Siemens PC 677B 4.4 Connecting the Equipotential Bonding Circuit

Connecting

4.4 Connecting the Equipotential Bonding Circuit

SIMATIC Panel PC 677B

Operating Instructions (Compact), 06/2008, A5E02217246-01 23

4.4 Connecting the Equipotential Bonding Circuit

A low-resistance ground connection ensures that interference signals generated by external

power supply cables, signal cables or cables to the I/O modules are safely discharged to

ground.

The equipotential bonding connection of the device is located underneath the device and is

identified by the following symbol:

Figure 4-1 Equipotential Bonding

Connecting the Equipotential Bonding Circuit

You require a TORX T20 screwdriver to connect the equipotential bonding conductor.

Steps for connecting the equipotential bonding

(1) Connect the equipotential bonding connection (M4 thread) (1)

on the device (large surface, large-area contact) with the

central grounding point of the control cabinet.

The minimum permissible cross-section is 5 mm2.

Contents

Main Safety Guidelines Safety Guidelines Qualified Personnel Prescribed Usage Table of contents Page Safety 1 Page Delivery 2 2.1 Unpacking and checking the delivery Delivery 2.2 Device identification data 2.2 Device identification data 2.3 Product Documentation Installation / panel-mounting 3 3.1 Mounting depth of the device Installation / panel-mounting 3.2 Permitted mounting positions 3.2 Permitted mounting positions Approval Installation / panel-mounting 3.3 Preparing the mounting cut-out SIMATIC Panel PC 677B Operating Instructions (Compact), 06/2008, A5E02217246-01 11 3.3 Preparing the mounting cut-out The following illustration shows the dimensions for the mounting cut-out. Preparing the mounting cut-out Installation / panel-mounting 3.4 Securing the device with clamps 3.4 Securing the device with clamps Requirement Procedure IP65 degree of protection Installation / panel-mounting 3.5 Securing with screws 3.5 Securing with screws Drill holes in the control unit Installation / panel-mounting 3.5 Securing with screws Drill holes in the mounting unit IP54 degree of protection Page Page Connecting 4.1 Connection elements and operator controls 18 4.1 Connection elements and operator controls Connection and Operator Control Components of the Computer Unit Connecting 4.1 Connection elements and operator controls Connection components of the control unit Connecting 4.2 Connecting the 120 V / 240 V AC power supply 4.2 Connecting the 120 V / 240 V AC power supply Note before connecting the device Connecting 4.2 Connecting the 120 V / 240 V AC power supply Localized information Connecting Connecting 4.3 Connecting the (24 V) DC power supply Power consumption 4.3 Connecting the (24 V) DC power supply Note before connecting the device Connecting Connecting 4.4 Connecting the Equipotential Bonding Circuit 4.4 Connecting the Equipotential Bonding Circuit Connecting the Equipotential Bonding Circuit Page Commissioning 5 5.1 Initial Startup Configuring the operating system Commissioning 5.2 Setting up the language selection Switching off the device 5.2 Setting up the language selection 5.3 Setting the panel type Commissioning 5.4 KeyTools (for key panel devices) 5.4 KeyTools (for key panel devices) Calling up KeyTools 5.5 On-screen keyboard (for touch panel device) Call "Touch input" Page Service and support 6