Fc17: Star-Delta - Star-Delta Changeover - Siemens SINUMERIK 840D sl Function Manual

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Call example

// DB with the name strdat is declared in symbol table, data element disp is declared as

String[32] (in HT 2:

// String[64]) and completely assigned with characters

StringAddr := MW 30,

FC17: Star-delta - star-delta changeover

Block FC17 is used for star-delta changeover for digital main spindle drives. The changeover

can be made in both directions (star > delta or delta > star).

Prerequisite

The prerequisite is two isolated contactors. The contactors are controlled via the peripheral

output signals configured at the FC17 outputs: "Y" or "Delta".

Internal sequence

The internal sequence when changing over between star and delta after switching over the

FC17 control signal is described in the following: "YDelta" displayed.

1. DB31, ... .DBX21.5 = 0 (reset feedback signal "motor selected")

DB31, ... .DBX21.x = 1 (set request "2nd motor data set" corresponding to the interface

parameterization DB31, ... .DBX130.0 - 4 (Page 65))

2. DB31, ... .DBX93.7 == 0 (feedback signal "pulses enabled" was reset) ⇒

– Start FC17 timer

– FC17: "Y" = 0 (reset output for star contactor)

3. After the FC17 timer elapses (FC17: "TimeVal") ⇒

– FC17: "Y" = 1 (set output for delta contactor)

4. After the FC17 timer elapses again (FC17: "TimeVal") ⇒

– The pulses are again internally set

– DB31, ... .DBX93.7 == 1 (feedback signal "pulses enabled" was set) ⇒

– DB31, ... .DBX21.5 = 0 (feedback signal "motor selected" was set)

Basic Functions

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

"strdat".disp,

// Number to be converted

// Data type of the variables

// 3 decimal places

P3: Basic PLC program for SINUMERIK 840D sl

13.17 Block descriptions

Sinumerik 828d Sinumerik 840de sl