M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation
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Insulation Testing<br />
The M-Max series frequency inverters are tested, delivered<br />
and require no additional testing.<br />
WARNING<br />
On the control signal and the connection terminals of the<br />
frequency inverter, no leakage resistance tests are to be<br />
performed with an insulation tester.<br />
WARNING<br />
Wait at least 5 minutes after switching the supply<br />
voltage off before you disconnect a connection on the<br />
connection terminals (L1, L2/N, L3, U/T1, V/T2, W/T3,<br />
R+, R–) of the frequency inverter.<br />
If insulation testing is required in the power circuit of the<br />
PDS, you must consider the following measures.<br />
Testing the Motor Cable Insulation<br />
Disconnect the motor cable from connection terminals U/T1,<br />
V/T2 and W/T3 of the frequency inverter and from the motor<br />
(U, V, W). Measure the insulation resistance of the motor<br />
cable between the individual phase conductors and between<br />
the phase conductor and the protective conductor.<br />
The insulation resistance must be greater than 1M ohm.<br />
Installation<br />
Testing the Input Cable Insulation<br />
Disconnect the power cable from the input supply network<br />
and from connection terminals L1, L2/N and L3 of the<br />
frequency inverter. Measure the insulation resistance of the<br />
input cable between the individual phase conductors and<br />
between each phase conductor and the protective<br />
conductor.<br />
The insulation resistance must be greater than 1M ohm.<br />
Testing the Motor Insulation<br />
Disconnect the motor cable from the motor (U, V, W) and<br />
open the bridge circuits (star or delta) in the motor terminal<br />
box. Measure the insulation resistance of the individual<br />
motor windings. The measurement voltage must at least<br />
match the rated voltage of the motor but is not to exceed<br />
1000V.<br />
The insulation resistance must be greater than 1M ohm.<br />
Consider the information from the motor manufacturer in<br />
testing the insulation resistance.<br />
M-Max <strong>Series</strong> <strong>Adjustable</strong> <strong>Frequency</strong> <strong>Drive</strong> MN04020003E—April 2011 www.eaton.com 47