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6
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Inspection items
6.1.5 Checking the drive unit 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 100 range.)
<Checking method>
Change the polarity of the tester alternately at the drive unit terminals R/L1, S/L2, T/L3, U, V, W, P/+ and N/-, and check for
electric continuity.
<Module device numbers and terminals to be checked>
6.1.6 Cleaning
Always run the drive unit in a clean status.
When cleaning the drive unit, gently wipe dirty areas with a soft cloth immersed in neutral detergent or ethanol.
NOTE
Before measurement, check that the smoothing capacitor is discharged.
At the time of electric discontinuity, the measured value is almost . When there is an instantaneous electric
continuity, due to the smoothing capacitor, the tester may not indicate . At the time of continuity, the measured
value is 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.
Tester
Polarity
Measured
Value
Tester
Polarity
Measured
Value
Converter module
D1
R/L1 P/+ Discontinuity
D4
R/L1 N/- Continuity
P/+ R/L1 Continuity N/- R/L1 Discontinuity
D2
S/L2 P/+ Discontinuity
D5
S/L2 N/- Continuity
P/+ S/L2 Continuity N/- S/L2 Discontinuity
D3
T/L3 P/+ Discontinuity
D6
T/L3 N/- Continuity
P/+ T/L3 Continuity N/- T/L3 Discontinuity
Inverter module
TR1
U P/+ Discontinuity
TR4
U N/- Continuity
P/+ U Continuity N/- U Discontinuity
TR3
V P/+ Discontinuity
TR6
V N/- Continuity
P/+ V Continuity N/- V Discontinuity
TR5
W P/+ Discontinuity
TR2
W N/- Continuity
P/+ W Continuity N/- W Discontinuity
(Assumes the use of an analog meter.)
NOTE
Do not use solvent, such as acetone, benzene, toluene and alcohol, as they will cause the drive unit surface paint to
peel off.
The display, etc. of the operation panel and parameter unit (FR-PU07) are vulnerable to detergent and alcohol.
Therefore, avoid using them for cleaning.
Converter module Inverter module
D1 D2 D3
D4 D5 D6
TR1 TR3 TR5
TR4 TR6 TR2
U
V
W
R/L1
S/L2
T/L3
C
P/+
N/-