Preparations For Parallel Drive Systems; Access To Testing Connection Points - Danfoss VLT FC Series Service Manual

Test Procedures

8.3.1 Preparations for Parallel Drive Systems

When testing parallel drive systems, observe the following
practices.
•
To access the DC link, use the regen terminals at
the top of the module. All parallel drive modules
have regen terminals. See Illustration 8.2.
•
When testing the entire system, it is not
necessary to remove the interlink connections
between the DC links, input terminals, and output
terminals.
•
When testing an individual module within a
parallel system, isolate the module by removing
the interlink connections and the control cable
connections of the module.
•
For information on testing an individual module
after repair, and before placing it back into the
parallel system, refer to chapter 8.6.2 After-repair
8 8
Tests for Parallel Drive Systems.
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VLT FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9

8.3.2 Access to Testing Connection Points

Many of the following test procedures require access to
the DC bus. For the DC bus location in D1h–D8h units, see
Illustration 8.1. For parallel drive systems, see Illustration 8.2.
For E1h–E4h drives, see Illustration 8.3.
NOTICE
DC BUS LOCATION
To reach the DC bus location in D1h–D8h units, use a
voltmeter with safety probe tip extenders.
1 DC(+) bus
2 DC(-) bus
Fasteners are M5 studs.
Illustration 8.1 DC Bus Location in D1h–D8h Drives
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MG94A502