Read and follow safety information in Section 6.02 before proceeding.
IGBT Testing Multimeter Lead Placement Diode Voltage
IGBT T3 &T4
Positive meter lead to testpoint 4
Negative meter lead to testpoint 1
0.2 – 0.8 VDC
IGBT T5 & T6
Positive meter lead to testpoint 3
Negative meter lead to testpoint 5
0.2 – 0.8 VDC
Table 6-3: IGBT’s, Multimeter set to measure Diode Voltage
IGBT Testing Multimeter Lead Placement Ohms
IGBT T3 & T4 Positive meter lead to testpoint 1
Negative meter lead to testpoint 4
>150 Ω
IGBT T5 & T6 Positive meter lead to testpoint 5
Negative meter lead to testpoint 3
>150 Ω
Table 6-4: IGBT’s, Multimeter set to measure ohms (Ω)
Inrush PTC Multimeter Lead Placement Ohms
PTC Positive meter lead to testpoint 6
Negative meter lead to testpoint 7
0 to 100 Ω
Table 6-5: Inrush PTC, Multimeter set to measure ohms (Ω)
6.07 Check main input rectifier
Input Rectifier Testing Multimeter Lead Placement Diode Voltage
AC1 to DC+ Positive meter lead to testpoint 8
Negative meter lead to testpoint 9
0.2 – 0.8 VDC
AC2 to DC+ Positive meter lead to testpoint 10
Negative meter lead to testpoint 9
0.2 – 0.8 VDC
AC1 to DC- Positive meter lead to testpoint 11
Negative meter lead to testpoint 8
0.2 – 0.8 VDC
AC2 to DC- Positive meter lead to testpoint 11
Negative meter lead to testpoint 10
0.2 – 0.8 VDC
Table 6-6: Input Rectifier, Multimeter set to measure Diode Voltage
6.08 DC Bus voltage measurement
Apply voltage to the Power Source.
WARNING
There are extremely dangerous voltage and power levels present inside these Power Sources. Do not
attempt to diagnose or repair unless you have had training in power electronics measurement and
troubleshooting techniques.
Once power is applied to the Power Source, there are extremely hazardous voltage and power levels present.
Do not touch any live parts.
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