Standard Commissioning Process 29
Converter Insulaiton Test
Required tools and accessories
• 5 mm hex-head key
• Multi meter
• Test leads for short-circuiting the terminals
• 5 kV insulation tester (megger)
Procedure
Note: The terminals and components referred to in the following section correspond to
those in the Figure Overview of high voltage part short circuit wiring.
1. Switch off the main and auxiliary power supply and ground the equipment.
2. Switch off all the breakers and fuses in the Control unit.
3. Disconnect +24V power supply plug of all control board (BCON, CVMI2, IO controller,
Control hub, etc.).
4. Disconnect the arresters from the input bus bars.
5. Disconnect HVR boards from medium voltage side.
6. Short-circuit all inputs, outputs bus bars, and connect them to each other.
7. Short circuit all the PMs three phase inputs, outputs and housings, connect them to
the high voltage circuit.
8. Short-circuit all isolation switches QS1(Q1), QS2(Q2) and QS3(Q3) of Manual bypass
cabinet (if MBU=0001).
9.
Short-circuit all contactors KM1(Q1), KM2(Q2) and KM3(Q3) of Auto bypass cabinet (if
MBU=0002 or MBU=0003).
10. Short -X107:1,2; -X108:1,2. Note terminal 2 was grounded already (if SBU=0001 &
SBP=0001).
11. Switch off PT power supply from customer side, disconnect PT (-X107:1,2,PE; -
X108:1,2,PE; -X109:1,2,PE if available), if SBU=0001 & SBP=0000.
12. Perform the insulation test between the main circuit and ground.
• Test voltage: 5 kV for 60 seconds
• Duration: 60 seconds
• The insulation resistance value must >500MΩ in below test condition:
a. Ambient temperature in the range of 0 °C to 40 °C
b. Relative Humidity <70%
NOTICE Drive insulation test is not mandatory, it shall be applied or recommended only
if:
• Long storage time of the drive (such as >6 months).
• Humid environment (Respectively humid storage condition).
• Visual inspection shows any transportation/installation damages.
• Always on customer request.
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