Checking the Simodrive Power Section

Ohm Checking the Simodrive Power Section
Caution!  It must be assured that power is removed and the DC Bus has drained to a safe level before any connections are removed or checked!

Check out our website for all Siemens and Simodrive products.

After you are sure that the DC Bus has safely discharged , a DVM on the Diode scale can be used to detect if a  short circuit or open exists in the power section.  Readings will vary with module size.

Note:   P600 and M600 are the 600 V DC Bus connections.  U2, V2 and W2 are the motor connections.

• Disconnect the P600, M600 bus bars, U2, V2 and W2 connections.  This isolates the power module from the motor and DC Bus.
• Diode check between P600 and U2, then V2 then W2. There should be continuity with the – lead on P600 and the + lead on U2, V2 or W2.  Readings should be open with the leads reversed.
• Diode check between M600 and U2, V2, W2.  There should be continuity with the + lead on M600 and the – lead on U2, V2 or W2.  Readings should be open with the leads reversed.
• Diode check between P600 and M600.  There should be continuity with the + lead on the M600 and the – lead on P600.  The reading should be open with the leads reversed.
• Diode check between U2, V2 and W2.  All combinations should read open.

Note:  If all readings are open the internal DC Bus fuse is open.  If there is a 0Ω reading, there is a  short in the power circuit.
Note 2: Because of the capacitance in the power circuit, resistance checks will indicate a charging effect.  It is necessary to wait until the measurement has stabilized to determine if it is correct.  If possible, it is best to use a DVM with a diode check.

For more info you can visit our website to see all our Siemens Simodrives or email sales@mroelectric.com.

Updated on May 20, 2019 by Brian Hughes

Joe Kaminski

Joe Kaminski is an industrial automation specialist at MRO Electric. He has a background in industrial engineering and supply chain management. Joe has worked in the automation industry for over 10 years providing support to some of the largest companies in the world. For more info, visit www.mroelectric.com.

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