Ladder diagrams, 3 operating the samms-lv device – Siemens MCC-3298 User Manual

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3 Operating the SAMMS-LV Device

3.6 Ladder Diagrams

3.6.1 Library of Standard Ladder Diagrams

The SAMMS-LV library of more than 70 ladder diagrams covers

standard control circuits and the input and output assignments

for the library. You can use the library with the following starter

types:

across-the-line, non-reversing

across-the-line, reversing

two-speed, two winding

two-speed, one-winding, constant or variable torque

two-speed, one-winding, constant horsepower

reduced-voltage, autotransformer (size 2 through 4)

reduced-voltage, autotransformer (sizes 5 and 6)

full-voltage, part winding

wye-delta, open transition

wye-delta, closed transition

For each starter type, the library includes seven control types:

local two-wire

local three-wire

local three-wire, remote two-wire

Figure 3.2 Ladder symbols used with the SAMMS-LV device (sheet 1)

local two-wire, remote two-wire

local three-wire, remote three-wire

remote two-wire

remote three-wire

SAMMS-LVE has seven preloaded circuits (ladder diagrams)

for use with across-the-line (FVNR) applications. SAMMS-LVX

may be used with any of the circuits.

For details on the library of standard ladder diagrams, refer to

the SAMMS Standard Circuit Manual.

3.6.2 Custom Ladder Diagrams

For special motor control applications not covered by the library

of standard ladders, you can construct custom ladder dia-

grams using the input and output devices and their associated

symbols for the SAMMS-LV device. Siemens personnel can

build these custom ladder diagrams or you can build your own.

You can purchase an optional IBM PC-compatible software

package to develop custom ladder diagrams for special control

applications. The package also includes a library of standard

symbols. The package enables you to reconfigure existing

SAMMS-LV devices to meet changing plant needs. Refer to the

Custom Software Manual for the SAMMS device, Bulletin CP

3291.