Basic cabinet, Mechanical design, Electrical design

SIMATIC PCS 7 cabinet design

Basic cabinet

■Overview

The Siemens standard cabinet 8MC is the preferred basic cabi- net. The Siemens standard cabinet 8MC is a sheet-steel cabinet with rear panel and front door which can be assembled individ- ually or also in rows with further cabinets of this type.

Side walls and partitions are optional, thus permitting variable adaptation of the cabinet to different installation possibilities.

Up to four system units or six I/O units can be fitted in a cabinet in conjunction with a DC 24 V or AC 230 V power supply assem- bly. System and I/O units can also be combined together within a cabinet. The cables are introduced into the cabinet from be- low.

Mechanical design

Each delivered cabinet contains:

•19-inch mounting frame

•Rear panel

•Door

•Transport lugs

•Clips for routing of process cables

•Cable duct for cabinet-internal wiring

Options for the mechanical design

When ordering the basic cabinet, the following options are avail- able for the mechanical design of the cabinet:

•Plinth: a cabinet plinth should be used if cables cannot be con- nected through the floor. The plinths are preassembled, and available with a height of 100 or 200 mm

•Pocket for documents

•Trim

•Side walls/partitions: the basic cabinets are suitable for individ- ual assembly or in rows. Therefore side walls and/or partitions can be selected when ordering.

Electrical design

Each delivered cabinet contains:

•Power supply assembly AC 230 V or DC 24 V

•Cable clamps and screen bars for I/O and bus cables

•Prewiring of power supply cables for central and I/O units

•Wiring of PROFIBUS-DP fieldbus

•Connector board for cabinet earth

Options for the electrical design

•AC 230 V socket (installed in power supply assembly)

•I & C monitoring (2 versions):

-I & C monitoring via cabinet lamp. A blown fuse is signalled by a lamp in the cabinet door. OLM failure can be additionally displayed on the cabinet lamp

-I & C monitoring via AS 488/TM and cabinet lamp. Tempera- ture violations in the cabinet, an open door contact, a blown fuse and an OLM failure can be recorded by the IF 961-DIO interface module and additionally signalled by a lamp in the cabinet door

-Single/redundant design of power supply assembly, option- ally with 6 or 14 circuit-breaker receptacles

•Cabinet illumination

Preparation of quotation, consulting and ordering

Siemens AG

D-76187 Karlsruhe

Tel.: +49 721 595-3776

Fax: +49 721 595-4711

E-mail: helmut.heib@siemens.com

■Technical Specifications

Siemens standard cabinet

Dimensions (H x W x D) in mm	2000 x 800 x 400
Framework, completely welded	Sheet-steel, 2 mm,
	frame profile with 10 edges,
	cross-member profile with 5
	edges

Rear panel	Sheet-steel, 1.5 mm, canted

Roof	Sheet-steel, 1.5 mm, canted

Side wall (option)	Sheet-steel, 1.5 mm, canted

Partition (option)	Sheet-steel, 1.5 mm, canted

Single-leaf door on front of cabinet	Sheet-steel, 1.5 mm,
with hinge on right	opening angle approx. 180°;
	including rod lock with 3 mm lock
	insert and double-barb key
	DIN 43 668

Degree of protection to EN 60 529	IP 40, with single installation or
	together with cabinets of the
	same type

Color	Ergo gray to
	SN 30 920-C611-B13

Permissible ambient temperature	Max. 40 °C

Permissible temperature inside	Max. 55 °C
cabinet

Permissible heat dissipation with-	350 W, referred to maximum val-
out fan	ues of ambient temperature and
	temperature inside cabinet

Siemens PLT 112 · 2002

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