Checking The Inverter And Converter Modules; Cleaning - Mitsubishi Electric FR-F700 Series Instruction Manual

6.1.5

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 continuity.
CAUTION
1. Before measurement, check that the smoothing capacitor is discharged.
2. At the time of discontinuity, due to the smothing capacitor, the tester may not indicate ∞. At the time of continuity, the
measured value is several to several ten's-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
Measured
Polarity
Value
R/L1 P/+ Discontinuity
D1
P/+ R/L1 Continuity
S/L2 P/+ Discontinuity
D2
P/+ S/L2 Continuity
T/L3 P/+ Discontinuity
D3
P/+ T/L3 Continuity
U P/+ Discontinuity
TR1
P/+ U Continuity
V P/+ Discontinuity
TR3
P/+ V Continuity
W P/+ Discontinuity
TR5
P/+ W Continuity
(Assumes the use of an analog meter.)
6.1.6

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.
CAUTION
Do not use solvent, such as acetone, benzene, toluene and alcohol, as they will cause the inverter surface paint to peel off.
Tester
Measured
Polarity
Value
R/L1 N/− Continuity
D4
N/− R/L1 Discontinuity
S/L2 N/− Continuity
D5
N/− S/L2 Discontinuity
T/L3 N/− Continuity
D6
N/− T/L3 Discontinuity
U N/− Continuity
TR4
N/− U Discontinuity
V N/− Continuity
TR6
N/− V Discontinuity
W N/− Continuity
TR2
N/− W Discontinuity
P/+
Converter module
D1 D2 D3
R/L1
C
S/L2
T/L3
D4 D5 D6
N/−
Inspection Item
Inverter module
TR1 TR3 TR5
U
V
W
TR4 TR6 TR2
83
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