Siemens UL 1066 - Trip Unit Circuitry for ETU745-776; With Breaker Status Sensor (BSS)  and Metering Module

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8 – 7

8.8 Trip unit circuitry for ETU745-776

8.8.1 With Breaker Status Sensor (BSS) 

and metering module

Terminating resistor 120  0.5 W on X8-1 / X8-2, if no external c module

If no metering module and no BSS module is used: 

Direct connection X8 to ETU

- BSS module: Breaker Status Sensor

- c: Bus system for interconnection of circuit breaker components and connection to the fieldbus:

PROFIBUS-DP with COM15

MODBUS with COM16

- ETU: Trip Unit

- S40 signaling switch "ready-to-close"

- S41 signaling switch for spring charge level

- S43 signaling switch 2nd shunt trip F3 or F4

- S44 signaling switch for main contacts OPEN / CLOSE position

- S45 Bell Alarm signaling switch

External Air Core

Sensor Input

External Iron Core

Sensor Input

S43 *)

S45

S40

S44

S41

ETU

*) same installation location as S23

Main Page

Default Chapter3
- Table of Contents3
1 Overview6
- Circuit Breaker6
- Cradle7
2 Labels8
- Circuit Breaker Frame Type Label8
- Type Label Circuit Breaker Frame8
- Frame Designation9
- Trip Unit Designation9
- Rating Plug Label10
- Cradle Type Label10
3 Standard Specifications11
4 Packing and Lifting12
- Unpacking12
- Weights12
- Lifting with a Crane13
- Lifting with a Lifting Bar Assembly14
5 Installation17
- Mounting18
- Connecting the Main Conductors22
  - Application and Configuration of Fused Circuit Breakers24
- Secondary Wiring26
6 Commissioning32
- Preparation of Draw-Out Circuit Breaker32
- Charge the Closing Spring35
- Check List for Commissioning37
- Closing the Circuit Breaker38
- Opening the Circuit Breaker38
- Tripping39
- Reclosing a Circuit Breaker Tripped by the Trip Unit40
- Re-Commissioning after Fused Tripping (Not Applicable for 4-Pole)42
  - Measures42
  - Replacing the Fuses44
- Removing from Service49
- Troubleshooting50
7 Frame Sizes / Dimension Drawings52
- Frame Size II Drawout52
- Frame Size II Fused56
- Frame Size II, Fixed-Mounted Version59
- Frame Size II, Door Cut-Outs60
- Frame Size III, Fixed-Mounted Version61
- Frame Size III Drawout62
- Frame Size III, Fuse Carriage65
- Frame Size III, Door Cut-Outs67
- External Sensor for Neutral Conductor69
- Further Dimension Drawings71
8 Circuit Diagrams72
- Terminal Assignment72
- Auxiliary Switches73
- Signaling Switches74
- Shunt Trip, Undervoltage Trip / Electrical Closing Lockout75
- Closing Coil / Electrical CLOSE76
- Motor-Operated Mechanism77
- Remote Bell Alarm Reset77
- Trip Unit Circuitry for ETU745-77678
9 Electronic Components81
- Trip Units81
- Cubiclebus Modules134
- External Voltage Supply172
- Breaker Data Adapter173
- Handheld Test Device177
10 Reset the Reclosing Lockout and the Bell Alarm182
- Resetting the Bell Alarm182
- Resetting the Bell Alarm with Reclosing Lockout (Optional)183
- Field Installation of a Reclosing Lockout184
  - Removing the Automatic Reset Mechanism185
- Installing the Remote Bell Alarm Reset186
11 Shunt Trip / Closing Coil / Undervoltage Release189
- Overview189
- Installing Shunt Trips, Closing Coils, and Undervoltage Devices190
- Installing Optional Signaling Switches on Shunt Trips, Closing Coils, and Undervoltage Devices191
- Setting Delay Times on Undervoltage Release191
- Field Installation of a Cut-Off Switch for Shunt Trips and Closing Coils192
- Mechanical Function Test194
- Connecting Wires194
- Final Tasks195
- Electrical Function Test195
- Updating the Options Label197
12 Auxiliary and Control Switches198
- Installing Internal Auxiliary Switches S1 - S4199
- Installing the Ready-To-Close Switch S20200
- Trip Signaling Switches201
  - Trip Signaling Switches S13, S24, and S26202
- Control Switches - Connecting Wires203
- Communication Switches203
- Connecting Secondary Wiring203
- Updating the Options Label203
- Mechanism Operated Contacts (MOC)204
13 Motor-Operated Mechanism212
- Installing the Motor Operator212
- Optional Motor Disconnect Switch on the Front Panel214
- Updating the Options Label215
14 Indicators and Operating Elements216
- Limiting Access to OPEN/CLOSE Buttons216
- EMERGENCY OPEN Button218
- Operations Counter219
15 Locking Devices220
- Key Locks220
- Padlocking Provisions235
16 Sealing Covers243
17 Mechanical Interlocks244
- Field Installation of CLOSE / OPEN Buttons Blocking Device245
- Cubicle Door Interlock246
- Interlock to Prevent Racking with Cubicle Door Open249
- Coding between Circuit Breaker and Cradle250
18 Additional Options for the Cradle251
- Shutter251
  - Field Installation252
  - Catalog Numbers258
- Truck Operated Contacts - TOC (Cradle Accessory)259
19 Mechanical Circuit Breaker Interlocking262
- Configurations262
- Installing Interlocking Module269
20 Arc Chute Covers276
- Field Installation276
- Catalog Numbers278
21 Door Sealing Frame279
22 Plexiglas Breaker Cover281
23 Maintenance283
- Preparation for Maintenance284
  - Opening the Circuit Breaker and Discharging the Closing Spring284
  - Removing the Circuit Breaker from the Cradle285
- Changing Front Panel286
  - Removing Front Panel286
  - Reinstalling the Front Panel286
- Checking Arc Chutes287
- Inspection of Arc Chute Covers291
- Checking Contact Erosion292
- Replacing the Circuit Breaker Internal Contact Assemblies293
- Exchanging the Primary Disconnects310
- Cleaning and Greasing the Circuit Breaker314
24 Technical Data316
25 Abbreviations326
26 Glossary330
27 Index332

Siemens UL 1066 - Trip Unit Circuitry for ETU745-776; With Breaker Status Sensor (BSS)  and Metering Module

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