polarity
+
R/L1 Discontinuity
D1
+
R/L1 Continuity
+
S/L2 Discontinuity
D2
+
S/L2 Continuity
+
T/L3 Discontinuity
D3
+
T/L3 Continuity
+
U Discontinuity
TR1
+
U Continuity
+
V Discontinuity
TR3
+
V Continuity
+
W Discontinuity
TR5
+
W Continuity
(Assumes the use of an analog meter.)
7.1.6

Cleaning

Always run the inverter in a clean status.
When cleaning the inverter, gently wipe dirty areas with a soft cloth immersed in neutral detergent or ethanol.
NOTE
Do not use solvent, such as acetone, benzene, toluene and alcohol, as they will cause the inverter surface paint to peel off.
The display, etc. of the operation panel are vulnerable to detergent and alcohol. Therefore, avoid using them for
cleaning.
214
Judgment Level
85% of the initial capacity
Estimated remaining life 10%
Estimated remaining life 10%
(Power on: 100,000 times left)
Less than 50% of the predetermined speed
Tester Polarity
Measured
Value
−
R/L1
D4
−
R/L1 Discontinuity
−
S/L2
D5
−
S/L2 Discontinuity
−
T/L3
D6
−
T/L3 Discontinuity
−
U
TR4
−
U
−
V
TR6
−
V
−
W
TR2
−
W
∞
. When there is an instantaneous continuity, due
∞
. At the time of electric continuity, the measured value is
Measured
Value
Converter module
Continuity
D1 D2
Continuity
R/L1
Continuity
S/L2
Continuity
T/L3
Discontinuity
Continuity
Discontinuity
D4 D5
Continuity
Discontinuity
P/+
Inverter module
TR1 TR3
D3
C
D6
TR4 TR6
N/−
TR5
U
V
W
TR2