Continuity Test; Cleaning; Checking Method; Device Number And Target Terminal - Mitsubishi Electric FR-XC-18.5K-PWM Instruction Manual

Inspection item
5.1.4

Continuity test

Preparation
• Disconnect the external power cables from terminals R2/L12, S2/L22, T2/L32, P/+, and N/-.
• Prepare a continuity tester. (For the resistance measurement, use the 100 Ω range.)
Checking method
Change the polarity of the tester alternately at a semiconductor device (transistor) on an electrical path between two
terminals among the converter main circuit terminals R2/L12, S2/L22, T2/L32, P/+, and N/- to 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. When all measured values are almost the same (although values may not be constant depending on the
tester type), it shows that there are no electrical paths with problems.
Device number and target terminal
Tester polarity
Device No.
R2/L12
TR1
P/+ R2/L12
S2/L22
TR2
P/+ S2/L22
T2/L32
TR3
P/+ T2/L32
R2/L12
TR4
N/- R2/L12
S2/L22
TR5
N/- S2/L22
T2/L32
TR6
N/- T2/L32
(Assuming that an analog meter is used.)
5.1.5

Cleaning

Always run the converter in a clean state.
When cleaning the converter, gently wipe dirty areas with a soft cloth immersed in neutral detergent.
NOTE
• Do not use solvent, such as acetone, benzene, toluene and alcohol, as these will cause the converter surface paint to peel
off.
As the display on the converter or the parameter unit, etc. are vulnerable to detergent and alcohol, avoid using them for
cleaning.
148
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Continuity
P/+ No
Yes
P/+ No
Yes
P/+ No
Yes
N/- Yes
No
N/- Yes
No
N/- Yes
No
TR1 TR2
R2/L12
S2/L22
T2/L32
TR4 TR5
P/+
TR3
C
TR6
N/-