Chapter 6 – Service and Maintenance
6-6 ACS 501 Installation & Start-up Manual
Figure 6-3 Resistance Test
5. If your readings differ from these resistance values, replace the Rectifier
Module.
DC Bus Capacitor
Tests
The DC Bus Capacitor Tests are divided into groups according to drive
ratings. Each drive rating group requires two separate tests, one for capacitor
resistance, and one for capacitor DC insulation. These tests tells you if your
DC bus capacitors need replacement.
Damaged electrolytic capacitors may withstand 300 V while not operating at
normal power levels. A resistance test, together with a Meggar test for DC
insulation, reveals enough information to determine the condition of
electrolytic capacitors.
When testing DC bus capacitors, always do the Resistance Test and the
Insulation Test.
0.5 V
100 ¾Ω ¾... 10 k ¾Ω
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