Mitsubishi FR-F800-E, Instruction Manual

Page: 92 / 143

Inspection item
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
91
5
5.1.4
Checking the inverter and converter modules
 Preparation
• Disconnect the external power supply cables (R/L1, S/L2, T/L3) and motor cables (U, V, W).
• Prepare a tester. (For the resistance measurement, use the 100
Ω 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 the
electric continuity.
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 electric continuity, the measured value is several Ω to
several tens of Ω . If all measured values are almost the same, although these values are not constant depending on the
module type and tester type, the modules are without fault.
 Module device numbers and terminals to be checked
(Assumes the use of an analog meter.)
5.1.5
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 these will cause the inverter surface paint to peel off.
• The display, etc. of the operation panel is vulnerable to detergent and alcohol. Therefore, avoid using them for cleaning.
Tester
polarity
Result
Tester
polarity
Result
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
In
ver
ter 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
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 / −